Katja Ingrid Elbert-Avila, MD

• Associate Professor of Medicine

https://medicine.duke.edu/faculty/katja-ingrid-elbert-avila-md

It transmits chemical signals from outside the cell erectile dysfunction at age 50 discount 100/60 mg viagra with dapoxetine visa, through the cell membrane toward the cytoplasm erectile dysfunction images discount viagra with dapoxetine online master card, and then into the nucleus impotence injections medications viagra with dapoxetine 50/30 mg visa. Tyrosine kinase is an enzyme that acts as a sort of "on" or "off" switch that regulates many cellular functions impotence quitting smoking order viagra with dapoxetine with american express. Mutations can turn tyrosine kinases in a nonstop functional state that erectile dysfunction medications side effects cheap viagra with dapoxetine 50/30 mg with amex, under specific circumstances, may lead to the initiation or progression of cancer. More recently this pathway has also been studied in the context of the wound healing process and fibrosis. It was able to inhibit fibroblast proliferation and collagen deposition in vitro and in vivo, but when it was evaluated in a clinical trial, no benefit in slowing disease progression was found. It was found to attenuate fibrosis by reducing the expression of profibrotic factors and by decreasing collagen deposition. The safety profile of the explored drug is already known so that the risk of adverse events is reduced. In addition, the mechanism of action of a repositioned drug is known and can be used in those diseases where a similar mechanism is involved. Today, computational strategies are available to explore the mechanisms of action of approved drugs and to match them with cellular and/or molecular targets involved in the pathogenesis of virtually any disease. The secondary endpoints were represented by the time to the first exacerbation and the change in total St. This analysis also demonstrated a positive trend toward a reduction in risk for all-cause and respiratory mortality. This metabolite is eliminated through the liver and feces, while the excretion in the urine is minimal. In the pooled data analysis, diarrhea was the most frequent adverse event in the nintedanib group (61. In general, adverse events are reversible with reducing the dose of nintedanib or stopping the treatment, without clinically significant consequences. The pathophysiologic mechanism of drug-induced diarrhea is still not completely understood, but some studies conducted for oncologic tyrosine kinase inhibitors could be helpful to understand the molecular mechanisms through which 31 diarrhea develops. Sometimes the addition of loperamide is indicated as a useful treatment to decrease intestinal motility. It is well known that the trial failed, showing an increase in the number of deaths and hospitalizations in the group treated with the triple therapy. Some of these mechanisms are obscure, some others are partially clear, and some of them are well understood and are being used to develop new therapeutic strategies. All of them are obviously inspired by the new pathogenic knowledge that comes every day from the research field. The drug was well tolerated, and just transient skin reactions were observed as adverse events. Cell-based therapies represent an innovative possibility to treat patients with lung fibrosis because transplanted cells could be potentially able to proliferate and differentiate into alveolar cells replacing the damaged epithelial alveolar cells and some benefits could be obtained from the paracrine properties of the newly administered cells. Stem cell properties have been investigated in murine models of lung fibrosis in different studies, showing that murine bone marrow­derived mesenchymal stem cells are able to target damaged pulmonary areas and to reduce inflammation and collagen deposition in the lung. Different routes of cell administration were tested, intravenously or through intraperitoneal or intratracheal 34 Interstitial Lung Disease For these reasons, during the last few years the scientific attention has focused on some steps of the fibrogenic process, characterized by the activation of multiple and different pathways that may represent specific therapeutic targets. The story of nintedanib, a drug born to be used in oncology for non­small cell lung cancer, is also interesting. The current approach to treatment is based on sequential therapy, so that one of the two approved drugs is started and when it is believed to be ineffective or side effects due to the drug are severe, it is possible to switch to the alternative drug. Similar to cancer, for the first time exists the possibility to have a first-line and, as alternative, a second-line of treatment. Two different clinical trials are currently under way exploring the safety of the association of pirfenidone and nintedanib, and hopefully, as in other diseases, there will be the possibility to use in the same patients a combination of drugs. The mechanisms of action of the two drugs seem different, so it is reasonable to think of a possible increase in their efficacy without necessarily having a sum of side effects. Other issues are unsolved such as the effective cell dose equivalent for cell therapy, defined as the minimum cell number required to have a significant result. Safety and tolerability are the most important issues because of the risk of teratoma and other risks associated with isolation, culture, and storage of cells. The most commonly used cells are mesenchymal cells, which are characterized by low immunogenicity and low risk of teratoma. The future development of cell therapy is fascinating and possibly realistic using bioengineering approaches that according to recent studies will make it possible to use decellularized whole lungs as a scaffold for subsequent cellular implantation. Genetic predisposition and aging play a fundamental role in altering the response of epithelial cells to chronic damage. The final result of all this is the activation of fibroblasts, and their recruitment, proliferation, and differentiation into myofibroblasts, resulting in scar formation and loss of lung function. Relationship of alveolar epithelial injury and repair to the induction of pulmonary fibrosis. Pirfenidone suppresses tumor necrosis factor-alpha, enhances interleukin-10 and protects mice from endotoxic shock. Effects of pirfenidone on transforming growth factor-beta gene expression at the transcriptional level in bleomycin hamster model of lung fibrosis. Collagen synthesis by normal and fibrotic human lung fibroblasts and the effect of transforming growth factor-beta. Pirfenidone for idiopathic pulmonary fibrosis: analysis of pooled data from three multinational phase 3 trials. Safety of pirfenidone in patients with idiopathic pulmonary fibrosis: integrated analysis of cumulative data from 5 clinical trials. Ameliorative effects of mosapride or Rikkunshi-to on the suppression of gastrointestinal motility by pirfenidone in rats. Effect of food and antiacids on the pharmacokinetics of pirfenidone in older healthy adults. Pirfenidone in idiopathic pulmonary fibrosis: expert panel discussion on the management of drug-related adverse events. Photosafety assessments on pirfenidone: photochemical, photobiological, and pharmacokinetic characterization. Pharmacokinetics, safety and tolerability of pirfenidone and its major metabolite after single and multiple oral doses in healthy Chinese subjects under fed conditions. Pharmacokinetic evaluation of tissue distribution of pirfenidone and its metabolites for idiopathic pulmonary fibrosis therapy. Antifibrotic effects of nintedanib in lung fibroblasts derived from patients with idiopathic pulmonary fibrosis. Anti fibrotic and antiinflammatory