Noreen A Hynes, M.D., M.P.H.

• Director, Geographic Medicine Center of the Division of Infectious Diseases
• Associate Professor of Medicine

https://www.hopkinsmedicine.org/profiles/results/directory/profile/0010761/noreen-hynes

The lining is made of pseudostratified ciliated columnar epithelium menopause weight loss generic ardomon 50 mg otc, and the cilia move the mucus down towards the most inferior aspects of the pharynx menstruation wont stop discount ardomon 25 mg with amex. The oropharynx lies in a posterior position to the oral cavity and extends from the soft palate to the level of the hyoid bone women's health center westwood discount ardomon 50 mg overnight delivery. This area serves both the respiratory and digestive systems as it is where food women's health clinic elko nv order ardomon australia, drink and air pass menstruation 2 months discount ardomon 100 mg visa. In infants, the tongue, which is large in relation to the oral cavity, can also obstruct the airway when consciousness is impaired, and this needs to be considered in managing the drowsy infant, and also during resuscitation. It opens into the oesophagus posteriorly and the larynx anteriorly (Tortora and Derrickson, 2006; Stoelting and Miller, 2007, cited in Crawford (2011a)). Clinical application When a child or infant is found to be unconscious or unresponsive one of the first considerations is hypoxia. The larynx the larynx is a complex structure that permits the trachea to be joined to the pharynx as a common pathway for respiration and digestion. It is also essential in clearance of secretions through coughing and in the production of sound. The larynx, or voice box, is a short passage linking the laryngopharynx with the trachea. It lies in the midline of the neck, anterior to the oesophagus in the region of the third to fourth the respiratory system Chapter 10 (C34) cervical vertebrae in infants, lowering to the fourth to sixth cervical vertebrae (C46) by adulthood. The larynx of an infant is cone shaped at the top with the cricoid cartilage tilting posteriorly. The axis of both the respiratory and digestive systems allows simultaneous breathing and swallowing in newborns (Tortora and Derrickson, 2006; Savkovi et al. The narrow dimensions of the larynx mean that even a minor obstruction in the infant can be life threatening, unlike in the adult. The narrowest portion of the airway in the older child and adult is the glottic aperture, while the narrowest part of the airway in the infant is the subglottis. A diameter of 4 mm is considered the lower limit of normal in a full-term infant and 3. The vocal cords of the neonate are usually 6 mm long, increasing to 7 mm wide and 11 mm long or approximately one-third the size of an adult. The wall of the larynx is made of three pieces of cartilage: the thyroid, epiglottis and cricoid cartilages. The arytenoid cartilage, which is paired, is significant owing to their role in changing the position and tension of the vocal folds or true vocal chords. In infants and children, the cricoid ring is a complete ring of cartilage and the narrowest point of the upper airway. This is usually larger in men as it is due to the influence of male hormones during puberty (Tortora and Derrickson, 2006; Savkovi et al. Owing to the age-dependent mineralization and ossification changes that take place in the bone and cartilage tissue of the larynx, radiological images should be used with caution as evaluation of this type is difficult in clinical practice if there are concerns about possible aspiration or inhalation (Turkmen et al. It is proportionally narrower than that of an adult and assumes either a tubular form or the shape of the Greek upper case letter Omega. The central role of the epiglottis is to protect the respiratory system during swallowing, to prevent food and liquid passing into the airway. The glottis is made of a pair of folds of mucous membrane, the vocal folds or true vocal chords, and the space between them known as the rima glottis. When small particles of dust, smoke or liquids pass into the larynx a cough is usually triggered to expel the substance. Failure of this mechanism can lead to aspiration and further complications (Tortora and Derrickson, 2006). The cricoid cartilage is a hyaline cartilage ring forming the inferior wall of the larynx. It is attached to the trachea by the first ring of cartilage known as the cricotracheal ligament. The arytenoid cartilage is a pair of triangular hyaline cartilages located at the posterior, superior border of the cricoid cartilage. The corniculate cartilages are a pair of elastic cartilages located at the apex of each arytenoid cartilage. The cuneiform cartilages are a pair of wedge-shaped elastic cartilages anterior to the corniculate cartilages and support the vocal cords and the lateral aspect of the epiglottis (Tortora and Derrickson, 2006). The trachea the trachea, or windpipe, allows the flow of air to and from the lungs. The layers of the trachea are the mucosa, submucosa, hyaline cartilage and adventitia (areolar connective tissue). The tracheal mucosa is lined with an epithelial layer of pseudostratified ciliar columnar epithelium. Transverse smooth muscle fibres, trachealis muscle and elastic connective tissue stabilize the tracheal wall, preventing collapse, especially during inhalation (Tortora and Derrickson, 2006; West, 2012). The mucous membranes of the carina are very sensitive, and stimulation of the carina can trigger a cough reflex. It is important when suctioning a patient that the suction tube is not advanced past the end of the tube as it will then trigger a cough by stimulating the mucosal membrane of the carina. The right main bronchus is more vertical, shorter and wider than the left; as a result of this, an aspirated object or an endotracheal tube that has been advanced too far is more likely to enter the right main bronchus than the left. The bronchi are lined with pseudostratified ciliated columnar epithelium (Tortora and Derrickson, 2006; West, 2012). The bronchi the respiratory system Chapter 10 Clinical application the mucous membranes of the carina are very sensitive, and stimulation of the carina can trigger a cough reflex. It is important when suctioning a patient that the suction tube is not advanced past the end of the endotracheal tube as it will then trigger a cough by stimulating the mucosal membrane of the carina. An aspirated object or an endotracheal tube that has been advanced too far is more likely to enter the right main bronchus than the left; also, if a patient is not responding well to mechanical ventilation it may be that the endotracheal tube has been advanced too far and entered the right main bronchus, thus only ventilating one side of the lungs. Distal to the carina, the primary bronchi divide into smaller bronchithe secondary (lobar) bronchi. These divide into one for each lobe of the lungs, the right side having three lobes and the left having two. The secondary bronchi continue to branch, forming smaller, tertiary bronchi that further divide into bronchioles. The right bronchus gives rise to three secondary (lobar) bronchi, called the superior, middle and inferior secondary lobar bronchi. The left primary bronchus gives rise to the superior and inferior secondary bronchi. These then give rise to tertiary (segmental) bronchi, of