Catherine Metayer MD, PhD

• Adjunct Professor, Epidemiology and Biostatistics

https://publichealth.berkeley.edu/people/catherine-metayer/

Effect of six-food elimination diet on clinical and histologic outcomes in eosinophilic esophagitis pacific pain treatment victoria bc buy generic toradol 10 mg on-line. Elemental diet is an effective treatment for eosinophilic esophagitis in children and adolescents pain medication for dogs dosage order 10 mg toradol otc. A randomized pain treatment winnipeg 10 mg toradol purchase, double-blind pacific pain treatment center victoria order 10 mg toradol with mastercard, placebo-controlled trial of fluticasone propionate for pediatric eosinophilic esophagitis pain treatment and wellness center pittsburgh buy toradol. Oral viscous budesonide: a potential new therapy for eosinophilic esophagitis in children. Analysis of symptoms and endoscopic findings in 117 patients with histological diagnoses of eosinophilic esophagitis. Dissociation between symptoms and histological severity in pediatric eosinophilic esophagitis. Esophageal dilation in eosinophilic esophagitis: effectiveness, safety, and impact on the underlying inflammation. The overall management of these patients often includes surgical airway intervention. We have found that minimizing the risk of operative failure can best be achieved through the collaborative efforts of a well-coordinated interdisciplinary team. Thorough clinical and operative examinations should be performed, with involved health professionals being aware of conditions and risk factors that can significantly impact clinical outcomes. This article presents an overview of the critical aspects of otolaryngologic management of this complex patient population in the context of the collaborative model used at our institutions. We briefly discuss the initial assessment, mitigating factors that can affect airway reconstruction, and perioperative management of specific airway pathology. Microlaryngoscopy and rigid bronchoscopy are performed with the primary goal of identifying anatomic levels of airway obstruction from the larynx to the carina. The supraglottis is evaluated with attention given to the possibility of supraglottic obstruction, such as laryngomalacia and supraglottic stenosis. The vocal fold level is then evaluated for posterior glottic stenosis, anterior glottic web, and laryngeal cleft. It should be noted that the posterior glottis is an area that is suboptimally evaluated by flexible bronchoscopy. Rigid bronchoscopy is performed using a combination of Hopkins rod telescopes and rigid bronchoscopes. In addition, the length of stenosis and the proximity to the vocal folds is assessed and documented. If a tracheotomy is in place, attention is paid to the evaluation of the suprastomal area, considering the possibility of suprastomal collapse, granuloma, intratracheal skin tract, and a high tracheotomy. The entire airway should also be evaluated for the presence of inflammation because operating on an inflamed airway has a far lower success rate. Common signs of airway inflammation include cobblestoning of the mucosa of the laryngeal surface of the epiglottis, eversion of the laryngeal Operative Assessment the interdisciplinary team performs the operative evaluation, with input from each physician being crucial. Each component of this endoscopic evaluation is aimed at identifying possible pathology2 and risk factors that can affect the success of airway reconstruction. It facilitates identification of areas that can cause airway obstruction and that may be underappreciated or missed with a rigid bronchoscope. In view of these problems, surgical intervention is generally an essential component of overall management, and input from an interdisciplinary team of pediatric subspecialists prior to surgery is crucial. Optimizing health status before surgery by addressing comorbidities such as eosinophilic esophagitis, gastroesophageal reflux disease, obstructive sleep apnea, and pulmonary disease can be vital to the success of surgery, as can appropriate patient selection. In addition, the importance of mitigating factors such as bacterial colonization should not be overlooked. Our chapter describes key aspects of overall assessment and management of this complex patient population in the context of an interdisciplinary collaborative model. We also briefly discuss the perioperative otolaryngologic management of specific airway pathology seen in our clinical practices. Inflammation in the laryngotracheal complex can be caused by conditions of the upper gastrointestinal tract, resulting in an "active". Laryngeal inflammation may resolve with appropriate treatment of the underlying condition, permitting surgical reconstruction with a lower risk of complication. If there is a suspicion of ongoing aspiration, if surgery will involve the glottis, or if surgery will repair a stenosis that may be preventing aspiration, then a swallowing evaluation should be pursued. These complimentary evaluations can assess ongoing aspiration with swallowing, as well as the likelihood of future aspiration. Another evaluation that may be useful in children who have a tracheotomy is dye testing. Through the use of green food coloring, aspiration in general, as well as specific causes of aspiration, can be assessed as follows: dye can be placed on the tongue to evaluate aspiration of saliva or secretions; a particular consistency of food can be dyed to assess for consistency-specific aspiration; and gastrostomy tube feeds can be dyed to assess aspiration of refluxed feeds. Aspiration is suspected if stained secretions or feeds are noted from the tracheotomy during feeding or at any time after feeding. Information obtained from a swallowing evaluation becomes crucial in planning the operative procedure and in counseling the family about the potential risk of aspiration. Because many airway reconstructive procedures involve a compromise between voice quality and airway improvement, preoperative voice evaluation has become increasingly important. In some cases, operative planning can be modified to offer a better balance between long-term voice and airway concerns. When vocal fold immobility is noted on the voice evaluation, the surgeon should search for the specific etiology of the immobility, as various conditions may appear similar on voice evaluation but may be treated differently. Counseling families about the impact of airway surgery on future voice quality and the options of voice therapy is also an important part of the overall process. A new indication for structural airway surgery is voice improvement rather than just airway improvement. Patients who are found to be positive are treated with perioperative and postoperative antibiotic therapy (Table 79. In our collective experience, this protocol decreases the risk of infection-related morbidity. This broad classification of pathology encompasses numerous diseases that affect the upper and lower respiratory systems, including unrecognized but significant aspiration, bronchopulmonary dysplasia, tracheomalacia, bronchomalacia, cystic fibrosis, and reactive airway disease. Collaboration with a pediatric pulmonologist is important not only in the diagnosis but also in both the short- and long-term management of these patients. When significant pulmonary disease is identified, it is crucial that surgery be delayed until it is treated. Many patients who have EoE also have esophageal, laryngotracheal, and sinonasal complaints; however, some patients are asymptomatic. Surgery in the presence of active EoE often elicits a brisk inflammatory response that can lead to graft failure and/or restenosis. If EoE is present, the authors recommend medical management followed by repeat endoscopy with biopsies. Although the goal of creating an anatomically normal airway at the site of reconstruction may be achieved from a technical perspective, if a child remains dependent on a tracheotomy because of oxygen or ventilation requirements or suffers from chronic aspiration, then in a more global sense the operation has failed. A tracheotomy is not benign, and tracheotomy-related death or neurologic damage remains a risk for tracheotomy-dependent children. In a small number of cases the primary goal is not decannulation or avoidance of a tracheotomy. Alternatively, the goal may be to create a safer airway in the event of accidental decannulation, to improve or restore voice, or to decrease aspiration events. Because of the potential impact of this condition on postoperative healing, the authors routinely administer prophylactic preoperative and postoperative therapy to patients undergoing airway reconstruction. Most patients are managed with a daily proton pump inhibitor and nighttime H2 blocker therapy. Patients continue the antireflux regimen for up to 1 year following successful reconstruction. Nonacidic reflux may also contribute to laryngeal inflammation and compromised healing. The authors believe that in some cases nonacidic reflux can cause damage in the reconstructed airway and potentially lead to operative failure. When medical treatment fails or nonacid reflux is suspected, a Nissen fundoplication or jejunal feeding should be considered before airway reconstruction. Inadequate management of the aforementioned mitigating factors can have a negative impact on an otherwise well-conceived and well-executed surgical plan. Stridor is generally mild but typically worsens with feeding, crying, and lying in a supine position. A subset of children with severe laryngomalacia (5%) may present with a spectrum of symptoms, including apnea, cyanosis, severe retractions, and failure to thrive. Although laryngomalacia usually resolves spontaneously by 1 year of age, severe disease necessitates surgical intervention. Characteristic findings include short aryepiglottic folds, with prolapse of the cuneiform cartilages. Because of the Bernoulli effect, characteristic collapse of the supraglottic structures is seen on inspiration. Determining whether to intervene surgically is based more on the severity of symptoms than on the endoscopic appearance of the larynx. In the 5% who require surgical intervention, this may be planned within 1­2 weeks of presentation. Supraglottoplasty, also referred to as epiglottoplasty, is currently the operative procedure of choice. Both aryepiglottic folds