activity of the tyrosine kinase inhibitor nintedanib in experimental models of lung fibrosis. Reducing lung function decline in patients with idiopathic pulmonary fibrosis: potential of nintedanib. Phosphatidylinositol 3-kinase mediates the inhibitory effect of epidermal growth factor on calcium-dependent chloride secretion. Practical management of patients with chronic myeloid leukemia receiving imatinib. Intracellular glutathione and bronchoalveolar cells in fibrosing alveolitis: effects of N-acetylcysteine. Efficacy of inhaled N-acetylcysteine monotherapy in patients with early stage idiopathic pulmonary fibrosis. Effect of inhaled N-acetylcysteine monotherapy on lung function and redox balance in idiopathic pulmonary fibrosis. Expression of suppressor of cytokine signalling 1 in the peripheral blood of patient with idiopathic pulmonary fibrosis. The role of tyrosine kinases in the pathogenesis of idiopathic pulmonary fibrosis. Inhibition of plateletderived growth factor signalling attenuates pulmonary fibrosis. Effect of basic fibroblast growth factor on the proliferation, migration and phenotypic modulation of airway smooth muscle cells. Upregulation of acid fibroblast growth factor during development of experimental lung fibrosis. Basic fibroblast growth factor and its receptors in idiopathic pulmonary fibrosis and lymphangioleiomyomatosis. Significance of serum vascular endothelial growth factor level in patients with idiopathic pulmonary fibrosis. Anti-acid therapy and disease progression in idiopathic pulmonary fibrosis: an analysis of data from three randomized controlled trials. Protective effect of proton pump inhibitor for survival in patients with gastroesophageal reflux disease and idiopathic pulmonary fibrosis. Antiacid therapy and disease outcomes in idiopathic pulmonary fibrosis: a pooled analysis. Interleukin-13 induces tissue fibrosis by selectively stimulating and activating transforming growth factor beta(1). Recombinant human pentraxin-2 therapy in patients with idiopathic pulmonary fibrosis: safety, pharmacokinetics and exploratory efficacy. Mesenchymal stem cell engraftment in lung is enhanced in response to bleomycin exposure and ameliorates its fibrotic effects. Transplantation of allogeneic and xenogeneic placenta-derived cells reduces bleomycin-induced lung fibrosis. Epithelial cell differentiation of human mesenchymal stromal cells in decellularized lung scaffolds. Although relatively uncommon, these diseases are a significant health burden and frequently affect young adults in their most productive years. Cigarette smoke is a complex mixture of more than 4000 chemicals, many of which exert toxic effects on cellular function. This designation is supported by several lines of clinical, epidemiologic, and investigative evidence showing a direct role for cigarette smoking as witnessed in the temporal relationship to disease onset and progression, resolution on smoking cessation, and recurrence or progression on resumption of smoking. The fourth and final group consists of diseases that are less prevalent in smokers compared with For diseases allocated to Group 2 (Box 3. Cigarette smoking, particularly during the relatively early phase after initiation of smoking, seems to be an important precipitating factor in some but not in all cases of Group 2 diseases. On the contrary, insight gained from dissecting mechanisms by which smoking suppresses Th1 immunity-an essential driver of the immunopathogenic processes that characterizes these diffuse lung diseases-is also relevant to the pathogenesis of smoking-related lung cancer and airway diseases, diseases that are more prevalent in smokers partly because of impaired Th1 immunity. However, it is well recognized that a number of specific histopathologic entities can be induced by heterogeneous etiologies, potentially a reflection that the lung has only a limited number of ways of responding to various insults. Smoking cessation is imperative for all the diseases listed under Groups 1­3 in Box 3. It is our practice to use aggressive tobacco cessation strategies in these patients and have a low threshold for referral to nicotine dependence counselors. It is our practice to explicitly refer to diseases in Group 1 as "smokinginduced" to underscore the importance of smoking cessation and encourage removal of all tobacco products from the vicinity of the patient, including secondhand tobacco smoke exposure. Similarly, all current smokers with diseases in Groups 2 and 3 should be counseled regarding the emerging and compelling data implicating a direct pathogenic role for cigarette smoke exposure as a potential inducer or cofactor in disease induction and progression. The methods that should be considered in smoking cessation therapy include counseling and behavior therapy, nicotine replacement therapy, and pharmacotherapy, including the use of bupropion, varenicline, and clonidine in selected patients. Specific mechanisms by which exaggerated macrophage accumulation occurs in Group 1 diseases are not fully defined, but likely involve exaggerated generation of macrophage recruiting and differentiating factors by airway epithelial cells, enhanced macrophage survival locally, and/or diminished apoptosis of recruited macrophages. Smoking cessation may lead to improvement in radiologic abnormalities and lung function. Activated Langerhans cells and macrophages in peribronchiolar regions are likely to then promote secondary recruitment of T cells, plasma cells, and eosinophils, resulting in the formation of eosinophilic granulomatous inflammation from which the descriptive term "eosinophilic granuloma" is derived. Pulmonary function testing demonstrates variable results and may show obstructive, restrictive, mixed, or nonspecific abnormalities; pulmonary function testing may at times be completely normal. Exercise limitation correlates with markers of pulmonary vascular dysfunction, implying vascular involvement as an important cause of exercise limitation in these patients. Nodules with or without cavitation predominate in early disease, whereas cystic changes predominate in more advanced disease. Smoking cessation often leads to stabilization of symptoms and radiologic abnormalities. For patients with severe disease, systemic pharmacotherapy is often considered in addition to smoking cessation. Corticosteroid therapy in the form of oral prednisone 40­60 mg daily with slow tapering over months has historically been used to treat patients with severe or progressive disease, but the data on therapeutic benefit of corticosteroids are limited. The use of vasomodulators such as the endothelin antagonist bosentan and the phosphodiesterase inhibitor sildenafil should be considered in patients with moderate to severe pulmonary hypertension. It is possible, although not proven, that acute cigarette smoke exposure coupled with other proallergic exposures may facilitate the generation of cytokines. After initial presentation, the illness may progress rapidly over a 7- to 14-day period to diffuse pulmonary opacities and respiratory failure. Chest radiography typically shows bilateral alveolar opacities and small pleural effusions. In addition, corticosteroid therapy in varying doses has been used depending on the severity of respiratory manifestations. He had begun smoking cigarettes 3 weeks before this evaluation for progressive dyspnea. However, in multivariate analysis, this "protective effect" was lost, and both current and former smokers were observed to have a greater risk of death when compared with never-smokers. Interestingly, the presence of radiographic interstitial abnormalities correlated with less radiographic emphysema and a greater likelihood of spirometric restrictive impairment.