which there are 10 in each lung. Each segment of lung tissue supplied by the tertiary bronchus is called the bronchopulmonary segment. These are wrapped in elastic connective tissue and contain a lymphatic vessel, an arteriole, a venule and a branch from a terminal bronchiole. Terminal bronchioles subdivide into microscopic branches called respiratory bronchioles, which then subdivide into alveolar ducts (Tortora and Derrickson, 2006; West, 2012). This leads to a release of adrenaline and noradrenaline, which relax the smooth muscle layer of the lungs. This relaxation of the smooth muscle in the lungs leads to dilatation of the airways. This, in turn, increases the speed at which air reaches the alveoli more quickly and lung ventilation is improved (Tortora and Derrickson, 2006; West, 2012). These cause constriction of the bronchiolar smooth muscle and constriction (tightening) of the bronchioles. Administering adrenaline at this time can be helpful in reversing or limiting the histamine response. Between 3 and 4 years old is considered a critical time for alveoli development, and serious respiratory infections at this age have been linked to adult respiratory disease (Dharmage et al. The alveolus is round and is lined by simple squamous epithelium and is supported by a thin elastic membrane. The alveolar fluid contains surfactant, which is important in reducing its surface tension, thus reducing the tendency of the alveoli to collapse. In premature infants there is a deficiency of this surfactant, which is supplemented to the neonate as part of their management in an effort to improve respiratory function (Merkus, 2003; Tortora and Derrickson, 2006; Wirbelauer and Speer, 2009). As the child grows, the number of collateral ventilator channels increases; this means that if an area is blocked or narrowed, the alveoli can be aerated by another channel. By shunting air about within the lungs, gas exchange can happen without a clear connection to the main airway. The cannels of Lambert connect close-lying bronchioles and alveoli, and the pores of Kohn facilitate interalveolar connections (Dixon et al. The lungs the lungs are a pair (generally) of cone-shaped organs in the thoracic cavity extending from just above the clavicles to the diaphragm. The lungs continue to develop from birth until the age of 8, at which time they are considered anatomically mature. The convex area of the lungs is broadest at the base, which sits on top of the diaphragm. This region houses the hilum, the point at which the bronchi, pulmonary blood vessels, lymphatic vessels and nerves enter and exit the region. Generally on the left, in the medial region of the thorax is the cardiac notch where the heart lies. Owing to the space occupied by the heart, the left lung is about 10% smaller than the right. The respiratory system Chapter 10 the right lung, although larger, is thicker and broader to accommodate the liver, which sits below it (Tortora and Derrickson, 2006; Crawford, 2011a,b; West, 2012). The lungs are separated in the mediastinum; this division can serve a protective function, in that if damage to one lung occurs, then the other may remain intact and functional. The layer between the thoracic cavity and the lungs is called the parietal pleura; the layer that lines the lungs is called the visceral pleura. Between these layers is the pleural cavity, a small space continuing a lubricating fluid to reduce friction and allow adhesion between the layers; this adhesion is known as surface tension (Tortora and Derrickson, 2006). Clinical application Inflammation of the pleural cavity is known as pleurisy or pleuritis, which can be very painful. Inflammation casing a collection of fluid in the pleural space is known as a pleural effusion. A large volume will compress the area and interfere with normal lung expansion, therefore reducing the effectiveness of the lungs. This very thin membrane (about one-sixteenth the diameter of a red blood cell) allows for rapid, passive diffusion of gases. The higher the partial pressure of oxygen PaO2, the more oxygen combines with haemoglobin. The percentage of saturation of haemoglobin expresses the average saturation of haemoglobin with oxygen; however, it can only bind to a maximum of four oxygen molecules. Partial pressure is the greatest influence on oxygen binding to haemoglobin; however, other factors affect this process (Tortora and Derrickson, 2006; Hammer, 2013): Oxygen partial pressure and haemoglobinAcidity (pH). Carbon dioxide can also bind with haemoglobin, also making oxygen available for the cells and creating an increasingly acidic environment. As temperature increases, the amount of oxygen released from haemoglobin is increased; conversely, when the temperature is lowered, less oxygen is made available for cells. Pulmonary blood flow the lungs receive blood via the pulmonary and bronchial arteries. Of this, deoxygenated blood to be oxygenated is carried via the pulmonary arteries, and oxygenated blood to perfuse the walls of the bronchi and bronchioles is carried via the bronchial arteries, direct form the aorta. Pulmonary blood vessels are unique in their ability to constrict in response to localized hypoxia. This vasoconstriction within the lungs allows pulmonary blood to be diverted from poorly ventilated areas of the lungs to well-ventilated areas (Tortora and Derrickson, 2006; West, 2012). As the branching becomes more extensive there are several structural changes of note. The epithelial layer of the primary, secondary and tertiary bronchi changes to a simpler form and becomes nonciliated towards the terminal bronchioles. The cartilage rings disappear in the distal bronchioles; with this there is an increase in smooth muscle encircling the lumen in bands. This can be problematic, as with a muscle spasm, as occurs in an asthma attack, the airway can close off, which is a life-threatening event (Tortora and Derrickson, 2006; West, 2012). This centre is made of three parts: the medullary rhythmicity area in the medulla oblongata, the pneumotaxic area in the pons and the apneustic area, also in the pons. The drive to inhale and exhale is controlled by this area but can be voluntarily controlled. This voluntary control allows us to function under water and to protect our lungs from gases that we know would be harmful. Chemicals can also influence respiration, in particular carbon dioxide and oxygen. Increased levels of carbon dioxide stimulate the respiratory centre into increasing respiratory activity (rapid, deep breathing) in an effort to increase the amount of oxygen in the blood, thus normalizing the balance (Tortora and Derrickson, 2006). When it contracts, the contents of the abdomen move downwards and the lungs expand vertically and horizontally. During this phase the external intercostal muscles elevate and the ribs move forwards. During expiration, usually a passive process due to the elasticity of the lungs and chest wall, air is expelled, carrying with it carbon dioxide and waste products (Tortora and Derrickson, 2006; Hammer, 2013). In older children and adults, the position of the ribs and shape of the thorax assist in the work of breathing. Also, the flatter diaphragm of the infant makes each contraction (breath) less efficient than in an older child (Tortora and Derrickson, 2006; Hammer, 2013).

