Loading

Your search results

Extra Super Levitra

Treatment of allergic rhinitis with a new long-acting H 1 receptor antagonist: astemizole buy generic extra super levitra 100mg on-line. Comparative outdoor study of the efficacy buy discount extra super levitra 100 mg online, onset and duration of action and safety of cetirizine, loratadine and placebo for seasonal allergic rhinitis. Efficacy of continuous treatment with astemizole (Hismanal) and terfenadine (Seldane) in ragweed pollen-induced rhinoconjunctivitis. A double-blind study of astemizole and terfenadine in the treatment of perennial rhinitis. Safety and efficacy of loratadine (Sch-29851): a new non-sedating antihistamine in seasonal allergic rhinitis. Evaluation of the efficacy and safety of loratadine in perennial allergic rhinitis. French multicentre double-blind study to evaluate the efficacy and safety of acrivastine as compared with terfenadine in seasonal allergic rhinitis. Double blind comparisons of cetirizine and placebo in treatment of seasonal rhinitis. Double-blind placebo-controlled study of loratadine mequitazine, and placebo in the symptomatic treatment of seasonal allergic rhinitis. Comparison of the efficacy and safety of loratadine, terfenadine and placebo in the treatment of seasonal allergic rhinitis. Effect of levocabastine, a new H1 antagonist, in a conjunctival provocation test with allergens. Pharmacokinetics and antipruritic effects of hydroxyzine in children with atopic dermatitis. Primary acquired cold urticaria: double blind study of treatment with cryproheptadine, chlorpheniramine and placebo. Efficacy and safety of astemizole, a long-acting and nonsedating H1 antagonist for the treatment of chronic idiopathic urticaria. The treatment of mild to severe chronic idiopathic urticaria with astemizole: double-blind and open trials. The effect of single and multiple dose therapy with azelastine on the immediate asthmatic response to allergen provocation testing. The in vivo potency and selectivity of azelastine as an H 1 histamine-receptor antagonist in human airways and skin. Lack of efficacy of a decongestant-antihistamine combination of otitis media with effusion in children. Efficacy of amoxicillin with and without decongestant antihistamine for otitis media with effusion in children. Intranasally and orally administered antihistamine treatment of experimental rhinovirus colds. Parameter documents of the Joint Task Force on Practice Parameters in Allergy, Asthma and Immunology 1998;81:501. The pharmacokinetics and pharmacodynamics of hydroxyzine in patients with primary biliary cirrhosis. Stimulatory effect of chronic drug administration on drug and metabolizing enzymes in liver microsomes. The effect of chronic administration of hydroxyzine on hydroxyzine pharmacokinetics in dogs. Effects of topical treatment H 1 and H2 antagonists on clinical symptoms and nasal vascular reactions in patients with allergic rhinitis. Suppression of gastric H2-receptor mediated function in patients with bronchial asthma and ragweed allergy. Modification of airway histamine-receptor function with methylprednisolone succinate. The effect of ranitidine, alone and in combination with clemastine, on allergen induced cutaneous wheal and flare reactions in human skin. A comparison of the actions of H 1 and H2 antihistamines on histamine-induced bronchoconstriction and cutaneous wheal response in asthmatic patients. The effects of combined H 1 and H2 histamine antagonists on alterations in nasal airflow resistance induced by topical histamine provocation. Significance of H 1 and H2 receptors in the human nose: rationale for topical use if combined antihistamine preparations. Too often, however, inadequate attention is directed to the nature of the allergen in an allergic response. The first and foremost treatment recommendation for allergies is avoidance of the trigger. Such advice is impossible to render without an intimate familiarity with the nature of common environmental allergens. This chapter presents a comprehensive yet lucid overview of allergen biology for the clinician. In atopic diseases, allergens are antigens that elicit an immunoglobulin E (IgE) antibody response. Other methods, usually restricted to research laboratories, also may be used to demonstrate the presence of specific IgE antibody. When assessing the contribution of a particular antigen to an observed symptom, the nature of the immune response must be clarified. The clinician must differentiate the allergic (or atopic) response from the nonallergic immune response to certain drug or microbial antigens that induce the formation of other antibody isotypes (e. The allergic response also demonstrates a distinct pathophysiologic mechanism compared with that seen in delayed hypersensitivity reactions, which result from contact antigens. Allergens most commonly associated with atopic disorders are inhalants or foods, reflecting the most common entry sites into the body. Drugs, biologic products, insect venoms, and certain chemicals also may induce an immediate-type reaction. The allergenic molecules generally are water soluble and can be easily leached from the airborne particles. They react with IgE antibodies attached to mast cells, initiating a series of pathologic steps that result in allergic symptoms. This chapter is confined to the exploration of these naturally occurring inhalant substances; other kinds of allergens are discussed elsewhere in this text. The chemical nature of certain allergens has been studied intensively, although the precise composition of many other allergens remains undefined ( 1). For others, the physiochemical characteristics or the amino acid sequence is known. Still other allergens are known only as complex mixtures of proteins and polypeptides with varying amounts of carbohydrate. Details of the chemistry of known allergens are described under their appropriate headings ( 2). The methods of purifying and characterizing allergens include biochemical, immunologic, and biologic techniques. The methods of purification involve various column fractionation techniques, newer immunologic techniques such as the purification of allergens by monoclonal antibodies, and the techniques of molecular biology for synthesizing various proteins. All of these purification techniques rely on sensitive and specific assay techniques for the allergen. Aeroallergens are named using nomenclature established by an International Union of Immunologic Societies subcommittee: the first three letters of the genus, followed by the first letter of the species and an Arabic numeral ( 3). Commonly encountered allergens For a particle to be clinically significant as an aeroallergen, it must be buoyant, present in significant numbers, and allergenic. Fungal spores are ubiquitous, highly allergenic, and may be more numerous than pollen grains in the air, even during the height of the pollen season. The above allergens are emphasized because they are the ones most commonly encountered, and they are considered responsible for most of the morbidity among atopic patients. Others may be associated with occupational exposures, as is the case in veterinarians who work with certain animals (e. Some sources of airborne allergens are narrowly confined geographically, such as the mayfly and the caddis fly, whose scales and body parts are a cause of respiratory allergy in the eastern Great Lakes area in the late summer. In addition, endemic asthma has been reported in the vicinity of factories where cottonseed and castor beans are processed. Airborne pollens are in the range of 20 to 60 m in diameter; mold spores usually vary between 3 and 30 m in diameter or longest dimension; house dust mite particles are 1 to 10 m. Protective mechanisms in the nasal mucosa and upper tracheobronchial passages remove most of the larger particles, so only those 3 m or smaller reach the alveoli of the lungs. Hence, the conjunctivae and upper respiratory passages receive the largest dose of airborne allergens.