are divided, and one or both cuneiform cartilages may also be removed. Postoperative intubation is generally not required unless the child has some additional pathology; in such cases, overnight intubation may be necessary. Repeat fiberoptic laryngoscopy at the bedside is valuable in determining whether this can be attributed to laryngeal edema or persistent laryngomalacia that necessitates further surgery. Occasionally, although the postoperative appearance of the larynx is adequate, obstructive symptoms are ongoing. Such cases may have an underlying neurologic component, which becomes more evident with time. In neurologic variant laryngomalacia, supraglottoplasty often fails, thus requiring tracheotomy placement. Although it is usually idiopathic, it is sometimes seen in children with central nervous system pathology. Most children with bilateral paralysis present with significant airway compromise, although with an excellent voice. Acquired disease is generally, although not always, a unilateral condition arising from iatrogenic injury to the recurrent laryngeal nerve. Because of the length and course of the left recurrent nerve, this is far more likely to be damaged than the right recurrent laryngeal nerve. Unlike children with bilateral vocal cord paralysis, most children with unilateral disease have an acceptable airway but a breathy voice. The diagnosis of vocal cord paralysis is established with awake flexible transnasal fiberoptic laryngoscopy or stroboscopy. Children with acquired vocal cord paralysis (whether unilateral or bilateral) may experience spontaneous recovery several months after nerve injury; however, this occurs only if the nerve is stretched or crushed but is otherwise intact. Children with unilateral paralysis can be initially managed with observation, medialization by temporary injection, or speech and voice therapy. Neonates with acquired unilateral vocal cord paralysis are managed based on their symptoms and comorbidities. Regardless of which option is chosen, these children should be observed for at least 1 year prior to any permanent intervention. If paralysis persists after this period of time and there is a functional deficit, long-term interventions, such as ansa-cervicalis reinnervation, permanent medialization laryngoplasty, or long-term injection medialization, are considered. These options are discussed with the family and are often influenced by the age of the child and the presence of comorbidities. For patients with bilateral paralysis associated with an underlying disease process, successful treatment of that disease may reverse the paralysis; however, up to 90% of these infants ultimately require tracheotomy placement. Given that up to 50% of children with congenital idiopathic bilateral vocal cord paralysis have spontaneous resolution by 1 year of age, surgical intervention to achieve decannulation is almost always delayed until patients are older than 1 year of age. A more recent innovation to prevent the need for tracheotomy placement in neonates with bilateral cord paralysis is the introduction of the endoscopic anteriorposterior cricoid split. The aim of surgery is twofold: (1) to achieve an adequate decannulated airway while maintaining voice and (2) to prevent aspiration. Surgical options include laser cordotomy, partial or complete arytenoidectomy (endoscopic or open), vocal process lateralization (open or endoscopically guided), and posterior cricoid cartilage grafting. In a nontracheotomized child, a single-stage surgical procedure can be carried out. Acquired bilateral vocal cord paralysis that does not resolve spontaneously is usually less responsive to treatment than idiopathic cord paralysis. In these cases, more than one operative intervention may be required to achieve decannulation. The postoperative risk of aspiration should be evaluated by a video swallow study before the child returns to a normal diet. During the initial postoperative weeks, some children have an increased risk of aspirating with certain textures, especially thin liquids. In severe cases, as recanalization commences posteriorly and progresses anteriorly, complete laryngeal atresia may occur. In less severe cases a thin anterior glottic web may be the only remnant of the recanalization process.

Greenness and allergies: evidence of differential associations in two areas in Germany knee pain treatment home remedy buy generic toradol 10 mg line. Effects of secondhand smoke exposure on asthma morbidity and health care utilization in children: a systematic review and meta-analysis pain treatment after knee replacement buy toradol with a visa. Increasing prevalence of asthma pain treatment center of the bluegrass purchase toradol amex, allergic rhinoconjunctivitis and eczema among schoolchildren: three surveys during the period 1985-2008 cape fear pain treatment center pa order toradol 10 mg online. Developmental profiles of eczema pain treatment sickle cell toradol 10 mg buy, wheeze, and rhinitis: two population-based birth cohort studies. The march from early life food sensitization to allergic disease: a systematic review and metaanalyses of birth cohort studies. Component-resolved diagnosis in pediatric allergic rhinoconjunctivitis and asthma. Beyond atopy: multiple patterns of sensitization in relation to asthma in a birth cohort study. Multiple atopy phenotypes and their associations with asthma: similar findings from two birth cohorts. A systems biology approach to investigate the effect of pH-induced gene regulation on solvent production by Clostridium acetobutylicum in continuous culture. To what extent is allergen exposure a risk factor for the development of allergic disease Early life environmental control: effect on symptoms, sensitization, and lung function at age 3 years. Prophylactic use of sublingual allergen immunotherapy in high-risk children: a pilot study. Viral infections and atopy in asthma pathogenesis: new rationales for asthma prevention and treatment. Effect of smoke-free legislation on perinatal and child health: a systematic review and meta-analysis. The first 2-year home environment in relation to the new onset and remission of asthmatic and allergic symptoms in 4246 preschool children. Respiratory and allergic health effects of dampness, mold, and dampness-related agents: a review of the epidemiologic evidence. Residential culturable fungi, (1-3, 1-6)-beta-d-glucan, and ergosterol concentrations in dust are not associated with asthma, rhinitis, or eczema diagnoses in children. A cross-sectional study of the association between ventilation of gas stoves and chronic respiratory illness in U. Respiratory disease associated with solid biomass fuel exposure in rural women and children: systematic review and meta-analysis. Levels and sources of volatile organic compounds in homes of children with asthma. Volatile organic compounds and risk of asthma and allergy: a systematic review of observational and interventional studies. Benzene exposure and respiratory health in children: a systematic review of epidemiologic evidence. Systematic review of the effects of domestic paints on asthma related symptoms in people with or without asthma. Allergen sensitization results from the initial allergen exposure, and subsequent allergen exposure results in an allergic reaction. The fundamental pathophysiological features of asthma include airway hyperresponsiveness (which can also manifest as reversible airflow obstruction), inflammation, and structural changes in the airway wall, collectively termed airway remodeling. The development of allergic sensitization is also key to the immunopathology of pediatric disease. The combined clinical effects of these abnormalities result in the manifestation of symptoms which include shortness of breath and wheezing, with or without cough. A key factor that needs to be considered in the immunopathogenesis of pediatric asthma is the age of the child. Wheezing disorders are common in children aged 5 and under, but not all preschool wheezers will develop asthma and the mechanisms mediating preschool wheeze are likely to be distinct from those that result in progression to asthma and drive asthma in school-aged children. The aim of this chapter is to summarize what is known about the immunology and pathology of allergic asthma in children and to highlight specific situations, such as preschool wheeze, asthma exacerbations, and severe therapy resistant asthma, in which this common immunopathology may not apply. The need to focus on approaches to achieve disease modification and asthma prevention in the future will also be discussed. Altered Pulmonary Immunity in Asthma Inception Development of allergic sensitization is a key component of asthma pathogenesis in children. Sensitization may develop to food or aero-allergens and is initiated at mucosal or barrier surfaces where there is an epithelial layer. Respiratory mucosal surfaces (airways) are continuously exposed to inhaled, nonpathogenic foreign particles (antigens, microbes, and pollutants). A key challenge for the healthy respiratory system is therefore to distinguish innocuous antigens from pathological microbes. The pulmonary epithelium is the first point of contact and both barrier and immune function of this airway structure is altered in children with asthma. Eosinophils contain multiple granule proteins that exhibit an array of toxic and immune-modulatory activities. The granule proteins can be released by different mechanisms, including during an acute allergic insult, and they cascade the proinflammatory, Th2 responses associated with allergic asthma. Additionally, these proteins target any foreign antigen, promote inflammation in the 665 43 · the Immunopathogenesis of Asthma 665. Asthma in children is predominantly associated with the development of allergic sensitization and the pathological features of eosinophilic airway inflammation and structural airway wall changes, collectively termed airway remodeling. The clinical manifestation of disease is heterogeneous but includes symptoms of breathlessness and wheeze, which result from bronchoconstriction. Acute attacks in children commonly result from respiratory infection, with repeated episodes of infection with rhinovirus and respiratory syncytial virus in early life being especially associated with the risk of recurrent wheezing and asthma in children who