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Although barium enema can diagnose other pathology of the colon womens health 63031 order ardomon 50 mg fast delivery, assessment of the extracolonic structures is limited and it is no longer considered an examination of choice in most radiology departments womens health rights order 25 mg ardomon with amex. It is inexpensive and widely available; moreover women's health magazine za cheap ardomon 100 mg, the lack of ionizing radiation renders it especially useful in pediatric and pregnant patients breast cancer survival rate buy discount ardomon 100 mg on-line. A high-frequency linear or curvilinear probe can be used depending on patient body habitus women's health zinio discount ardomon 25 mg fast delivery. Although body habitus may limit the examination in obese patients, the converse is true in pediatric and thin patients, where excellent visualization is possible. Imaging is generally performed in transverse, sagittal, and oblique planes in the right lower quadrant, focusing on the site of maximal tenderness. Graded compression, which involves the application of slowly increasing and sustained pressure, may be used. This technique can displace overlying normal small bowel loops, allowing visualization of the appendix. Another option involves tracing the ascending colon inferiorly to the cecum; this allows identification of the appendix at the cecal pole. The inflamed appendix will appear as an aperistaltic, blind-ending tubular structure in the right lower quadrant. The walls will become more indistinct as inflammation proceeds to ischemia and infarction, with decreasing flow identified on color Doppler ultrasound. Defects in the wall may appear, with perforation and pockets of air, and fluid may be seen in the adjacent mesenteric fat. An appendicolith may be identified within the lumen as a rounded echogenic focus with associated distal shadowing. The fat surrounding the appendix may appear prominent and echogenic because of inflammation. The adjacent distal ileum and cecum may appear thick-walled and edematous secondary to the local inflammatory process. Coronal T2-weighted fast spin-echo and axial fat-saturated T2-weighted fast spin-echo images show an edematous, thick-walled, distended, fluid-filled appendix. There is adjacent periappendiceal inflammatory stranding, consistent with appendicitis. It is readily available and can be performed quickly once the decision to image has been taken. Oral contrast provides distention and opacification of the small bowel, thereby aiding identification of an appendix that is not filled with contrast and improving detection of intra-abdominal fluid collections. Disadvantages of oral contrast are the delay in scanning while waiting for the contrast to reach the distal small bowel and cecum (usually 45 to 60 minutes) and also the potential for aspiration of gastric contents. Intravenous contrast allows assessment of the appendiceal wall for enhancement while also opacifying adjacent blood vessels, which can be confused with the appendix. Intravenous contrast can also help in the identification of the appendix in patients with a paucity of intra-abdominal fat and aids in the diagnosis of mild periappendiceal fat stranding. Disadvantages of intravenous contrast include the potential for contrast reactions and increased cost. Rectal contrast is given less frequently than either oral or intravenous contrast. It allows rapid opacification of the colon and cecum, aiding identification of the cecal pole and adjacent appendix. However, poor patient acceptance due to patient discomfort is a major disadvantage and limits its use. There will be adjacent periappendiceal fat stranding and fluid; however, this may be absent in very early cases. An appendiceal diameter of greater than 6 mm is suggestive of appendicitis; however, up to 40% of normal appendixes can have diameters greater than 6 mm. An indistinct wall or focal areas of nonenhancement may indicate ischemia and infarction, while signs of perforation include extraluminal air and periappendiceal collections. This was diagnosed as a focal deposit of endometriosis at histopathologic analysis following surgical resection. T2-weighted fast spin-echo sequences and fat-suppressed T2-weighted images are the mainstay diagnostic sequences performed. Periappendiceal fat stranding will appear hyperintense relative to normal fat on T2-weighted imaging and is accentuated on fat-suppressed T2-weighted images. Time-of-flight imaging may help to distinguish an adjacent ovarian vein from the appendix in cases where the appendix is not well visualized. Diffusion-weighted imaging has been shown to be useful in the diagnosis of acute appendicits. Epiploic appendagitis: the classic appearance is of a rounded fat density/fat signal area adjacent to the colon with surrounding inflammatory stranding. Chronic appendicitis: this may be secondary to partial or intermittent obstruction of the appendiceal lumen. Management/Clinical Issues Acute appendicitis is an important radiologic diagnosis and imaging aids prompt surgical decision making and treatment. Attempts should be made to visualize the appendix and exclude appendicitis on all cross-sectional imaging studies performed for abdominal pain. If acute appendicitis is diagnosed, the referring physician should be contacted immediately to facilitate surgical management without unnecessary delay. Periappendieal fluid collections and/or abscesses may require image-guided percutaneous catheter drainage. A fluid-filled, distended appendix with surrounding inflammation is the hallmark of diagnosis. Ultrasound is most useful in thin patients and pediatric and pregnant patient populations. Clinical policy: critical issues in the evaluation and management of emergency department patients with suspected appendicitis. Appendiceal Carcinoid Tumors Definition Gastrointestinal carcinoid tumors arise from cells of the neuroendocrine system, occurring most frequently within the midgut. The appendix is the most common site for gastrointestinal carcinoid, followed by the small bowel and rectum. Clinical Features Carcinoid tumors of the appendix can be discovered in patients of any age. However, patients are typically younger than those presenting with other tumors of the appendix or other patients with gastrointestinal carcinoid tumors. Appendiceal carcinoids are slow-growing tumors that are usually incidentally identified at the time of appendectomy or surgery for other abdominal pathology. For example, the tumors can obstruct the appendiceal lumen, leading to appendicitis, with identification of the tumor at the time of resection. Appendiceal carcinoid tumors are slightly more common in women, although it is unclear if this is because of the increased rate of pelvic surgery in young women relative to men. Carcinoid syndrome-characterized by flushing, diarrhea, and less commonly cardiac failure and bronchoconstriction-is caused by the release of vasoactive substances from carcinoid tumors and is rarely associated with appendiceal carcinoid tumors, generally not occurring until hepatic metastases are present. Pathophysiology Carcinoids are well-differentiated neuroendocrine