Suctioning and supplemental oxygen remain the cornerstone of treatment for bronchiolitis erectile dysfunction psychological causes treatment purchase viagra with dapoxetine 50/30mg online. Unlike asthma erectile dysfunction pills thailand purchase viagra with dapoxetine master card, the wheezing accompanying bronchiolitis is often less responsive to bronchodilators erectile dysfunction drug coupons viagra with dapoxetine 50/30mg buy low price. Nonetheless erectile dysfunction pills available in stores buy cheap viagra with dapoxetine 50/30mg on line, patients with significant hypoxia and hypercapnia may receive a trial treatment with aerosol bronchodilators to determine if this may improve symptoms best erectile dysfunction doctor order genuine viagra with dapoxetine, which may be continued if infants do show improvement. Infants with bronchiolitis do not respond to treatment with antiinflammatory agents, such as corticosteroids, so these are not recommended. Severely ill patients may require mechanical ventilation; heated, humidified, high-flow nasal cannula oxygen has been shown to decrease intubation rates and can be used in children with severe respiratory distress. Treatment with exogenous surfactant or helium-oxygen mixtures for severely ill infants requiring intubation and mechanical ventilation has yielded mixed results and remains experimental. Recommended Step for Initiating Therapy Step 1 Step 2 Step 3 and consider short course of oral systemic corticosteroids In 2­6 weeks, depending on severity, evaluate level of asthma control that is achieved. If no clear benefit is observed in 4­6 weeks, consider adjusting therapy or alternative diagnoses. For treatment purposes, patients who had 2 exacerbations requiring oral systemic corticosteroids in the past 6 months, or 4 wheezing episodes in the past year, and who have risk factors for persistent asthma may be considered the same as patients who have persistent asthma, even in the absence of impairment levels consistent with persistent asthma. Mycoplasma pneumoniae Infections One of the basic tenets regarding respiratory infections in children is that "bacteria do not make you wheeze. Atypical pneumonia (diffuse infiltrates with nonlobar pattern; fever, malaise, myalgias) is often caused by M. Vocal Cord Dysfunction A functional disorder that mimics asthma, vocal cord dysfunction is typically manifested as wheezing, dyspnea, and shortness of breath refractory to treatment with inhaled bronchodilators. Vocal cord dysfunction should be considered in patients with wheezing who present with atypical findings or those who are difficult to treat. The wheezing is produced by adduction of the vocal cords during inspiration and expiration. The resultant high-pitched inspiratory and expiratory noises are transmitted to the chest, although the sounds are best appreciated over the larynx. The diagnosis is established by direct laryngoscopy, which demonstrates paradoxical motion of the vocal cords. For treatment purposes, patients who had 2 exacerbations requiring oral systemic corticosteroids in the past year may be considered the same as patients who have persistent asthma, even in the absence of impairment levels consistent with persistent asthma. If both main stem bronchi or the trachea are obstructed (typically by larger foreign bodies), the patient may have asphyxia and sudden death; aspiration of foreign bodies in the distal airways often takes a more indolent course. Aspiration of foreign bodies is most common in children between 1 and 4 years of age, particularly in boys or in children with neurologic disorders or delayed development. The most common objects aspirated by children are small toy parts, coins, marbles, balloons, and food products. Endobronchial aspiration of peanuts, raisins, popcorn kernels, or seeds tends to produce more difficulties than other kinds of foreign bodies (metallic or plastic objects) because, in addition to causing physical obstruction of the airway, vegetable matter produces an intense, local inflammatory response secondary to chemical and allergic bronchitis. Esophageal foreign bodies can produce significant respiratory symptoms as a result of extrinsic compression of the posterior trachea. This compression can produce respiratory distress, stridor, and wheezing, especially in infants and young children. Dysphagia and vomiting can be late symptoms associated with an esophageal foreign body. The typical clinical manifestation after the acute event is abrupt respiratory distress, characterized by choking, gagging, cyanosis, and a harsh, paroxysmal cough (see Chapter 2). However, because many aspiration events occur while children are unsupervised, the history of foreign body ingestion or aspiration is frequently not elicited. Because the object is most frequently aspirated into the main stem or segmental bronchi (distal airway), the wheezing is typically unilateral. Physical examination may also reveal a decrease in breath sounds on the obstructed side, prolongation of the expiratory phase, and a tracheal shift. In some instances, retained foreign bodies in the airways can produce a persistent pneumonitis, and the chronic inflammatory response can result in bronchiectasis or lung abscess. Retained foreign body should be considered in a child with presumed asthma or pneumonia who is not improving with appropriate treatment. Recommended Step for Initiating Treatment Step 1 Step 2 Step 3 Step 4 or 5 and consider short course of oral systemic corticosteroids In 2­6 weeks, evaluate level of asthma control that is achieved, and adjust therapy accordingly. Radiopaque foreign bodies are generally easily visualized by radiographic studies. Radiolucent foreign bodies may become apparent on inspiratory or expiratory chest radiographs, lateral decubitus films, fluoroscopy, or barium swallow studies when an esophageal foreign body could be compressing the posterior tracheal wall. Because an occasional foreign body may not lodge in a bronchus, typical radiologic findings may not be seen. If a foreign body is likely to be present, rigid bronchoscopy for examination of the lower airway and foreign body removal is indicated. Flexible bronchoscopy provides an excellent visualization of the airway and should be reserved for when other diagnoses appear to be much more likely. Epiglottitis is the most serious life-threatening infection in this area and must be identified quickly. A history of prior intubation in a patient with stridor and respiratory distress should raise concern for vocal cord paralysis or subglottic stenosis. Croup Laryngotracheal bronchitis (croup) is generally a slowly progressive, mild, self-limited viral inflammation of the subglottic larynx occurring in infants and young children. The most common causes are parainfluenza virus types 1 and 3, influenza A, respiratory syncytial virus, and adenovirus. The inflammation associated with a viral infection in this location causes airway obstruction as edema develops within the confines of the cricoid cartilage. Most patients will develop mild rhinorrhea, cough, and low-grade fever prior to characteristic barky cough and inspiratory stridor (see Chapter 2). Stridor typically worsens when the patient is upset or active, and improves with warm humidified air. Unless the airway obstruction is severe, the child generally has Stridor Stridor, a harsh medium-pitched sound typically heard on inspiration, is caused by turbulent airflow in the upper airway. The most common cause of stridor of infants and young children is laryngomalacia, Congenital anomalies should be suspected in children with recurrent or persistent stridor. If a patient develops drooling or rapid progression of respiratory