also develop early allergic sensitization and have a genetic susceptibility. The focus of this chapter is to discuss the basic immunological mechanisms that drive the pathophysiology of asthma, with specific focus on the close interactions between innate and adaptive immune responses in driving disease. The immunopathology of specific clinical manifestations of disease, including exacerbations and preschool wheezing disorders, will also be discussed, and mechanisms that are unique to the developing pediatric airway and that cannot be extrapolated from adult disease will be highlighted. Environmental exposures such as allergens, viruses, cigarette smoke, and pollution, combined with an underlying genetic susceptibility and an altered airway microbiome, result in the development of altered pulmonary immunity and the pathophysiological abnormalities of asthma. Inhaled exposures cause barrier dysfunction, which makes the epithelium "leaky" and allows entry of allergens through the airway wall, to be recognized by the pulmonary antigen presenting cells (dendritic cells) for subsequent antigen processing and development of allergic sensitization. Immunoglobulin (Ig)-E antibodies are synthesized by B cells and released into the circulation where they recognize antigen. This is followed by binding to mast cells to release growth factors and mediators results in symptoms of allergy and asthma. Initiation of events that lead to Th2 inflammation Suppression of Th1 mediated immunity Recruitment of Th2 cells to the lung Release of growth factors that contribute to the development of airway remodeling7 Th, T helper. Glucocorticoids increase eosinophil apoptosis and block the survival effect of interleukin-5, resulting in a reduction in airway eosinophilia with steroid therapy. Each T helper cell subtype is defined by a unique transcription factor which determines its function and secretion of helper cell specific cytokines. However, this is an assumption based on extrapolation from animal and adult studies. As airway samples are not easily obtained from children, most studies investigating the mediators of allergic asthma include assessments of peripheral blood, but this is not always a reliable surrogate for the airways. The predominant mast cell mediators that are released include histamine and cysteine leukotrienes. Increased numbers of mast cells have been shown to be present specifically within airway smooth muscle in patients with asthma but not those with eosinophilic bronchitis. Although Th2 cells are important in driving allergic airway responses, these are not the only lymphocyte subset involved in asthma pathogenesis. Numerous other T-cell subsets have been implicated in asthma, including Th9 cells and Th17 cells. However, it is also becoming increasingly apparent that the inflammatory environment is central to determining cellular function. A change in milieu can result in a change in cytokine secretory pattern, which is termed T-cell plasticity. There is a critical balance between regulatory and proinflammatory T-lymphocytes that needs to be maintained to prevent disease, and it is proposed that in asthma an imbalance in favor of Th2 cells with a concomitant reduction in T regulatory (Tregs) cells results in disease manifestation. It is interesting to note that treatment with inhaled steroids results in higher levels of circulating32 and airway Tregs, but the cells remain functionally impaired. Innate Lymphoid Cells Until recently, the predominant immune response that was thought to drive allergic asthma was an adaptive response mediated by Ig-E and T lymphocytes. However, it is now apparent that innate immunity plays a significant role in asthma pathogenesis. Murine experimental models have demonstrated the release of innate cytokines from the airway epithelium in response to allergen. Environmental insults including allergens, infection, and pollution result in the pathogenesis of asthma with parallel development of airway inflammation and remodeling. The airway wall structures that are altered in asthma include the airway epithelium, increased thickness of the subepithelial matrix, and increased smooth muscle mass. There is no convincing evidence of increased airway mucosal neutrophils in children with asthma during stable disease. There is recent evidence showing a subgroup of children with severe asthma have increased neutrophils specifically within the airway epithelium, and contrary to expectation, those with intraepithelial neutrophils had better lung function, symptom control, and were on lower doses of maintenance inhaled steroids. The role of neutrophils in the specific case of wheezing in preschool disorders is discussed below. School-Age Allergic Asthma: Pathology and Mechanisms Asthma is a chronic inflammatory airway disease, which in children is characterized by a predominance of eosinophils in the airway wall and lumen. Targeting eosinophilic inflammation alone, using inhaled steroids, has resulted in improved symptom control and lung function in the majority of children; however, it is apparent that this approach in isolation does not achieve disease modification, specifically when used in early onset preschool disease. The predominant pattern of airway inflammation has been used to define and subdivide patients with asthma according to inflammatory phenotypes. These include eosinophilic, neutrophilic, pauci-granulocytic (no inflammation), or mixed. One reason for a "switch" in inflammatory phenotype is the development of an acute respiratory infection, which may change the profile from predominantly eosinophilic to neutrophilic or mixed. However, intriguingly, in children with asthma, change in airway inflammatory phenotype can be documented over time independently of exacerbations, symptoms, disease manifestation, or alteration in therapy. The differences between eosinophil targeted therapy in adults and children highlights the importance of investigating disease mechanisms in age appropriate experimental models and not undertaking direct extrapolation of data from studies in adults to children. Another issue that complicates the use of eosinophil biomarkers measured in the peripheral circulation and not in the airways in asthma is that other allergic conditions may also be associated with elevated levels. It is therefore important to interpret results, specifically of peripheral blood biomarkers, with some caution. However, it is now known that the pulmonary epithelium is not just a barrier, but is also immunologically active and is central to the development of immune responses involved in the pathogenesis of asthma. An important immunological function of the airway epithelium in asthma and other chronic inflammatory airway diseases is its ability to secrete cytokines in response to various stimuli. The role of the innate epithelial cytokines in initiating allergic airway responses and in the pathogenesis of asthma is currently being extensively investigated as a pathway that may lead to novel therapies. The actual cytokine released is determined by the environmental exposure and the host susceptibility. This key role in disease initiation has put the pulmonary epithelium at the center of asthma pathogenesis and it is a key tissue whose function is being extensively investigated to allow the discovery of novel therapeutic targets. Cohort studies have shown that there are several clinical phenotypes of wheezing in preschool children with different outcomes by school age. Prospective clinical phenotypes have therefore been defined by the European Respiratory Society. Little is known about immunopathogenesis and molecular mechanisms that specifically mediate viral episodic wheeze, but what is known is that usual therapies that are effective in allergic asthma at school age are rarely beneficial in preschool children with viral wheeze. Specifically, during exacerbations, there is no evidence for efficacy of systemic corticosteroids on any clinical outcome measure. Recently, it has become apparent that similar numbers of wheezing episodes in preschool children are associated with bacterial infections as with viral infection. Furthermore, bronchoscopy studies have shown that the airway inflammatory profile of episodic wheezers during stable disease is either similar to nonwheezing controls46 or it is predominantly neutrophilic,90,91 and may be associated with positive bacterial cultures, despite the absence of symptoms. There is extensive cross-talk and interaction specifically between mast cells and the airway smooth muscle in asthma (see above section on mast cells). Although the function of airway smooth muscle has been investigated in adult asthma, very little is known about its function in children with asthma. Although both have shown a benefit for their primary outcome,93,94 the use of azithromycin for acute preschool wheeze cannot be recommended in routine clinical practice, since both trials have significant limitations. It is known that in addition to eosinophilia, features of airway remodeling, specifically increased thickness of the reticular basement membrane, are already present in children with persistent, severe wheeze. The only pathological abnormality that predicts future asthma is airway smooth muscle,80 but at present there are no known biomarkers that represent smooth muscle function in preschoolers, so this feature cannot be used to identify future asthmatics. In any event, we lack interventions to prevent the evolution of preschool wheeze to asthma. Interestingly, murine models of house dust mite induced allergic airway disease have shown the pathophysiological manifestation of disease (airway hyperresponsiveness, total leukocytic inflammation, and airway remodeling) in mice that are deficient in eosinophils is the same as that in wild-type mice,98 suggesting little role for eosinophils alone in disease inception. In support of this conclusion, clinical trials that have used antiinflammatory therapies targeted to eosinophils (inhaled steroids) to prevent asthma development from preschool wheeze have failed. Although preschoolers may benefit symptomatically while taking the treatment, there was no sustained benefit from the inhaled steroids once treatment was stopped. The mainstay of treatment for asthma, inhaled glucocorticoids, targets eosinophils and they are of huge benefit in established disease.