tumors, usually appearing as small yellow or white nodules within the wall of the appendix. Approximately two thirds of tumors occur at the tip or in the distal third of the appendix. Lesions can invade locally along the mesoappendix and then to local mesenteric nodes, with further spread to the small bowel mesentery. Goblet cell carcinomas are a rare subtype of carcinoid tumors that show mixed endocrine and glandular differentiation. These lesions are more aggressive than regular carcinoid tumors but less aggressive than appendiceal adenocarcinoma. Imaging Features Because carcinoid tumors are usually small at the time of diagnosis, abdominal radiographs and barium studies are rarely helpful. Ultrasound is unlikely to be diagnostic; however, if the lesion has obstructed the appendiceal lumen, features of appendicitis may be present. If the tumor has obstructed the lumen of the appendix, resulting in appendicitis, it is unlikely to be visualized as separate from the inflamed appendix and adjacent mesenteric fat. Tumor invasion into the mesoappendix may appear similar to the inflammatory stranding seen in appendicitis. The surrounding mesenteric fat should be assessed for locally enlarged lymph nodes. Metastatic disease may extend to the base of the small bowel mesentery and appear as an irregular soft tissue mass that often shows foci of calcification. After the mesentery, metastases usually go to the liver, typically appearing as multiple arterially enhancing lesions. These examinations can be useful in the characterization of incidental lesions identified within the appendix, but they also have a role in assessing for the presence of metastatic disease, which will generally also accumulate the radioisotope. Differential Diagnosis Appendicitis: the appendix will usually appear diffusely thick-walled rather than focally thickened. Management/Clinical Issues Appendiceal carcinoid tumors have a more benign course than carcinoid tumors within the remainder of the gastrointestinal tract, and metastatic disease is rare. Surgical resection is the main treatment and is primarily based on the size of the tumor at the time of diagnosis, with appendectomy usually considered curative for tumors smaller than 2 cm. Right hemicolectomy is usually reserved for patients with tumors greater than 2 cm, tumor invasion into the mesoappendix, lymphatic system, or lymph nodes, and tumors with positive margins or aggressive features at histopathologic examination. Usually incidentally discovered at imaging, at surgery, or on histopathologic assessment of the resected appendix. Appendiceal Mucinous Cystadenoma Definition Mucinous cystadenomas are benign mucin-producing epithelial neoplasms arising in the appendix and, after carcinoid tumors, are the second most common tumor of the appendix. Clinical Features Mucinous cystadenomas are the most common cause of mucoceles, which arise when the appendiceal lumen becomes chronically obstructed and the appendix slowly fills with mucin. Other causes of mucoceles include appendicoliths, scarring (usually related to previous inflammation), or other appendiceal or cecal epithelial neoplasms. A mucocele may present with low-grade right-lower-quadrant pain or discomfort or as an incidental finding of a mass on clinical examination or imaging. Acute presentations are usually secondary to superinfection, the result mass effect on adjacent structures, or due to intussusception of the mucocele into the cecum, causing bowel obstruction. Perforation of the mucocele can also occur, leading to leakage of gelatinous material into the peritoneal cavity, called pseudomyxoma peritonei. When this is associated with the benign mucinous cystadenoma or another benign etiology, it carries a good prognosis after removal of the mucin. Pseudomyxoma peritonei, however, is more commonly associated with appendiceal mucinous cystadenocarcinoma and carries a worse prognosis, since it has an insidious progression, often requiring multiple debulking surgeries. Appendectomy or right hemicolectomy in the treatment of appendiceal carcinoid tumors Primary neoplasms of the appendix: radiologic spectrum of disease with pathologic correlation. Longitudinal ultrasound image of the pelvis (A) shows an elongated cystic lesion with internal echoes immediately superior to the bladder. Pathophysiology Mucinous cystadenomas of the appendix are benign epithelial lesions; the corresponding malignant lesion is an appendiceal mucinous cystadenocarcinoma. It may not be possible to pathologically classify a small number of tumors, which can be categorized as mucinous tumors of uncertain malignant potential. Imaging Features Imaging of mucinous cystadenomas relies on the diagnosis of the resultant mucocele. Abdominal radiographs may show a well-circumscribed soft tissue density in the right lower quadrant. Curvilinear calcifications within the wall, while rarely identified on plain radiographs, support the diagnosis. At barium enema, the appendiceal lumen will not fill and the mucocele may exert local mass effect on the cecum, causing a smooth indentation on its medial wall. A segment of normal nondistended appendix may be visible between the mucocele and the cecum. The mucocele may indent the cecum or can invaginate through the appendiceal orifice into the cecum. If the mucocele obstructs the cecum or ileocecal valve, there may be resultant small bowel obstruction. Air within the mucocele, thickening of the appendiceal wall, or stranding within the adjacent fat all indicate possible underlying superinfection and may be indistinguishable from simple appendicitis. The mucocele can also undergo torsion, leading to infarction and perforation; rarely, it may be the lead point for intussusception. Pseudomyxoma peritonei will appear as multiple loculated fluid collections throughout the peritoneal cavity. Typically these will have mass effect on the adjacent organs, giving the classic scalloped appearance to the liver and spleen. The base of the appendix is irregularly thickened (arrow in B), with stranding extending into the adjacent mesenteric fat. At histopathologic examination, this proved to be a mucocele secondary to a mucinous cystadenocarcinoma. Differential Diagnosis Perforated appendicitis with abscess formation: There will typically be more inflammatory stranding than with a mucocele. Hydrosalpinx: Cross-sectional imaging should demonstrate a connection between the mucocele and the cecum. Because of the risk of perforation at the time of surgery, the radiologist should warn the referring physician if a mucocele is suspected radiologically. Mucinous cystadenocarcinomas carry a worse prognosis and have an increased risk of pseudomyxoma peritonei. Irregular thick walls and adjacent mesenteric inflammatory stranding suggest superinfection or malignant transformation. Further Reading consists of more than 50% of extracellular mucin, it is classified as a mucinous adenocarcinoma, which is now considered to be the same lesion as mucinous cystadencarcioma. Imaging Features Abdominal radiographs are rarely helpful in the diagnosis of adenocarcinoma of the appendix. If the tumor has invaded the adjacent cecum or small bowel, bowel obstruction may occur.