distress, epiglottitis or bacterial tracheitis should be considered. Management varies from outpatient observation with parent education to endotracheal intubation. For mild cases, the patient must be well hydrated; the use of extra humidity is soothing to the airways and helps to keep secretions from being tenacious, so that they are less likely to become obstructive. In more severe cases (stridor at rest, retractions), nebulized epinephrine used as a mucosal vasoconstrictor may provide relief. Usually, patients being treated in this manner are observed in the hospital for a possible "rebound" effect that may occur 2-6 hours after treatment. Parenteral or oral dexamethasone is a safe and effective additional therapy for moderate to severe croup; steroid use has decreased the requirement for endotracheal intubation. If intubation is needed, an endotracheal tube one-half to one size smaller than that used for a child with a normal airway of the same age and size is chosen. In atypical cases of recurrent croup or in patients in whom extubation is difficult, an endoscopic evaluation of the airway with laryngoscopy and bronchoscopy is necessary to exclude an underlying anatomic abnormality. Bacterial Tracheitis Bacterial tracheitis is a bacterial superinfection of a previous tracheal (croup, influenza virus) viral process and is usually caused by Staphylococcus aureus. Relative comparative anatomy of the larynx in an infant (left) and an adult (right). Specific landmarks: 1, epiglottis; 2, arytenoid cartilages; 3, thyroid cartilage; 4, cricoid cartilage; 5, laryngeal ventricle, the air space below the false vocal cords and above the true vocal cords. These anatomic differences partially explain the predominantly obligate nose breathing of the young infant, as well as the relative ease with which upper airway obstructions develop in infants. A, Frontal radiograph of the neck shows a tapered reduction of the subglottic tracheal caliber from the level of the vocal cords (upper arrow) to the normal-caliber trachea below (lower arrow). The right mild tracheal deviation is a normal sign resulting from the left aortic arch. B, Lateral view shows a normal epiglottis (upper arrow), distention of the pharynx, normal palatine tonsils (arrowhead), and increased density in the subglottic trachea (lower arrow). There is generally a virus-like mild phase, followed by a rapid deterioration, during which the patient clinically appears more ill with high fever and respiratory distress. Some patients have a two-phased illness with croup, initial recovery, followed by tracheitis. Close monitoring and intravenous antibiotic treatment directed toward the likely causative organisms are required. Endotracheal intubation for control of the airway is usually necessary, particularly in younger patients. Extubation is performed on the basis of clinical improvement and a resolution of excessive amounts of purulent secretions. Sometimes the exudate secondary to the tracheitis is thick and can cause airway obstruction similar to that from a foreign body. Epiglottitis Epiglottitis is an acute, rapidly progressive, potentially lethal infection of the epiglottis, aryepiglottic folds, and false vocal cord area. It is an emergency because of the potential for rapid airway obstruction; evaluation and treatment are directed toward establishing an airway while the physician is confirming the diagnosis and treating the infection. In the past, epiglottitis was caused by Haemophilus influenzae type b in nearly 100% of cases. However, in an internationally mobile world, patients who have not been vaccinated may acquire epiglottitis in any country. Unusual presentations will also become more common, with children presenting at a younger age and immunosuppressive diseases being caused by atypical organisms. Typically, there is an abrupt onset, usually without an obvious prodrome, with rapid progression toward airway compromise. There is a "hot potato" 54 Section 1 RespiratoryDisorders experienced pediatric anesthesiology and otolaryngology personnel capable of endotracheal intubation or less often tracheostomy. Once the airway is secured and the diagnosis confirmed, blood specimens are obtained for culture and treatment is begun with ceftriaxone or cefotaxime. Patients usually require 36-48 hours of endotracheal intubation, with observation in the pediatric intensive care unit. If there is a question of safety of extubation, a second laryngoscopy is indicated. Laryngomalacia Laryngomalacia is the most common cause of inspiratory stridor and noisy respiration in neonates and infants. It is caused by the inspiratory collapse of the laryngeal cartilages, with prolapse of the epiglottis or arytenoid cartilages into the airway during inspiration. Stridor may occur at birth, but the onset is often delayed, occurring at 2-4 weeks of age. The condition is usually self-limited and resolves with time: often by 8-12 months of age but occasionally not until 18-24 months of age. Laryngomalacia should be suspected in infants with recurrent croup, as acute viral infections or agitation can worsen symptoms. Patients often will have associated gastroesophageal reflux disease, and some may have feeding difficulties or failure to thrive. The diagnosis is made on the basis of the clinical presentation (stridor is worse when the patient is supine or during activity, and exacerbations occur with upper respiratory tract infections) and findings on flexible laryngoscopy. Approximately 15-25% of patients with laryngomalacia may have other airway lesions. Therefore a complete airway evaluation with rigid bronchoscopy has been recommended in patients with severe respiratory distress, failure to thrive, any underlying concern for a concurrent airway lesion, and if the stridor of laryngomalacia does not follow the typical course. Unusually severe cases of laryngomalacia may necessitate operative intervention, such as a supraglottoplasty to trim redundant soft tissue or even a temporary tracheotomy. Laryngomalacia may be accompanied by tracheomalacia, a partial collapse of the tracheal cartilages with respiration. Tracheomalacia may be congenital or secondary to extrinsic compression by vascular rings or tumors. Patients with tracheomalacia manifest with wheezing, cough, stridor, dyspnea, tachypnea, or cyanosis. Vocal Cord Paralysis Vocal cord paralysis is a common cause of congenital neonatal laryngeal obstruction, but can also occur in older children. Vocal cord paralysis may be bilateral or unilateral, and it often can cause difficulty feeding, respiratory distress, and a weak cry. In neonates with no surgical history, it is associated with neurologic syndromes, such as the Arnold-Chiari malformation. Traction on the brainstem or increased intracranial pressure and herniation puts pressure on the vagus nerve, which is thought to cause the paralysis. It can also be iatrogenic, particularly in neonates with a history of thoracic surgery or difficult delivery. Vocal cord paralysis also occurs in older children and may be caused by a polyneuropathy (Guillain-Barré syndrome), brainstem encephalitis, neck or thoracic surgery, or compression by local masses. Lateral radiograph shows an enlarged epiglottis ("thumb-print" sign) and aryepiglottic folds (arrow) and distention of the pharynx. Mild inspiratory stridor and retractions may be present, but these are usually not obvious, because the patient generally takes short, shallow breaths. An intraoral examination is contraindicated because it may predispose to laryngospasm and airway obstruction. Someone who has the expertise and equipment to handle sudden airway decompensation in a pediatric patient should accompany the patient to the radiology suite.