However treatment for nerve pain from shingles purchase toradol 10 mg with visa, with time pain medication for dogs in heat discount toradol 10 mg without a prescription, the changes become fixed pain solutions treatment center hiram ga cheap toradol 10 mg with mastercard, with a vasodilatorunresponsive component that appears temporally related to the development of thickened vascular media and adventitia with dramatic increases in the deposition of structural matrix proteins such as collagen and elastin in the pulmonary arterial wall heel pain treatment stretches order generic toradol from india. In the classic autopsy studies by Wagenvoort and Wagenvoort myofascial pain treatment center watertown ma discount toradol 10 mg buy, medial hypertrophy was severe in patients younger than 15 years of age, and it was usually the only abnormality seen in infants. With increasing age, intimal fibrosis and plexiform lesions were seen more frequently. In general, younger children appear to have a more reactive pulmonary vascular bed relative to both vasodilatation and vasoconstriction. Severe acute pulmonary hypertensive crises occur in response to pulmonary vasoconstrictor "triggers" more often in young children than in older children or adults. Three major pathways involved in abnormal proliferation and contraction of the smooth muscle cells of the pulmonary artery in patients with pulmonary arterial hypertension are shown. At the top of the figure, a transverse section of a small pulmonary artery (<500 µm in diameter) from a patient with severe pulmonary arterial hypertension shows intimal proliferation and marked medial hypertrophy. Dysfunctional pulmonary artery endothelial cells (blue) have decreased production of prostacyclin and endogenous nitric oxide, with an increased production of endothelin-1-a condition promoting vasoconstriction and proliferation of smooth muscle cells in the pulmonary arteries (red). Current or emerging therapies interfere with specific targets in smooth muscle cells in the pulmonary arteries. In addition to their actions on smooth muscle cells, prostacyclin derivatives and nitric oxide have several other properties, including antiplatelet effects. Plus signs denote an increase in the intracellular concentration; minus signs blockage of a receptor, inhibition of an enzyme, or a decrease in the intracellular concentration. The integrity of the pulmonary vascular endothelium is critical for maintaining vascular tone, homeostasis, barrier function, leukocyte trafficking, transduction of luminal signals to abluminal vascular tissues, production of growth factors, and cell signaling with autocrine and paracrine effects. Whether these perturbations are a cause or consequence of the disease process remains to be elucidated. This endothelial dysfunction, coupled with the excessive release of locally active thrombogenic mediators, promotes a procoagulant state, leading to further vascular obstruction. Therefore the process is characterized by an inexorable cycle of endothelial dysfunction leading to the release of vasoconstrictive, vasoproliferative, and prothrombotic substances, ultimately progressing to vascular remodeling and progressive vascular obstruction and obliteration. The theory that certain individuals are genetically susceptible has led to genetically oriented research. It is now clear that gene expression in pulmonary vascular cells responds to environmental factors, growth factors, receptors, signaling pathways, and genetic influences that can interact with each other. There may be different subsets of patients in whom vasoconstriction is the predominant feature, and those in whom vascular injury or endothelial dysfunction is the primary problem. For example, children appear to have differences in their hemodynamic parameters at the time of diagnosis compared with adult patients. This may reflect earlier diagnosis and explain why children tend to have a greater response rate to acute vasodilator testing than adults. A brief review of the normal physiology of the pulmonary circulation will enable a better understanding of the pathophysiology of the pulmonary vascular bed. If there has been a gradual exposure over time, the right ventricle has the ability to remodel and adapt to the pressure overload by recruitment of sarcomeres and hypertrophy of myocytes. The right ventricular hypertrophy will assist the right ventricle in pumping against the increased afterload; however, this occurs at a cost to left ventricular integrity. Under normal conditions, the right ventricle is crescent shaped with the right ventricular free wall and interventricular septum concave around the left ventricle at both end diastole and end systole. During systole, the left ventricle contracts toward a central axis, while the right ventricular free wall and septum contract in parallel. With right ventricular hypertrophy, the interventricular septal orientation flattens and ultimately commits to the right ventricle in severe cases. This may lead to a vicious cycle of left ventricular diastolic dysfunction and subsequent worsening of right heart failure in severe cases. As pulmonary vascular disease progresses, the right ventricle fails and resting cardiac output decreases. As right ventricular dysfunction progresses, right ventricular diastolic pressure increases with clinical onset of right ventricular failure, the most ominous sign of pulmonary vascular disease. Abnormalities in signaling pathways lead to impairment of apoptosis and increase in proliferation. Most of these growth factors act by activating tyrosine kinase receptors, which initiates major signaling cascades within the cells, resulting in an antiapoptotic and proproliferative phenotype. Apoptosis the plexiform lesion forms a fascinating substrate for studying the mechanism of vascular proliferation and remodeling. Abnormalities in proteases and elastases are also implicated in abnormal lung remodeling. Syncopal episodes, which occur more frequently with children than with adults, are often exertional or postexertional and imply a severely limited cardiac output, leading to a decrease in cerebral blood flow. However, syncope may also reflect a very vasoactive circulation with rapid changes in the pulmonary vascular reactivity in response to various stimuli. Progressive right ventricular failure leads to dyspnea and a progressive decrease in cardiac output. When arterial hypoxemia and acidosis (respiratory or metabolic) occur, life-threatening arrhythmias may develop. Postulated mechanisms for sudden death include bradyarrhythmias and tachyarrhythmias, acute pulmonary emboli, acute pulmonary artery aneurysm rupture, massive pulmonary hemorrhage, and sudden right ventricular ischemia. Hemoptysis appears to be due to pulmonary infarcts from secondary arterial thromboses. Syncopal episodes, which occur more frequently with children than with adults, are often exertional or postexertional and imply a severely limited cardiac output, leading to diminished cerebral blood flow. Dilated pulmonary arteries compressing the coronary circulation have also been described to cause acute angina. A small proportion of patients, 3% and 7%, reported no symptoms in the two groups. Comorbidities such as pneumonia and other systemic infections result in alveolar hypoxia, leading to a downward spiral of pulmonary vasoconstriction and compromised cardiac output, resulting in cardiogenic shock and death. Acidosis can make the arrhythmias worse, and the loss of atrial kick in atrial fibrillation and flutter can lead to low cardiac output and death. Unless there is associated lung disease or pleural effusions from heart failure, the lung exam should be normal. It is critical to exclude all likely related or associated conditions that might be managed differently. A detailed history and physical examination, as well as appropriate tests, must be performed to uncover potential causative or contributing factors, as well as to assess cardiac function and functional class of the patient at baseline. Additional issues to address include obtaining a detailed birth/neonatal history, a medication history, exposure to high altitude or to toxic cooking oil, travel history, and any history of frequent respiratory tract infections, or venous or arterial thrombi. Ventricular septal flattening and posterior systolic bowing occur as the right ventricular pressure increases and then exceeds the left ventricular pressure. A redistribution