The margins of the vessel are indistinct pregnancy journal ideas safe 25 mg ardomon, suggesting the presence of infiltrative tumor in the surrounding parenchyma womens health 6 week abs buy ardomon without a prescription. Color and spectral Doppler ultrasound (C) show a turbulent arterialized flow pattern within the right portal vein thrombus menstrual wipes 50 mg ardomon buy mastercard. Thus menopause water retention buy discount ardomon 25 mg on line, because the parenchymal tumor may be difficult to visualize women's mental health issues 50 mg ardomon purchase with amex, a high index of suspicion is needed. Tumoral thrombosis usually has reduced diffusivity compared with background liver and appears hyperintense on diffusion-weighted images. Recent studies suggest that the average apparent diffusion coefficient in tumoral thrombosis is lower than that in bland thrombosis. Apparent diffusion coefficient values in the two conditions overlap, however, and a diffusion-weighted image does not by itself permit reliable differentiation of tumoral versus bland thrombosis. Patients may have tumoral thrombosis in some vessels or vessel segments and bland thrombosis in others; imaging shows the corresponding features in the affected vessels. Biliary dilatation: Dilated tubes adjacent to patent portal veins, markedly hyperintense at T2-weighted imaging. Pitfalls and Mimics Although bland thrombosis usually does not expand the caliber of a vein to the same degree as tumor thrombus, bland thrombosis may occur in a portal vein already dilated by chronic portal hypertension, which may be misinterpreted as tumoral expansion. Although arterial-phase hyperenhancement is characteristic of tumoral thrombosis, the degree of enhancement is variable. Notice innumerable arterially enhancing foci throughout the liver consistent with multifocal infiltrative hepatocellular carcinoma. Occasionally the enhancement matches that of surrounding liver on all vascular phases. Tumoral thrombosis may be missed in these cases because the abnormal vessel blends into the surrounding parenchyma and goes unnoticed. Long-standing malignant thrombosis of a portal vein branch may lead to parenchymal atrophy along the corresponding vascular distribution as well as cavernous transformation, similar in appearance to the atrophy and cavernous transformation associated with bland portal vein thrombosis. Management/Clinical Issues the distinction of bland portal vein thrombosis and tumoral thrombosis is critical because of the profound differences in prognostic and treatment implications of the two entities. Image-guided percutaneous biopsy is reserved for cases that cannot be diagnosed reliably by noninvasive imaging. Careful inspection of the arterial-phase image (B) reveals tiny intraluminal arteries (arrow) feeding the thrombus in the left branch of the portal vein ("threads and streaks" sign), consistent with intraportal invasion of hepatocellular carcinoma. Parenchymal heterogeneity in conjunction with tumoral thrombosis is suspicious for infiltrative cancer. Follow-up imaging studies revealed diffusely infiltrative cancer throughout the hepatic parenchyma, not well visualized in the current study. Systemic chemotherapy, external beam radiation, hepatic resection, and experimental therapies can be attempted, but treatment is usually directed toward palliation. Coronal reformatted images of the liver in the arterial phase show numerous intraluminal arteries within the portal vein (white arrow in A), middle hepatic vein (black arrow in A), and inferior vena cava (black arrow in B). Intraluminal neovascularity and enhancing soft tissue within the lumen of a vein are diagnostic of tumoral thrombosis; venous expansion, poorly marginated vein walls, contiguity with parenchymal tumor, and intraluminal diffusion-weighted hyperintensity are suggestive but not diagnostic. Heterogeneous liver parenchyma in conjunction with tumoral thrombosis suggests the presence of infiltrative parenchymal tumor. Tumoral thrombosis indicates poor prognosis and is a contraindication to liver transplantation. Portal vein thrombosis: Prevalence, patient characteristics and lifetime risk: a population study based on 23,796 consecutive autopsies. Diagnosis of benign and malignant portal vein thrombosis in cirrhotic patients with hepatocellular carcinoma: color Doppler, contrast-enhanced, and fine-needle biopsy. Sirlin Definition Veno-occlusive disorders involve the obstruction of hepatic venous outflow. Obstructions can occur in the suprahepatic inferior vena cava or hepatic veins (Budd-Chiari syndrome) or in the terminal hepatic venules or sinusoids (sinusoidal obstruction syndrome). Budd-Chiari syndrome may be primary (caused by intraluminal thrombosis; 75% of cases) or secondary (caused by invasion or compression by a tumor; 25% of cases). Demographic and Clinical Features General Features Primary Budd-Chiari syndrome and sinusoidal obstruction syndrome have similar clinical manifestations, such as abdominal pain, hepatomegaly, ascites, and fluid retention. In contrast with other hepatic disorders, these disorders are unique in that they may cause portal hypertension prior to overt hepatic parenchymal dysfunction. Primary Budd-Chiari syndrome and sinusoidal obstruction syndrome can occur in all ethnicities and at any age. Primary Budd-Chiari Syndrome Primary Budd-Chiari syndrome has a prevalence of about 1 in 1 million individuals, with an annual incidence of about 1 in 10 million. In western nations, the most common predisposing conditions include myeloproliferative and other hematologic disorders, pregnancy, postpartum state, use of oral contraceptives, and genetic hypercoagulability disorders. Membranous (congenital) webs of the inferior vena cava are the most common cause of Budd-Chiari syndrome in Asia. The clinical picture in Budd-Chiari syndrome is defined by the location, extent, and acuteness of the venous outflow obstruction and on the remaining primary and collateral circulation. In the acute and subacute forms, portal hypertension is the most common manifestation. In the chronic form (80%), portal hypertension, hepatomegaly, jaundice, and progression to cirrhosis (20%) and end-stage liver disease can be observed; renal impairment is observed in 50% of cases. The classic triad of Budd-Chiari syndrome (abdominal pain, ascites, and hepatomegaly) is observed most commonly in the fulminant and acute forms. In addition to hepatic venous or inferior vena cava occlusion, 10% to 20% of affected patients develop superimposed obstruction of the extrahepatic portal vein, presumably as a consequence of blood stasis in the portal vein in the setting of a hypercoagulable state. Prognosis depends not only on the severity of the Budd-Chiari syndrome but also on the underlying predisposing condition or conditions. Overall, the average 10-year survival rate in patients with primary Budd-Chiari syndrome is about 70%. Sinusoidal Obstruction Syndrome Sinusoidal obstruction syndrome is a rare toxin-mediated condition occurring most commonly as a complication of hematopoietic stem cell transplantation and less commonly as a complication of solid organ transplantation. It can also occur after chemotherapy in nontransplant settings, as a result of high-dose radiation therapy, and from accidental poisoning with food, drinks, or herbal medications contaminated with pyrrolizidine alkaloids. The incidence and natural history of sinusoidal obstruction syndrome are variable and depend on its cause and other factors. After stem cell transplantation, the incidence of sinusoidal obstruction syndrome ranges from 5% to 70% depending on the conditioning (preparatory) regimen given prior to the transplant, patient factors, and criteria used to diagnose the condition. Sinusoidal obstruction syndrome usually occurs within 3 weeks after transplant with tender hepatomegaly, ascites, fluid retention, and hyperbilirubinemia. The condition may resolve completely within 2 to 3 weeks or advance rapidly to multiorgan failure (renal failure, encephalopathy, and pulmonary insufficiency) and death. Its clinical relevance is that it may increase morbidity and liver failure after the surgical resection of hepatic metastases. Therefore identification of sinusoidal obstruction syndrome is important