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Activation is thought to be analogous to the alternative pathway activation of C3 by certain bacterial products and polysaccharides erectile dysfunction doctor in mumbai buy viagra with dapoxetine 50/30 mg mastercard. These antibodies are induced in vivo against the basement membrane of the glomerulus and possibly that of the renal tubule or lung erectile dysfunction protocol list 50/30 mg viagra with dapoxetine mastercard. The end result may be direct damage to the bone marrow erectile dysfunction herbs a natural treatment for ed viagra with dapoxetine 50/30mg buy visa, with or without complement activation erectile dysfunction doctors in arizona buy 100/60mg viagra with dapoxetine amex. Production of anti­bone marrow antibodies erectile dysfunction treatment spray viagra with dapoxetine 100/60 mg lowest price, however, appears to be self-limited and lasts for several weeks to months after removal of the inciting agent. Tubulointerstitial Nephritis Tubulointerstitial nephritis involving the renal tubules has been associated with a variety of causes, including immune complex­ mediated disease. Precipitating factors can include drugs and possibly infection, as well as the involvement of transplanted kidneys. Skeletal Muscle Diseases Inflammatory Myopathy Polymyositis and dermatomyositis are the most common expressions of a group of chronic inflammatory diseases and can be subclassified into the following six categories: · Primary idiopathic polymyositis · Primary idiopathic dermatomyositis · Polymyositis or dermatomyositis associated with neoplasia · Childhood polymyositis or dermatomyositis · Dermatomyositis or polymyositis associated with collagen vascular disease · Polymyositis or dermatomyositis associated with infections All these diseases have skeletal muscle damage by a lymphocyte inflammatory process resulting in symmetric weakness, predominantly of proximal muscles. Polymyositis may be accompanied by inflammation at other sites, especially in the joints, lungs, and heart. The term dermatomyositis is used for the disease when the clinical features of disease are accompanied by characteristic inflammatory manifestations in the skin. The causes of these diseases remain unknown, but they may develop in genetically susceptible persons after exposure to environmental agents that induce immune activation and inflammation. As part of the inflammatory response to the infection, susceptible individuals develop a persistent cell-mediated immune attack that continues to destroy muscle after the acute infection is eradicated. Polymyositis and dermatomyositis are more common in females, with peaks of occurrence in childhood and the fifth decade. Clinically, these diseases present with proximal muscle weakness, sometimes associated with pain, fatigue, and lowgrade fever, and lead to atrophy in progressive disease. Evidence has suggested the polymyositis and dermatomyositis result from immune destruction. Muscle biopsies in patients with dermatomyositis have shown vasculitis, with IgG and complement deposition in the vessel walls in children and infrequently in adults. An increased frequency of activated T cells has been noted in polymyositis and dermatomyositis. Skin Diseases: Bullous Disease and Other Conditions Two immunologic assays that can be used in conjunction with other clinical information include measurement of antibodies to the basement membrane area of the skin and of antibodies to the intercellular substance of the skin. Antiskin (dermal-epidermal) antibodies are present in more than 80% of patients with bullous pemphigoid, but the absence of antibodies does not rule out the disease. Antiskin (interepithelial) antibodies can be detected in 90% of patients with pemphigus. A rising antibody titer may indicate an impending relapse of pemphigus, and a decreasing titer suggests effective control of the disease. A wide variety of autoimmune diseases are associated with skin manifestations (Box 27. Which chemical and immunologic assays would be helpful in establishing a diagnosis for this patient What is the prevalence of anti­intrinsic factor in patients with pernicious anemia What is the prevalence of parietal cell antibodies in patients with pernicious anemia She reported being in excellent health until a month ago, when she began to notice weakness and numbness in her right hand and leg. Physical examination revealed an overweight young female with a right facial droop. In addition, she staggered on turning around and had difficulty walking in a straight line. Histologically, a biopsy of white matter demonstrated sheets of macrophages, clumps of lymphocytes and plasma cells, and myelin debris. In the diagnosis of multiple sclerosis, the most significant body fluid to analyze is: a. Biopsy of the brain See Appendix A for the answer to the multiple choice question. Procedure Notes Sources of Error Failure to observe the test mixture at the appropriate time can yield false results. A specific diagnosis depends on the evaluation of test results and clinical manifestations. Midspectrum diseases are characterized by localized lesions in a single organ and organ-nonspecific autoantibodies. Many diagnostic laboratory tests are based on detecting these autoimmune responses. All of the following characteristics are common to organ-specific and organ-nonspecific diseases except: a. Antibody expression in the development of autoimmunity is regulated by all of the following factors except: a. A characteristic associated with acetylcholine receptor-blocking antibodies is: a. A characteristic associated with anti­glomerular basement membrane antibodies is: a. Found in one third of patients with uncomplicated polymyositis and some patients with dermatomyositis 14. Elimination of the small clone of immunocompetent cells programmed to react with the antigen c. Induction of unresponsiveness in the immunocompetent cells through excessive antigen binding d. Strongly suggestive, in a high titer, of primary biliary binding antibody cirrhosis b. The immunologic manifestations of multiple sclerosis include all of the following except: a. Most immunologically mediated renal diseases fall into one of the following categories, except for: a. The immunologic abnormality associated with autoimmune pancreatitis in the Japanese population is: a. Bach J: the effect of infections on susceptibility to autoimmune and allergic diseases, N Engl J Med 347(12):911­919, 2002. Black A: Antiphospholipid syndrome: an overview, Clin Lab Sci 19(3):144­147, 2006. Gosink J: Laboratory diagnostics for celiac disease, Med Lab Observer 44(3):30­33, 2012. Kuhle J, Pohl C, Mehling M: Lack of association between antimyelin antibodies and progression to multiple sclerosis, N Engl J Med 356(4):371­378, 2007. Lechner K, Jager U: How I treat autoimmune hemolytic anemias in adults, Blood 116(11):1831­1838, 2010. Mooney B: Diagnosing pediatric autoimmune diseases, Adv Med Lab Prof 4(1):13­14, 2002. Nimmo M: Celiac disease: an update with emphasis on diagnostic considerations, Lab Med 36(6), 2005. Watanabe T, Tsuchida T, Kanda N: Anti­alpha-Fodrin antibodies in Sjögren syndrome and lupus erythematosus, Arch Dermatol 135(5):535­539, 1999. Malar rash Discoid rash Photosensitivity Oral ulcers Nonerosive arthritis Pleuritis or pericarditis 429 1997 Update of the 1982 American College of Rheumatology Revised Criteria for Classification of Systemic Lupus Erythematosus Definition Fixed erythema, flat or raised, over the malar eminences, tending to spare the nasolabial folds Erythematous raised patches with adherent keratotic scaling and follicular plugging; atrophic scarring may occur in older lesions Skin rash as a result of unusual reaction to sunlight by patient history or physician observation Oral or nasopharyngeal ulceration, usually painless, observed by physician Involving two or more peripheral joints, characterized by tenderness, swelling, or effusion 1. A false-positive test result for at least 6 mo and confirmed by Treponema pallidum immobilization or fluorescent treponemal antibody absorption test Standard methods should be used in testing for the presence of antiphospholipids An abnormal titer of antinuclear antibody by immunofluorescence or an equivalent assay at any point in time and in the absence of drugs known to be associated with drug-induced lupus syndrome 7. It is a multisystem autoimmune disorder that can affect the skin, joints, and almost any organ or body system, including the lungs, kidneys, heart, and brain. Systemic lupus may include periods in which few, if any, symptoms are evident (remission) and other times when the disease becomes more active (flare). Most often, when people mention "lupus," they are referring to the systemic form of the disease. Both genetic and environmental factors have been implicated in the disease mechanism. In the past decade, a growing body of evidence has indicated an important role of gut microbes in the development of autoimmune diseases. Environmental factors, hormones, antibiotics, and diet can have an impact on lupus. Drug-Induced Lupus Drug-induced lupus occurs after the use of certain prescribed drugs (Box 28. The most frequently used drugs associated with drug-induced lupus are hydralazine hydrochloride and procainamide hydrochloride. High antibody titers may exist for months without the development of clinical symptoms. Even with discontinuation of the drug, antibody titers usually remain elevated for months or years. Only about 4% of patients who take these drugs will develop the antibodies suggestive of lupus. Of those 4%, only an extremely small number will develop overt drug-induced lupus. The symptoms of drug-induced lupus are similar to those of systemic lupus, but milder. Patients with drug-related lupus have a predominance of pulmonary and polyserositic signs and symptoms. Genetic Predisposition Lupus is known to occur within families, but there is no identified gene or genes associated with lupus. Previously, genes on chromosome 6 called immune response genes were associated with the disease. The discovery of a gene on chromosome 1 has been associated with lupus in certain families. Only 10% of lupus patients will have a parent or sibling who already has or may develop lupus. Statistics show that only about 5% of the children born to those with lupus will develop the illness. There is speculation that the lower exposure to infectious organisms leads to the rise of allergies and some autoimmune diseases. Neonatal lupus is associated with a rash that appears within the first several weeks of life and may persist for about 6 months before disappearing. However, a primary defect in the regulation of the immune system is considered important in the pathogenesis of the disorder. Therefore improvement in hygiene and the absence or reduction of certain microbes may contribute to the higher incidence and faster progression of lupus disease. These conditions do resolve themselves in the newborn after the antibody titer declines (see earlier discussion of neonatal lupus). Antibiotics Antibiotics, which can remove gut bacteria, are known to trigger lupus flares. These include sulfa drugs such as trimethoprim­sulfamethoxazole, tetracycline-related antibiotics, and penicillin-related antibiotics. Antibiotics can cause diarrhea and remove beneficial microbes from the intestinal tract. Metabolites produced by gut bacteria, especially butyrate produced by Clostridia, can promote the differentiation of regulatory T cells (Tregs) in the colon, spleen, and lymph nodes to suppress inflammation. African Americans have used antibiotics much more frequently than people in West African countries, which may have an impact on the differences in lupus prevalence and severity between the two populations. Inhibition of neutrophil extracellular traps prevents endothelial damage that promotes the progression of lupus disease. Hormonal Influences Hormonal factors may explain why lupus occurs more frequently in women than in men. The increase in disease symptoms may be caused by hormones, particularly estrogen. There is a risk that the disease will worsen during pregnancy and the immediate postpartum period. The exact reason for the greater prevalence of lupus in women, and the cyclic increase in symptoms, is unknown. A condition called the antiphospholipid syndrome can be secondary to lupus and may complicate pregnancy. Antibodies against specific autoantigens often present on coagulation factors can cause blood to clot faster than normal or, in some cases, not at all. Antiphospholipid antibodies can be found in many patients with lupus and pose a particular risk to pregnant lupus patients because their presence is often associated with miscarriages. Both the developing fetus and the pregnant mother with lupus are at increased risk of various complications during and after pregnancy. The prevalence ranges from 20 to 200 cases per 100,000 persons, with higher prevalence for people of African, Hispanic, or Asian (particularly Chinese) ancestry. Although the disease affects both males and females, women of childbearing age are diagnosed nine times more often than men. The two most frequent causes of death are renal failure and infectious complications. It usually follows a chronic and irregular course, with periods of exacerbations and remissions. Clinical signs and symptoms can include fever, weight loss, malaise, arthralgia (joint pain) and arthritis (inflammation of the joints), and the characteristic erythematous, maculopapular ("butterfly") rash over the bridge of the nose (Table 28. In addition, there is a tendency toward increased susceptibility to common and opportunistic infections. The onset of lupus can be caused by sun exposure, resulting in sudden development of a rash and then possibly other symptoms.