of left ventricular filling from early to late diastole as demonstrated by Doppler reflects reduced compliance. Cardiac catheterization is performed under general anesthesia or conscious sedation. The younger the child is at the time of diagnosis, the more likely that the child will respond to acute testing, but there is wide variability. The presence of a robust response to acute vasodilator testing usually predicts long-term response to high-dose oral calcium channel blockade therapy. Unfortunately there are no additional hemodynamic or demographic variables that accurately predict whether or not a child will respond to acute vasodilator testing. Patients who do not manifest a response to acute vasodilator testing are unlikely to have clinical benefit from chronic oral calcium channel blockade therapy. Furthermore, acute deterioration and decompensation may occur with empiric calcium channel blockade therapy in patients who are not acutely responsive, particularly in children with underlying lung disease. Left heart catheterization is done to assess pulmonary venous, left atrial, and left ventricular pressures and to evaluate for covert or overt diastolic dysfunction, and angiograms are performed to evaluate for aortopulmonary collaterals, pulmonary vein stenosis, and peripheral pulmonary artery stenosis or occlusion with thrombus. Noninvasive studies obtained prior to initiating therapy, as well as periodically thereafter, are useful in guiding changes in therapeutic regimens, particularly in light of advances with various novel therapeutic agents. It is a useful test to follow patients on therapy; however, in pediatrics, one must take into account age, height, and weight while interpreting the results, and its utility has not been well-validated in children. This test is performed in children older than 7­8 years, who are capable of using a bicycle ergometer. Variables measured include maximal oxygen consumption, carbon dioxide elimination, cardiac output, and anaerobic threshold. Baseline and follow-up laboratory testing performed include the following: (1) Those required to diagnose etiology of disease include hematologic tests for coagulopathy, factor V Leiden abnormalities, hemoglobinopathies, and connective tissue disorders. A sleep study is recommended in patients at risk for sleepdisordered breathing, including children with genetic syndromes, former preterm infants, obese children, and those who do not respond appropriately to targeted therapy. Because children often have a more reactive pulmonary vascular bed than adult patients, any respiratory tract infection that results in ventilation/perfusion mismatching from alveolar hypoxia can result in a serious or even catastrophic acute pulmonary hypertensive crisis if not treated aggressively. Influenza and pneumococcal vaccinations are recommended unless there are contraindications. Antipyretics should be administered for temperature elevations greater than 101° F (38° C) to minimize the consequences of increased metabolic demands on an already compromised cardiorespiratory system. Patients may require antitussive medications during upper respiratory infections to prevent excessive coughing, which increases pulmonary artery pressures and can result in acute pulmonary hypertensive crises. Decongestants with pseudoephedrine should be avoided because they may exacerbate the pulmonary hypertension. Diet and medical therapy should be used to prevent constipation because Valsalva maneuvers transiently decrease venous return to the right side of the heart and may precipitate syncopal episodes. In patients with poor right ventricular function, thrombi can form within the ventricle, and postmortem examinations of patients with pulmonary vascular disease who have died suddenly often demonstrate fresh clot in the pulmonary vascular bed. Whether or not secondary thrombosis in situ is a significant exacerbating factor in patients with a normal resting cardiac output is unknown. In addition, even a small pulmonary embolus can be life-threatening in patients who cannot vasodilate or recruit additional pulmonary vessels. Whether or not chronic anticoagulation is efficacious and safe for children with pulmonary hypertension remains to be determined. The guidelines suggest anticoagulation in older children who are hypercoagulable or in right heart failure, similar to the approach for adult patients. Antiplatelet therapy with aspirin or dipyridamole does not appear to be effective in areas of low flow, where thrombosis in situ is known to occur. Parents should be advised to avoid administering other medications that could interact with the warfarin unless the possible interactions are known, and the dose of the warfarin is adjusted as needed. Similar to the approach with adult pulmonary hypertension patients, if anticoagulation with warfarin is contraindicated or dose adjustments are difficult, low-molecular-weight heparin at a dose of 0. However, the long-term side effects of heparin, such as osteopenia and thrombocytopenia, are of concern. To date there are no studies comparing the safety and efficacy of anticoagulation with warfarin to heparin. This supports the importance of an initial assessment by cardiac catheterization with acute vasodilator testing before prescribing a long-term pulmonary vasodilator. In our experience, acute "responders" who are treated with chronic oral calcium channel blockade therapy continue to do exceedingly well as long as they remain acutely reactive to vasodilator testing on repeat cardiac catheterizations. In contrast, children who are initially acute "responders" and are treated with chronic calcium channel blockade, and who then stop demonstrating active vasoreactivity on repeat testing, usually deteriorate clinically and hemodynamically despite continuation of chronic calcium channel blockade therapy. If they are then treated with continuous intravenous epoprostenol, they will probably demonstrate improvement similar to the experience with children who are "nonresponders. In addition, six randomized controlled trials evaluating combinations of agents. Chronic calcium channel blockade is efficacious for patients ("responders") who demonstrate a robust acute response to vasodilator testing, although not all acute "responders" have a sustained long-term response. In general, these "nonresponders" will respond to long-term treatment with an intravenous prostacyclin, such as epoprostenol, and may respond to other novel treatments. The term "nonresponder" is only used with respect to acute vasodilator testing and calcium channel blockade response. For acute responders, most adult studies have used calcium channel blockers at relatively high doses. Unfortunately, results from the use of vasodilators, which could affect the systemic as well as the pulmonary circulation, led to progressive disenchantment with one agent after another. Pediatric pulmonary hypertension: guidelines from the American Heart Association and American Thoracic Society. A landmark development for patients who failed to satisfy the criteria for a good hemodynamic response to acute vasodilator testing was the demonstration that such patients respond to continuous infusions of epoprostenol. That is, patients who fail to respond acutely to intravenous epoprostenol can respond chronically. Indeed, a substantial number of such patients have been treated this way for many years or have used continuous intravenous epoprostenol as a transition to transplantation or newer drug therapies. During this evolution, heart-lung and then lung transplantation became increasingly feasible and available, although the donor supply is still a significant limiting factor. Alternative forms of delivery of longeracting prostacyclin analogues, including subcutaneous and inhaled, are approved in adults and being used in children. However, none of these modalities are free from complications, and one must remember that all of these drugs were evaluated primarily in adult patients and not in children. Thus safety concerns for a class of drugs may be greater or less in children, based on their metabolism being different from adults. Many affected children are still growing, with ongoing lung development, and the optimal doses are not necessarily being used (or known). The continuous infusion of a prostacyclin analogue has the risks associated with a permanently placed intravenous catheter, such as bacteremia, sepsis, or thromboembolic events.