for determining the timing of hepatic resection and the planning of further chemotherapy. Currently the diagnosis of sinusoidal obstruction syndrome is based on clinical and laboratory findings, with liver biopsy reserved for equivocal cases. If the results of recent investigations are confirmed, the role of imaging in the evaluation and management of this disorder may expand. Pathophysiology General Features Sinusoidal obstruction syndrome and Budd-Chiari syndrome have similar pathophysiologic features. In both disorders, venous obstruction prevents blood from flowing out of the liver, leading to hepatic congestion, blood stagnation, and a subsequent increase in hepatic sinusoidal and portal vein pressures. Portal hypertension ensues and is associated with development of protein-rich ascites and the formation of collateral venous channels. Histologically, stagnant red blood cells distend and dilate the centrilobular sinusoids, causing compression of surrounding parenchyma and loss of hepatocytes. The red blood cells eventually extravasate into the space of Disse and replace the disappearing hepatocytes. Blood-filled lakes may develop in the centrilobular zone, with loss of recognizable hepatic parenchyma. At the periphery of the injured areas, cholestatic changes and hemosiderin-laden macrophages may be present, but there is little if any inflammation. Primary Budd-Chiari Syndrome Because primary Budd-Chiari syndrome is caused by intraluminal thrombosis, thrombus is characteristically present within central veins at histologic examination. In chronic Budd-Chiari syndrome, reduced hepatic perfusion leads to centrilobular necrosis, followed by progressive fibrosis. The fibrosis forms bridges between central veins, characteristically sparing the portal tracts and eventually resulting in a "venocentric cirrhosis" or "reversed-lobulation" pattern of cirrhosis. Large regenerative nodules develop in arterialized areas of the liver that are deprived of portal perfusion but well drained by hepatic venous collaterals. These nodules are multiple, variable in size (diameters ranging from less than 5 mm to more than 4 cm), and benign; they do not undergo malignant transformation. These liver abnormalities may be uneven in distribution depending on the sites of venous obstruction; areas of the liver drained by unoccluded hepatic veins typically undergo compensatory hypertrophy. If all major hepatic veins are occluded but the inferior vena cava remains patent, the central portion of the liver (mainly the caudate lobe) characteristically hypertrophies, in part owing to preserved venous drainage through multiple small caudate lobe veins that enter the cava directly and in part from preferential portal perfusion of central versus peripheral hepatic parenchyma. Renal failure due to the activation of the renin-angiotensin pathways and excess sodium retention may also occur. The injured sinusoidal endothelial cells dehisce into the sinusoidal lumen, embolize downstream, and cause nonthrombotic mechanical occlusion of hepatic sinusoids and terminal hepatic venules. The endothelial injury also triggers the coagulation cascade and induces a local hypercoagulable state, leading to fibrin deposition within the lumen; this may exacerbate the occlusive process. Although fibrin deposits may be evident, frank thrombus within the central veins is rare, in distinction to primary Budd-Chiari syndrome, in which it is characteristic. Liver involvement in sinusoidal obstruction syndrome tends to be diffuse and uniform. Imaging Features Budd-Chiari Syndrome Imaging plays a fundamental role in the evaluation and management of Budd-Chiari syndrome. Key imaging findings depend on the acuity of the disorder and the imaging modality. Liver edema may cause smooth extrinsic narrowing of nonthrombosed inferior vena cava and hepatic veins. This temporal pattern has been attributed to marked elevation of parenchymal pressure with corresponding hypoperfusion and slow flow in the periphery of the liver. Additionally, owing to the stagnation of contrast material within the sinusoids, the enhancing portions of the parenchyma may have a "nutmeg," mottled, or mosaic appearance in the arterial and early venous phases. Conventional catheter angiography may reveal smooth narrowing of the nonthrombosed inferior vena cava and hepatic veins, which is attributable to extrinsic compression of these vessels. Imaging of chronic Budd-Chiari syndrome may show compensatory hypertrophy of the caudate lobe and relative atrophy of the periphery. Despite progression to cirrhosis, the affected liver tends to be large and without the surface nodularity typically seen in other forms of cirrhosis. Ultrasound may reveal hyperechogenic fibrous cords or membranes replacing the hepatic veins as well as multiple intrahepatic collateral vessels around the occluded veins. Color Doppler ultrasound may show "bicolored hepatic veins," reflecting opposing flow directions within adjacent perivenous collateral channels. These small collateral vessels have a characteristic "spider web" appearance at conventional venography. The enhancement differences between the caudate lobe and the periphery of the liver observed in acute Budd-Chiari syndrome become less noticeable in chronic stages because of the development of intrahepatic collateral channels. The nodules may grow and be mistaken for hepatocellular carcinoma or other malignant nodules. The correct diagnosis can usually be established by the clinical setting (Budd-Chiari syndrome), characteristic unenhanced imaging features, and fading to isoenhancement rather than washout to hypoenhancement in venous phases. Doppler ultrasound may show bidirectional or reversed flow in hepatic veins as well as an elevated hepatic arterial resistive index (equal to or greater than 0. The parenchyma enhances heterogeneously owing to arterioportal shunting, which develops in response to the sinusoidal obstruction. Differential Diagnosis Cirrhosis due primary Budd-Chiari syndrome versus cirrhosis due to other causes: In most forms of cirrhosis, the liver has a nodular contour and is small. Regenerative nodules in primary Budd-Chiari syndrome versus regenerative nodules in other forms of cirrhosis: Regenerative nodules in other forms of cirrhosis are usually smaller and without arterial enhancement. Regenerative nodules in primary Budd-Chiari syndrome versus hepatocellular carcinoma nodules: Hepatocellular carcinoma nodules tend to wash out to hypoenhancement in venous phases. Management/Clinical Issues Budd-Chiari Syndrome Treatment for Budd-Chiari syndrome is aimed at alleviating hepatic congestion. It includes supportive medical therapy (diuretics, sodium restriction) and correction of hemodynamic abnormalities (anticoagulation medications, thrombolytic treatment, angioplasty with stent placement, transjugular intrahepatic portosystemic shunt, and venous shunt surgery). Liver transplantation is indicated in fulminant liver failure, failure of shunts, or progression to end-stage liver disease. Patients with cirrhosis should be considered for hepatocellular carcinoma surveillance. Fat-saturated T1-weighted images were acquired before contrast administration (A) and in the arterial (B), portal venous (C), and 3-minute delayed (D) phases after the administration of extracellular contrast. The nodule hyperenhances in the arterial phase (arrow in B) and subsequently fades to isointensity. The nodule is hyperintense on T1-weighted images (A and E) and isointense on T2-weighted (F) and diffusion-weighted images acquired with b values of b = 0 (G) and 500 (H) s/mm2. Findings are consistent with but not diagnostic of sinusoidal obstruction syndrome. Sinusoidal Obstruction Syndrome Therapy for sinusoidal obstruction syndrome is primarily supportive and includes alleviation of pain and maintenance of intravascular volume and renal perfusion while limiting third-space fluid accumulation. Key Points Budd-Chiari syndrome and sinusoidal obstruction syndrome are veno-occlusive diseases that affect hepatic venous outflow. Sinusoidal obstruction syndrome associated with stem cell transplantation usually resolves spontaneously or advances rapidly to multiorgan failure and death; chronic liver disease with progression to cirrhosis usually does not occur.