A mutation of tp53 is associated with an increased incidence of many types of cancer erectile dysfunction treatment in tampa 100/60 mg viagra with dapoxetine purchase with visa. Specific molecular pathways that activate tp53 depend on the nature of the stress and the cell type erectile dysfunction treatment penile injections purchase viagra with dapoxetine 50/30 mg line. Consequently erectile dysfunction pills walmart buy cheap viagra with dapoxetine 100/60mg on line, these determine the specific downstream effectors and cellular response-apoptosis erectile dysfunction treatment bayer buy generic viagra with dapoxetine on line, growth arrest erectile dysfunction vacuum pumps australia order viagra with dapoxetine on line, or senescence. Cells that have sustained mutations in oncogenes or tumor suppressor genes because of the damage obtain a growth advantage that fuels the development of cancer. For any given cancer type, tp53 dysfunction generally correlates with poor treatment response and poor prognosis; therefore restoration of tp53 function is a potential avenue for therapeutic development. About 25% of patients with acute myelogenous leukemia display this point mutation. Over a lifetime, a variety of mutations can convert a normal gene into a malignant oncogene. Once an oncogene is activated by mutation, it promotes excessive or inappropriate cell proliferation. Oncogenes have been detected in about 15% to 20% of a variety of human tumors and appear to be responsible for specifying many of the malignant traits of these cells. More than 30 distinct oncogenes, some of which are associated with specific tumor types, have been identified (Table 31. Each gene has the ability to evoke many of the phenotypes characteristic of cancer cells. Major classes of oncogene products involved in the normal growth process of cells include the following: · Growth factors. Viruses carry viral oncogenes into target cells, where they become firmly established. These tumor-suppressing genes in normal cells appear to regulate the proliferation of cell growth. When this type of gene is inactivated, a block to proliferation is removed and cells begin a program of deregulated growth, or the genetically depleted cell itself may proliferate uncontrollably. In time, their discovery will lead to the reformulation of ideas about how the growth of normal cells is regulated. Much speculation surrounds the operation of tumor-suppressing genes in normal tissue. It is known that normal cells exert a negative growth influence on each other within a tissue. Normal cells also secrete factors that are negative regulators of their own growth and that of adjacent cells. It is speculated that normal cells must have receptors that detect the presence of these growth-inhibiting and differentiation-inducing factors, which allow them to process the signals of negative growth and respond with appropriate modulation of growth. Genes may specify proteins necessary to detect and respond to the negative regulators of growth. If this process becomes dysfunctional as a result of inactivation or the absence of a critical component, such as the loss of chromosomal loci, a cell may continue to respond to mitogenic stimulation but lose its ability to respond to negative feedback to cease proliferation. Animal experiments have suggested that human beings carry a repertoire of genes, each of which is involved in the negative regulation of the growth of specific cell types. Somatic inactivation of these genes may be involved in the initiation of tumor cell growth or the transformation of benign tumors into malignant ones. Therefore the somatic inactivation of tumor-suppressing genes may be as important to carcinogenesis as the somatic activation of oncogenes. Tumors express antigens that are recognized as foreign by the immune system of the tumor-bearing host. The immune system can be stimulated to kill tumor cells and rid the host of the tumor. In contrast, there is a long-lasting debate on whether cancer prevention is a primary function of the immune system. The concept of immunologic surveillance of cancer was developed more than 50 years ago. Although there is no single satisfactory explanation for the success of tumors in escaping the immune rejection process, it is believed that early clones of neoplastic cells are eliminated by the immune response. The growth of malignant tumors is primarily determined by the proliferative capacity of the tumor cells and by the ability of these cells to invade host tissues and metastasize to distant sites. Virus-induced cancers are the most antigenic; chemical-induced cancers are the least antigenic. Tumor markers are substances present in or produced by malignant tumors or by other cells of the body in response to cancer or certain benign conditions. But when malignant cells are present, the concentration of the tumor marker exists in a much higher concentration. Some tumor markers are associated with only one type of cancer, but other markers are associated with two or more types of cancer. Most tumor markers are proteins and can be detected in blood, body fluids, cells, or tissue (Table 31. Tumor markers can be measured quantitatively in tissues and body fluids using biochemical, immunochemical, or molecular tests. Antibodies Antibodies are probably less important than T lymphocytes in mediating the effect of antitumor immune responses, but tumor-bearing hosts produce antibodies against various tumor antigens. Although malignant tumors may express protein antigens that are recognized as foreign by the tumor host, and despite the fact that immunosurveillance may limit the outgrowth of some tumors, the immune system often does not prevent the occurrence of cancer. Under some conditions, noncancerous (benign) conditions can cause the levels of certain tumor markers to increase. In addition, not every patient with a particular type of cancer will have a higher level of a tumor marker associated with that cancer. The earliest identified tumor marker was Bence Jones protein, a light-chain immunoglobulin, found in patients with multiple myeloma (see Chapter 26). Over the last 15 years, the use of tumor markers in the United States has risen dramatically. Tumor markers play an especially important role in the diagnosis and monitoring of patients with prostate, breast, and bladder cancers. An ideal tumor marker would be an assay in which a positive result would only occur in patients with a malignancy, would correlate with stage and response to treatment, and is easily reproducible. No tumor marker to date has met this ideal marker description, nor has any tumor marker been established as a practical screening test in a general healthy population or in most high-risk populations. The rationale for this poor predictive value of tumor markers is the lack of sensitivity and specificity in the low cancer rates that prevail in population