Suggested explanations for this phenomenon include an increased strength of the right hemidiaphragm treatment pain during intercourse cheap toradol 10 mg online, the presence of the liver pain diagnosis and treatment center pittsfield ma purchase line toradol, and a weakness of the left hemidiaphragm at points of embryonic fusion pain medication for dogs uk 10 mg toradol order visa. If the rupture is not initially diagnosed pain treatment for bulging disc buy toradol online from canada, intestinal obstruction may be the leading symptom at the time of late diagnosis pain & depression treatment toradol 10 mg with mastercard. Placement of a nasogastric tube can sometimes show gastric herniation into the chest. A contrast swallow of Gastrografin or thin barium will help confirm the presence of stomach or intestine in the hemithorax. In those patients with high suspicion for traumatic diaphragmatic rupture, exploratory laparoscopy or thoracoscopy plays an important role and should be strongly considered. It can be approached via either the chest or the abdomen, but given the high rate of associated abdominal injuries, most trauma surgeons recommend the abdominal approach. Thoracoabdominal Injuries In infants and children, combined injury to the thorax and abdomen, including diaphragm rupture, is usually preceded by a violent traffic accident or other forms of sudden, jolting impact. Splenic and hepatic lacerations commonly occur with minimal external evidence of injury and need not be associated with fractured ribs or soft tissue mutilation. The clinical signs of upper abdominal tenderness, rigidity, and rebound tenderness almost uniformly accompany lower chest trauma and are explained by the abdominal distribution of the intercostal nerves. Therefore, peritoneal irritation, of itself, is not conclusive evidence of a combined or abdominal injury. Diaphragm rupture can occur with minimal soft tissue injury, and there may be chest pain, dyspnea, and hypotension. On inspection, the involved chest wall lags during inspiration, and percussion can be dull or hyperresonant. Chest radiographs may not show fractured ribs, but almost invariably demonstrate abnormality or absence of the diaphragmatic shadow on the affected side. There is usually mediastinal shift to the right, because in 90% of cases the posterolateral left leaf of the diaphragm is torn in a radial manner. The presence of blood alone (lacerations of spleen/liver) typically does not result in peritonitis in the absence of hollow viscous injuries (stomach, small bowel, colon). The preliminary management of combined thoracoabdominal injuries must provide an adequate airway and circulation, gastric decompression, and evaluation and control of other injuries. Intraabdominal hemorrhage and perforation with thoracic and abdominal soiling is an obvious indication for immediate exploration. Ideally, exploration should be undertaken as soon as systemic stabilization has been achieved. Paediatric trauma: urban epidemiology and an analysis of methods for assessing the severity of trauma in 598 injured children. Severe blunt thoracic trauma: differences between adults and children in a level I trauma centre. Chest computed tomography imaging for blunt pediatric trauma: not worth the radiation risk. Cardiac enzymes are irrelevant in the patient with suspected myocardial contusion. Prospective randomized controlled trial of operative rib fixation in traumatic flail chest. A twenty year (1971­1990) review of tracheostomies in a major paediatric hospital. Indications, complications, and surgical techniques for pediatric tracheostomies-an update. Establishing a role for intra-pleural fibrinolysis in managing traumatic haemothoraces. Tracheobronchial injury by blunt trauma in children: is emergency tracheobronchoscopy always necessary Conservative and surgical treatment of acute posttraumatic tracheobronchial injuries. Traumatic wet lung; observations on certain physiologic fundamentals of thoracic trauma. A caveat to the performance of pericardial ultrasound in patients with penetrating cardiac wounds. Serum troponin-I as an indicator of clinically significant myocardial injury in paediatric trauma patients. Cardiac and great vessel injuries in children after blunt trauma: an institutional review. Pediatric emergency department thoracotomy: a large case series and systematic review. Evaluation and management of blunt traumatic aortic injury: a practice management guideline from the Eastern Association for the Surgery of Trauma. Progress in the treatment of blunt thoracic aortic injury: 12-year single-institution experience. Evolution in management of adolescent blunt aortic injuries-a single institution 22-y experience. A case report of traumatic aortic rupture in a pediatric patient: a possible role for endovascular management as a bridge to definitive repair. Videothoracoscopic drainage of mediastinal abscess: an alternative to thoracotomy. Penetrating left thoracoabdominal trauma: the incidence and clinical presentation of diaphragm injuries. There have been reports that plasma cell granulomas are usually preceded by respiratory infections. Most of these lesions are slow growing, although in some rare cases they can spread quickly, leading to airway compromise. They can differ in location from the chest wall, to the mediastinum, to the lung itself. A lung mass in the pediatric population is 10 times more likely to be a benign process than a malignant one. The most common location of chest tumors is the mediastinum, and mediastinal masses can be further divided by their location into three compartments: anterior, middle, and posterior mediastinum. Mediastinal masses tend to occur early in the pediatric population, with around 40% of mediastinal masses occurring before the age of 2. The lesions are usually located peripherally in the parenchyma of the lung but have also been noted, rarely, to be located centrally, as well as within the chest wall. Etiology the etiology of tumors of the chest ranges widely, depending on the location of the tumor. In terms of primary pulmonary lesions, tumors can arise from both the tracheobronchial tree and the pulmonary parenchyma itself, and they can accompany a wide variety of subtypes, from benign (inflammatory pseudotumor and hamartomas) to malignant (bronchial adenoma, bronchogenic carcinoma, pleuropulmonary blastoma). While the name adenoma suggests a benign process, bronchial adenomas can become malignant. There are three histologic types of bronchial adenomas: carcinoid, cylindroma, and mucoepidermoid. Around 80%­85% of bronchial adenomas in children are the carcinoid type, and they are similar in resemblance to carcinoid tumors of the small bowel. They are low-grade tumors, which can metastasize, but most are slow-growing tumors that can grow into the bronchial wall. Carcinoid syndrome itself is rare, although it has been reported in the pediatric population. These lesions are typically seen in patients less than 40 years old, with the majority in the pediatric population occurring in the age group between 8 and 12 years old. They are the most common benign lung tumors in the pediatric population, making up more than 50% of benign lesions and 20% of all primary lung lesions. In a cases series of 28 patients, there was predominance toward male patients, 1072 74 · Tumors of the Chest 1072. Therefore, depending on the etiology, the incidence and epidemiology differ widely. Despite the wide differential, using a systemized approach can lead to the correct diagnosis and treatments that lead to favorable outcomes for the patient. This article covers the wide range of processes that can lead to solid tumors in the pediatric population in the chest, how to organize them within systems, and their most common manifestations and treatments. Mucoepidermoid tumors originate in the larger airways and are the rarest subtype, comprising only 1%­5% of bronchial adenomas. Bronchial adenomas usually present with vague pulmonary symptoms such as fever, cough, chest pain, recurrent pneumonitis, and hemoptysis as the tumor slowly grows into the airway and causes incomplete obstruction. The rarity of these disorders commonly causes a delay in diagnosis, often for years. The tumors usually involve the right main bronchus and are 5 times more likely to be seen in boys. Treatment consists primarily of resection of a segment, lobe, or complete lung, according to the degree of involvement, which may be done thoracoscopically or via thoracotomy, depending on the location and extent of the lesion. Luminal excision by bronchoscopy should not be done because it does not permit complete removal of the tumor. Rarely a bronchial adenoma can be removed by bronchial or sleeve resection, followed by airway reconstruction. They are primarily mesenchymal tumors and are divided into benign and malignant disease, with up to 60% being malignant. Chest wall masses often present as seemingly innocuous lumps that are noticed on the chest, which may demonstrate growth. They are typically slow-growing and asymptomatic, but pain can be a presenting symptom that raises the concern for a malignant process. A small percentage of these tumors can have effects on respiratory mechanics, depending on their location and size. Benign tumors of the chest wall are less common than malignant ones and have a wide variety of etiologies. The most common soft tissue benign lesion of the chest wall derives from the myofibroblast,17 including infantile myofibromatosis and desmoid fibromatosis tumor. Infantile myofibromatosis typically presents at birth or early in life and usually undergoes spontaneous regression. In contrast, desmoid