As the infant grows menopause in men purchase ardomon with a mastercard, the skin increases in strength due to the hardening of the keratinized cells women's health center akron city hospital ardomon 100 mg buy on-line. The transepidermal lipid barrier is effective at birth in the mature infant womens health obgyn purchase 25 mg ardomon mastercard, thus offering immediate protection from the environment (Hoeger and Enzmann womens health july 2013 ardomon 50 mg for sale, 2002) women's health fitness tips buy cheapest ardomon. There are many substances that penetrate the skin, such as fat-soluble vitamins, steroids, carbon dioxide, oxygen, solvents, resins from plants, salts from heavy metals (lead), selected drugs and drug penetration enhancers. Some of these are helpful and necessary but may also be toxic to the human body in undesired quantities. The water-resistant nature of the skin, due to the presence of glycolipids in the epidermis, blocks most of the diffusion of water and water-soluble substances between the cells (Tortora and Derrickson, 2009). This prevents the drying out of the tissues and internal organs and the gain of water to and loss from the body through the skin. In the premature infant, transdermal water loss is significant in terms of overall wellbeing. A small of amount of water will be lost through the epidermis, and long-term submersion in water (not salt water) will cause the body to swell; immersion in salt water will cause the skin to dehydrate as water is drawn out of the body, so the skin is not entirely waterproof. At birth the skin is sterile, but it quickly colonizes with florabacteria and fungi from the birth canal, environment and human contact. This initial colonization may not be reflective of the longer term pattern of colonization and representative of the normal skin flora for that individual. This, along with the smaller body surface area of infants, less developed ecological environment and the need to be handled by their carers, is thought to increase the ability of pathogens to spread (Carr and Kloos, 1977). By puberty there is an increase in the propionibacterium acne which acts on sebum, thus producing an inflammatory response resulting in acne (Mims et al. The dendritic cells and the macrophages play an important role in the immune system. The macrophages constitute the second line of defence to bacteria and viruses that have successfully penetrated the epidermis. Thermoregulation the skin has a direct role in thermoregulation for the infant and child. Damage to this skin function in severe conditions can lead to collapse in the child. The human being maintains their core temperature within narrow parameters, and the metabolic rate of the human body decreases with age. The temperature of the fetus is higher than that of its mother due it having a higher metabolic rate, and it passes the heat energy to its mother through the placental interface and the amniotic fluid (Power, 1989). As soon as the baby is born it is essential that it can generate heat to deal with the hostile environment it has been born into where the ambient temperature is lower that the in-utero temperature. Heat Chapter 19 the skin Peripheral vasoconstriction Hypoglycaemia Anaerobic metabolism occurs. Heat generation in the newborn infant occurs through shivering and non-shivering thermogenesis. However, the shivering response of the newborn is immature owing to immaturity of the musculature system, so this is unable to achieve the desired response. Therefore, it is important to dry the baby at birth and maintain a thermoneutral environment. It is the presence of brown fat in non-shivering thermogenesis that enables heat to be generated. Brown fat has a plentiful supply of mitochondria, blood and a well-developed sympathetic nerve system (Asakura, 2004). There is an increase in noradrenaline in the presence of cold, and this acts on brown fat, causing lipolysis. This breaks down the brown fat into free fatty acids, producing heat in the process and thus raising the core temperature due to rich blood supply of brown fat. The newborn has significantly more sweat glands than the adult does, but it does not have the same ability to sweat and so is unable to maintain its core temperature by this mechanism. The ability to sweat does not occur until the infant is 2 weeks old, so they cannot lose heat through this mechanism. The more immature the infant is, the greater the insensible water loss is through their skin, and thus the greater potential for temperature loss as the evaporation of water requires energy. Infants are unable to constrict their surface blood vessels, unlike older children, so cannot conserve heat in this manner. As the infant matures, the neural network in the skin provides an accurate measure of the ambient temperature. This is done by the activation of the heat receptor in the dermis, which then passes a signal along the sensory nerve pathway to the hypothalamus. This will then either initiate the shivering reflex or deactivate the sweating mechanism. The thermoregulatory function in children is immature, and because children also have a large body surface area they are at an increased risk of hypothermia. Sensation There is a rich supply of receptors in the skin that are part of the nervous system. This is important as the primary method of bonding between the infant and its mother should be through skin-to-skin contact. It is thought there may be some analgesic effect through skin-to-skin contact in the young infant (Gray et al. Pacinian corpuscles, which are located deep in the dermis, alert us to increased pressure from direct contact. Hair follicle receptors are also present that alerts us to hair being pulled or air currents. The number of receptors in the lips, genitals and finger tips are greater than found in the rest of the body. Vitamin D3 (cholecalciferol) is an essential component in calcium regulation in the body and impacts on the serum calcium level and the bone deposition. Enzymes present in the liver and kidneys then alter the molecules to produce the active form of vitamin D. This hormone, calcitriol, is essential for the absorption of calcium into the body. There are limited amounts of waste substances excreted through the skin, such as water, sodium, urea, uric acid and ammonia. There is high transepidermal water loss in the preterm baby, and this may be up to 10 times greater than in a term infant. The skin has the ability to absorb substances both directly from the environment, such as carbon dioxide and heavy metals, and from the direct application to the skin in the form of topical medication. The skin does a very effective job at communicating many important pathologies that are occurring both locally and deeper within the body. Observations of the skin will involve the colour, presence of rashes or lesions, temperature, texture, and breaks in its continuity. It is the primary method of identification as it is highly visible and thus