groups. Because of the low prevalence of cancer, in general, even assays that are highly sensitive and specific may have a low predictive value. Older, well-established markers include alkaline phosphatase and collagen-type markers in bone cancer, immunoglobulins in myeloma, catecholamines and their derivatives in neuroblastoma and pheochromocytoma, and serotonin metabolites in carcinoid. Other recently approved protein biomarkers can be detected in urine, such as nuclear matrix protein 22, fibrin and fibrinogen degradation products, and bladder tumor antigen for monitoring bladder cancer, and by immunohistochemical methods using tumor tissues, such as estrogen receptor for breast cancer. Multiple-marker combinations are useful in the management of some cancers (Table 31. Protein derived from genes mutated in tumor cells and/or genes transcribed at different levels in tumor compared with normal cells. Eventually, one variant may escape the killing mechanism or recruit regulatory cells to protect it and be able to spread unchallenged. Spontaneous tumor antigens 505 those produced experimentally by chemical, viral, or physical agents. Although substantial evidence supports the contention that these tumors do not produce unique antigens, some evidence has refuted this contention. These antigens are not expressed on the virion but are synthesized by the host cell. Therefore each specific virus induces the same antigens, regardless of the tissue of origin or the animal species. Carcinofetal Antigens Well-differentiated tissue produces and secretes little or no fetal gene products. The abnormal behavior of malignant cells is believed to derepress genes normally expressed only during fetal life. Because the products of these fetally active genes are recognized as self, they do not elicit humoral or cell-mediated responses. During malignant transformation, however, gene derepression is responsible for the production of increased concentrations of these gene products, which are known as oncofetal proteins. Spontaneous Tumor Antigens Tumors caused by no known mechanism, known as spontaneous tumor antigens, are thought to produce antigens. Levels should be obtained every 2 to 4 weeks (metabolic half-life in vivo, 4 days). It is recommended for monitoring patients for recurring epithelial ovarian cancer. Therefore it is not suitable for use in the screening or diagnosis of ovarian cancer. Thyroglobulin Thyroglobulin (Tg) is produced and used exclusively by the thyroid gland. A Tg assay is frequently ordered before thyroid surgery to determine whether the tumor is producing Tg. This assay can be performed to monitor cancer recurrence because of rising levels over time after thyroid surgery. Prostate-Specific Antigen and Prostatic Acid Phosphatase Prostate cancer is a leading cause of cancer death in U. Because of this many false-positive results were reported and many unnecessary prostate biopsies were performed. It is a protease enzyme secreted almost exclusively by prostatic epithelial cells. A persistent elevation is indicative of residual disease or poor therapeutic response. Elevated levels have been found in patients with pancreatic, hepatobiliary, colorectal, gastric, hepatocellular, pancreatic, and breast cancers. The sensitivity is much better in higher stage disease, which makes it a good measure of tumor burden. Changes in tumor burden are reflected by changes in the tumor marker concentration. This biomarker lacks sensitivity and specificity and is approved only for monitoring patient response to treatment and recurrence. This tumor marker may be useful in conjunction with other clinical methods for predicting early recurrence of breast cancer. Its level has been shown to correlate to tumor mass in solid tumors, so it can be used to monitor progression of these tumors. Neuron-specific enolase is an isoenzyme specific for all tumor cells derived from the neural crest. An enzyme increase has been detected in neuroblastoma, pheochromocytoma, oat cell carcinomas, medullary thyroid and C-cell parathyroid carcinomas, and other neural crest­derived cancers. Miscellaneous Hormone Markers Elevated or inappropriate serum levels of hormones can function as tumor markers. In addition, some breast cancers demonstrate progesterone and estradiol (estrogen) receptors, which are strongly correlated with a positive response to antihormone therapy. Patients with neuroblastoma and pheochromocytoma secrete catecholamine metabolites that can be detected in the urine. Neuroblastomas also release neuron-specific enolase and ferritin; these markers can be used for diagnosis and prognosis. Breast, Ovarian, and Cervical Cancer Markers For more than 15 years, circulating breast cancer antigens have been used to monitor therapy and evaluate recurrence of the cancer. Estrogen and progesterone receptors are universally accepted as prognostic markers and therapeutic choice indicators. A newer and more powerful predictor of the outcome of primary breast cancer in young women has been reported. Microarray analysis of a previously established 70-gene profile has demonstrated that a good-prognosis gene expression signature is a strongly independent factor in predicting disease outcome. Bladder Cancer Tumor markers for the management of patients with bladder cancer have been actively investigated. Telomerase was first observed in ovarian cancer cells, and its presence was later established in almost all cancers. For example, telomerase inhibition could adversely affect stem cells, which help produce blood cells and lymphocytes and may need the enzyme to function. Second, telomerase inhibition has not been proved or tested physiologically in human beings. Finally, a drug based on telomerase would have to reduce the ability of the cancer to spread. Screening for telomerase inhibitors and plans for future studies to discover and develop chemicals that block the action of telomerase may suggest a design of more effective anticancer drugs. A portion of both receptors is released from the cell surface and circulates in normal people and in abnormally high levels in cancer patients. The shed portions can be measured in serum or plasma using antibody-based immunoassays. Microarrays have the potential to uncover signature gene expression patterns for specific cancers and ultimately assist in the staging of tumors, prognosis, and treatment. Expansion of computer-assisted bioinformatics has simplified the process of protein identification from mass spectra. Oncogene mutations that characterize colorectal neoplasia are detectable in exfoliated epithelial cells in the stool. One small panel of 5 to 50 genes can be used for each tumor type and assayed at once, currently within about 3 days. Improved management of cancer treatment for genotyping patient-specific tumors and mutations as well as guiding treatment options.

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