fibromatosis can be more challenging to deal with, as they originate as overgrowths of fibrous tissue that can extend through muscle and fascial planes. Full excision can be challenging, and these patients often undergo multiple surgeries. Most pediatric bronchogenic carcinomas are undifferentiated adenocarcinomas, with squamous cell carcinomas being much less common in the pediatric population, in contrast to the adult population. Usually asymptomatic, the majority of cases present late in the course of the disease leading to a poor prognosis; the mortality is more than 90%, with a mean duration of survival of only 7 months. Localized lesions can be resected with postoperative chemotherapy, but this applies to only a small subset of patients. These typically occur in younger children prior to the age of 6 years and can behave aggressively with high rates of metastasis. Type I is purely cystic and is diagnosed around the age of 10 months, with a survival rate of 80%­85%. They have a characteristic appearance on radiograph with large calcifications arising from one or more ribs causing distortion of the osseous thorax. Although this description suggests an aggressive, possibly malignant process, mesenchymal hamartomas are benign, with no reports of malignant degeneration, recurrence, or metastasis after resection. Resection should only be undertaken to relieve respiratory symptoms related to mass effect from the lesion. The most common benign skeletal neoplasms are osteochondromas, and they account for almost half of all tumors arising from the ribs. There is a characteristic "cartilage cap" seen on plain radiograph, and if the cap is greater than 1 cm, there is concern for the risk of chondrosarcoma. Chondromas are benign tumors that arise in the costal cartilage and are composed of mature hyaline cartilage, usually at the sternocostal junction. They are typically slowgrowing, painless masses that are not aggressive in nature. While benign, they are very similar in clinical course and in terms of imaging features to chondrosarcomas. For ease of definition of sites of disease, the mediastinum may be thought of as divided into three compartments: (1) the anterior mediastinum-the portion of the mediastinum that lies anterior to the anterior plane of the trachea; (2) the middle mediastinum-the portion containing the heart and pericardium, the ascending aorta, the lower segment of the superior vena cava, bifurcation of the pulmonary artery, the trachea, the two main bronchi, and the bronchial lymph nodes; and (3) the posterior mediastinum-the portion that lies posterior to the anterior plane of the trachea. However, given their similar appearance to chondromas, they are important to distinguish. They are slow-growing lesions that can start to cause pain, and they have a risk of late metastasis. The direction of growth appears to be entirely internal, thus stimulating the radiologic appearance of a primary pleural or mediastinal tumor. It should be assumed that there is micrometastasis present at the time of diagnosis. Symptoms include the development of a painful mass, dyspnea, weight loss, and, in some cases, Horner syndrome. Prognosis for these tumors can be quite dismal, with 2- and 6-year survival rates being reported at 38% and 14%, respectively. Any lymph node enlargement in a child should be viewed with suspicion, since lymphatic tumors are one of the more frequently observed malignant growths in childhood. Lymphoma is the third most common malignancy in children overall and represents almost half of all mediastinal malignancies. Hodgkin disease, lymphosarcoma, and reticulum cell sarcoma are found primarily in children older than 3 years of age, with a peak incidence between 8 and 14 years of age.

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The radionuclide salivagram in children with pulmonary disease and a high risk of aspiration myofascial pain treatment uk toradol 10 mg overnight delivery. Using the radionuclide salivagram to detect pulmonary aspiration and esophageal dysmotility milwaukee pain treatment services 10 mg toradol purchase with visa. Agreement of aspiration tests using barium videofluoroscopy sciatica pain treatment natural order on line toradol, salivagram chest pain treatment protocol 10 mg toradol purchase visa, and milk scan in children with cerebral palsy knee pain treatment youtube purchase genuine toradol online. Botulinum toxin A injection of salivary glands in children with drooling and chronic aspiration. Effect of botulinum toxin in the treatment of drooling: a controlled clinical trial. When are bilateral submandibular gland excision and parotid duct ligation indicated Four-duct ligation: a simple and effective treatment for chronic aspiration from sialorrhea. Salivary gland surgery for control of chronic pulmonary aspiration in children with cerebral palsy. The maturation of feeding and swallowing skills evolves in a natural and seemingly effortless progression in typically developing infants and children. Given that the pharynx is a shared pathway for breathing and swallowing, precise coordination of respiration and swallowing ensures maintenance of airway protection during feeding. Intact anatomy and function of the aerodigestive tract and normal development of neural control mechanisms are essential. Feeding and swallowing dysfunction (pediatric dysphagia) occurs in infants and children because of a multitude of factors, including structural anomalies in the aerodigestive tract, static or degenerative neurologic conditions affecting the range and strength of the necessary musculature, and cardiopulmonary conditions that result in respiratory compromise with oral feeding attempts. Etiologies of dysphagia are not mutually exclusive, and often multiple interacting factors are present. The multifactorial nature of feeding and swallowing disorders necessitates the involvement of multiple disciplines in the evaluation and management process. Therefore a team approach is efficacious in the consideration of issues that involve disciplines including, but not limited to , otolaryngology, gastroenterology, pulmonary medicine, radiology, occupational therapy, nutrition therapy, and speech pathology. This article will review the clinical and procedural evaluation and management of infants and children presenting with feeding and swallowing from a multidisciplinary perspective. Anatomy, Physiology, and Development the larynx serves three functions: connection of the upper and lower respiratory airway, closure for protection of the lower airway during swallowing, and generation of sound for voice. Identification of the maturational changes that occur in the anatomy of the aerodigestive tract and in the ontogeny of feeding and swallowing development is fundamental in delineating physiologic abnormalities and in defining the effect of compensatory strategies for improvement of laryngeal function. In terms of anatomy, there are differences in the size and location of the structures associated with the key laryngeal functions in the infant as compared with the child or adult. At birth, the larynx is positioned relatively high in the neck, located adjacent to cervical vertebrae C1 to C3, and later descending to levels C6 to C7. The thyroid cartilage of the pediatric larynx is rounded, the epiglottis may have an omega shape, and the cricoarytenoid joints and vocal processes are proportionately larger than in the adult larynx. As the infant grows, the prominent buccal pads decrease, the oral cavity increases in size, and the relative size of the tongue decreases. More space is available for differentiated tongue movements during both feeding and speaking. Elongation of the pharynx occurs as does the maturational descent of the larynx from C3 to C6 by approximately 3 years of age. As the larynx descends, increased neuromuscular control of the structural Epidemiology There is no universal, standardized clinical assessment instrument available that covers the range of ages and conditions that have accompanying pediatric dysphagia. Therefore standardized data collection and reporting are not possible, and the true epidemiology of pediatric dysphagia is largely unknown in infants and children. Available assessment protocols are targeted toward specific age ranges and condition types, for example, for characterizing preterm infant feeding behaviors, assessing oral motor skill development, and documenting signs and symptoms of dysphagia in specific diagnoses or conditions. It has been widely reported that at least 25% of typically developing children experience some type of feeding difficulty, such as chewing difficulty, choking, or texture refusal. Knowledge of the specific mechanisms of dysphagia associated with congenital and acquired medical conditions is essential. Adverse consequences of dysphagia include inadequate nutritional intake and the aspiration of secretions, food, and liquid leading to potential pulmonary contamination, infection, and morbidity. Clinical pathways for multidisciplinary assessment, medical management, and dysphagia treatment are discussed. Collaboration and communication are essential between services to ensure comprehensive assessment and optimal management. There are further structural and regulatory interrelationships within the brainstem, specifically the medulla. Anatomic changes in oral and pharyngeal structural relationships, as well as maturation of the central nervous system during the first 2 years of life, are reflected in the transition to mature oral motor/feeding and swallowing skills. Sucking occurs early in utero and continues as the primary means of obtaining nutrition for the first 