has both aesthetic and cultural significance. Conclusion In this chapter the anatomy and physiology of the skin has been examined and its functions identified. A good understanding of this is a prerequisite to the provision of safe and effective nursing care of the infant and child. The integumentary system consists of or, which includes the, and the. The functions of the skin are, and. The innermost layer of the epidermis is the and the outermost layer is the. The muscle contracts when, forcing the hair to . The glands are holocrine glands that discharge a secretion into hair follicles. There are three types of sweat glands: sweat glands, and sweat glands. Case study Atopic eczema is a chronic, relapsing inflammatory condition of the skin. Currently, there is no cure for atopic eczema, but it may often disappear by adolescence. In order to be classified as atopic eczema the child must have an itchy skin condition and any three of the following (British Association of Dermatologists, 2009): the skin Chapter 19 history of itch in the skin creases/folds or cheeks of the face; history of asthma or hay fever; dry skin in the last year; visible flexural eczema or on the cheeks, forehead and outer limbs in children under 4 years; Onset in the last two years of life. However, the aetiology is multifactorial, with the environment, immunological and physical factors all possibilities in its development. The epidermis already has an inability to retain water, so fluid leaks from the cells. As a result of the inflammatory response, erythema and oedema occur in the epidermis. There is increased blood flow, and this in turn causes the white blood cells to leak into the dermis. What do you think are the important factors in managing a child with atopic eczema to ensure the quality of their life is not affected by their eczema What practical help might a family require if they have a child with atopic eczema The infant or child will present with pruritus, dry, scaly skin on the cheeks, flexures of the elbows and behind the knees. The aim of the treatment of a child with atopic eczema is to hydrate the skin, reduce inflammation, and promote comfort to maintain a normal quality of life. This will include daily skin care regimes-bathing, use of emollients, topical steroids during flare ups and antihistamines to provide relief from pruritus. A full nutritional assessment should be undertaken on the initial consultation, including weighting and height of the child, to identify any possible food triggers. Treatments are time consuming and repetitive, yet it is essential that good compliance is achieved so motivation is required. There may be many restriction on the family in terms of managing laundry, preparing food, restrictions on having a pet, sleep deprivation, behavioural problems due to the child being eased or bullied, and having to deal with the psychological impact of an altered body image combined with parental guilt and anguish. The practical advice the family need are to avoid extremes of temperature, minimise skin damage from scratching by keeping finger nails short, avoid biological detergents and fabric softener. Synthesis of this vitamin begins in the skin Cell found in the epidermal layer A flattened cell Pigment producing cell in epidermal layer 12. Term for the skin and its appendages Lower layer of skin Secondary hair Uppermost layer of the skin 7. Function of the skin Conditions the following table contains a list of conditions. The skin Chapter 19 Condition Burns Psoriasis Head lice Dermatitis Acne Your notes Glossary Absorption: intake of fluid or a substance into the tissues. Arrector pilli muscle: bundle of smooth muscle associated with the hair follicle that inserts into the hair follicle via the dermal shaft. Calcitonin: Cerumen: Collagen: a hormone that assists in the metabolism of calcium. Dermis: the middle layer of the skin, composed mainly of connective tissue and consists of two layersthe papillary and the reticular layers. Epidermis: the superficial layer of the skin that covers the entire body and is composed of stratified keratinized squamous epithelium. Excretion: Hair: elimination of waste products from the body consists of vellus and terminal hair that is produced by the hair follicle. Keratinocyte: Lanugo: down-like hair that covers the fetus until shortly after birth. Stratum lucidium: the skin the most superficial layer of the epidermis and often referred to as the horny consists of five layers of flat dead cells. Stratum granulsosum: Stratum spinosum: a layer that has tightly packed keratinocytes that have spine-like projections. Sebum: Thermoreceptor: Vernix: consists of secretory epithelial cells derived from the same tissues as hair an oily substance produced by the sebaceous glands. Afferent, arteriole, creatinine, diuretic, efferent, haematuria, interstitial, ion, medulla, cortex, solute, urea, urinalysis, urine, vasopressin. Aldosterone, angiotensin, calyx, collecting duct, cortex, glomerulus, kidney, loop of Henle, medulla, nephron, parenchyma, pelvis, pyramid, reabsorption, renin, secretion, ureter, urethra. Although facilitated diffusion is the commonest form of protein-mediated transport across the cell membrane, it tends to be overshadowed by active transport. Calcium pump, cytoskeleton, glycoprotein, nucleoplasm, organelle, passive transport, prokaryote, protein. In open or large wounds, the process of granulation occurs using granulation tissue which is perfused, fibrous connective tissue, which replaces the initial fibrin clot. An adult has a total of 206 bones which are joined to ligaments and tendons, whilst babies, at birth, have 270 bones. The most common function of connective tissue is to act as the framework on which the epithelial cells gather to form the organs of the body. Vasoconstriction occurs as a result of vascular spasm which causes the smooth muscle of the blood vessel wall to contract, which in turn constricts the small blood vessels. This process is a result of the sympathetic nervous system restricting blood flow. The aorta is the largest artery in the body and oxygenated blood leaves the heart through it. Blood pressure is maintained by means of baroreceptors which are found in the arch of the aorta and the carotid sinus. When blood pressure increases, this sends signals to the cardioregulatory centre, which increases parasympathetic activity to the heart, reducing heart rate and inhibiting sympathetic activity to the blood vessels. Blood returning from the body enters the heart via the inferior and superior vena cavae, into the right atrium across the tricuspid valve to the right ventricle and then leaves to go to the lungs via the pulmonary artery. Many of the structures within the heart are known by more than one name; complete the following: right atrioventricular valve = tricuspid valve left atrioventricular valve = bicuspid valve atrioventricular bundle = bundle of His.

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