3­4 months of life. Head control and stability improve with differentiation of tongue movements at 7­9 months of age, at which time increased food textures are typically presented. Continued emergence of active oral motor movements such as tongue lateralization and rotary chewing facilitate the transition to table foods at approximately 1 year of age. By approximately 2 years of age, oral motor/feeding Phases of Swallowing the swallowing process is composed of the oral preparatory, oral, pharyngeal, and esophageal phases. It is also essential to have intact muscular strength and coordination of the buccal and oral musculature. Adequate oral preparation of the bolus, followed by posterior transfer of the bolus to the hypopharynx via tongue base retraction and simultaneous closure of the soft palate against the posterior pharynx occurs. After the oral bolus is transferred to the hypopharynx, airway protection must occur during the pharyngeal swallowing phase to prevent aspiration. After passage of the bolus has occurred, the larynx returns to its resting position, the airway reopens, and respiration resumes. Swallowing apnea and glottic closure are linked events, although swallowing apnea has been described to occur as a result of a dedicated neural command. The information passes to the nucleus solitarius, which is responsible for the regulation of swallowing and respiration. The cricothyroid stretches and tenses the vocal fold and is innervated by the external branch of the superior laryngeal nerve. The posterior cricoarytenoid is the sole abductor of the vocal folds and is innervated by the recurrent laryngeal nerve. The lateral cricoarytenoid adducts the interligamentous portion of the vocal fold and is supplied by the recurrent laryngeal nerve. The thyroarytenoid and the transverse and oblique arytenoids are likewise innervated by the recurrent laryngeal nerve. Its medial portion, the vocalis, relaxes the posterior vocal ligament while maintaining and increasing tension of the anterior portion. The transverse and oblique arytenoids close the intercartilaginous portion of the glottis. During the pharyngeal phase of the swallow, the upper esophageal sphincter relaxes and allows the bolus to enter the esophagus, initiating the esophageal phase of the swallow. Peristaltic contractions propel the bolus through the esophagus, and the lower esophageal sphincter subsequently relaxes to allow the bolus to pass into the stomach. Propagation of the peristaltic wave is reliant upon the intrinsic myenteric plexus and on vagal afferents. The transit time of the esophageal phase is much longer than the pharyngeal phase, between 3 and 9 seconds. Outcome data related to the persistence or resolution of pediatric dysphagia are limited. Empirical research is limited by the inconsistencies in the classification of dysphagia and in the terminology used to describe the physiologic aspects of dysphagia. The use of standardized clinical pathways and data reporting systems during the workup of dysphagia, for both clinical and instrumental assessment, will facilitate the accumulation of standardized data needed to track the course of the dysphagia in association with specific conditions and diagnoses to predict outcomes. Conditions Associated With Feeding, Swallowing, and Airway Protection Problems Difficulty with the oral, pharyngeal, or esophageal phases of swallowing may occur because of structural, neurologic, cardiorespiratory, metabolic, or inflammatory disorders (Table 77. Anatomic defects in the oral cavity or oropharynx create difficulty in the oral phase of swallowing and include craniofacial syndromes, cleft lip and cleft palate, and macroglossia. Surgical reconstruction may alleviate the obstructive structural defects, although problems Table 77. Precise integration of functions is required for protection of the lower airway from aspiration during swallowing. There is a variety of anatomic and neurologic etiologies that may affect the structural integrity and interrelated physiology of feeding and swallowing. Many children with complex airway conditions also have concomitant neurodevelopmental delays that place them at even higher risk for feeding and swallowing disorders. Neurologic conditions are by far the most common etiology of potential feeding, swallowing, and airway protection problems. Neuromotor impairment as a result of cortical dysfunction, abnormality in the brainstem, or cervical cord injury may affect laryngeal functions that are critical for adequate feeding/swallowing, phonation, and airway protection. In older infants and children, problems with respiratory compromise are reflected in poor respiratory support during phonation and poor coordination or inappropriate timing of airway protection during swallowing, resulting in coughing, choking, noisy breathing, or recurrent episodes of pneumonia, bronchitis, or atelectasis. Chronic reflux or irritation to the laryngeal area has been associated with airway reconstruction failure. Congenital subglottic stenosis is relatively rare and typically occurs in conjunction with genetic syndromes or laryngeal malformations. Acquired laryngotracheal stenosis is more common, occurring after manipulation or insult to the airway. Such conditions comprise subglottic stenosis because of prolonged or traumatic intubation, hypopharyngeal stenosis secondary to trauma or caustic agent inhalation or ingestion, vocal fold paralysis as a result of surgical intervention, and tracheal stenosis following intubation. Tracheotomy with later surgical intervention for reconstruction and expansion of the airway is often necessary. The surgical reconstruction techniques are selected based upon the extent and location of the airway lesion and are designed to expand or resect the airway. Avoidance of damage to the recurrent laryngeal nerve, as well as to intact laryngeal structures, is a primary goal. As discussed previously, an important consideration is the effect that the necessary surgical interventions may have upon the laryngeal functions of phonation and airway protection during swallowing. As children with complex airway conditions often have persistent aspiration or severe reflux, they may be candidates for fundoplication prior to airway reconstruction. It should be noted that these procedures can worsen unrecognized esophageal dysmotility, leading to symptoms of gagging and retching. Swallowing is possible during the period that the stent is in place; however, difficulties may arise, depending upon the necessary location of the stent. If placement of the stent is necessary at the glottic level, swallowing dynamics are affected. If the stent location extends to the level of the arytenoids or to the base of the epiglottis, swallowing dynamics may be significantly compromised. Patients who undergo placement of posterior grafts may be at risk for destabilization of the cricoarytenoid joint and lateral cricoarytenoid muscles and are therefore at risk for difficulty with airway protection during swallowing and significant degrees of dysphagia. The coordination and strength of lip, tongue, and jaw patterns during feeding may be limited by underlying muscle tone abnormalities and/or sensory processing dysfunction. Neurologic conditions may interfere with appropriate coordination of oral motor movements during feeding and have a negative impact on the timing of swallowing and airway closure. Underlying structural issues may preclude closure of the airway during swallowing. As such, clinical signs and symptoms of feeding and swallowing dysfunction observed during the clinical assessment may signal feeding inefficiencies or threats to airway protection. Changes in physiologic status during feeding are of concern, such as decreased oxygen saturation or increases in respiratory or heart rate. Increased stridor with the respiratory effort of feeding, coughing, choking or gagging, color changes, or an increased wet, vocal quality should be noted. Of note, "silent" aspiration (no overt sign of airway protection threat) has been shown to be prominent in infants and in children with neurologic impairment and feeding difficulties. The relative advantages and disadvantages of each examination are summarized in Table 77. Abnormalities in the swallowing process, such as premature or inefficient oral bolus transfer, delayed initiation of swallowing response (Video 77. Patient reaction or response to abnormalities in the swallowing process can be assessed. For example, protective reaction or adequacy of clearing response to episodes of aspiration can be ascertained. Compensatory strategies can be implemented to assist with maintenance of airway protection during swallowing or to improve swallowing efficiency. Positioning adjustments, increasing liquid viscosity/texture alteration, altering the bolus delivery system. Implementing compensatory strategies adds to the overall radiation exposure time, limiting the extent to which options can be tested. In addition, patients with congenital, traumatic, or surgical upper airway anomalies (either preoperative or postoperative) are excellent candidates given that the otolaryngologist gains information Table 77. Compensatory strategies to assist with achieving airway protection during swallowing. In addition, use of lidocaine gel on the scope facilitates numbing of the nasal passageway and may also increase patient comfort with the procedure. Patients with oral hypersensitivity or oral aversion may have a gagging reaction in response to the tactile stimulation of the instrument and may therefore have difficulty participating in a functional exam.

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