buy 100mg extra super levitra visa

Some reports show that the average smoker makes between six to nine serious attempts until they enjoy success and that over 70% of all smokers buy extra super levitra 100 mg amex, wish they could quit order 100 mg extra super levitra amex. Indeed, if the negative effects of tobacco abstinence such as missing not smoking could be eliminated, the percentage of smokers wanting to quit would climb dramatically. Indeed, it is now possible to help smokers quit with virtually no pain and little, if any, discomfort. These successes are even more remarkable because they were obtained immediately after the devastating and traumatic effects of the terrorist attacks of 9/11. Self-Help for Tobacco Dependent Fire Fighters and other First-Responders human brain. Measuring Your Tobacco Addiction Karl Fagerstrm, a renowned Swedish tobacco addiction researcher over 20 years ago, designed a simple six question test to measure the severity of a smoker s nicotine addiction. The Fagerstrm Test for Nicotine Dependence has also been adapted for smokeless oral tobacco as well (Tables 4-4. Fagerstrm Test for Nicotine Dependence 10 or less 0 11 to 20 1 How many cigarettes per day do you usually smoke? Any other one 0 Do you smoke more frequently in the frst hours after No 0 waking than during the rest of the day? Yes 1 Scoring: 0-1 Very Low 2-3 Low 5-7 Moderate 7-8 High 9-10 Very High Table 4-4. For example, has a doctor told you that your health is being damaged by your smoking and yet, you continue to smoke? Even if smoking is not the direct cause of your illness, for most illnesses smoking is contributing to your continued deteriorating health and if despite knowing this you continue to smoke then your addiction is severe. Are you avoiding family members, friends or events because smoking is difficult or forbidden? Years ago, we had a smoking patient who refused to visit her grandchildren because her son-in-law forbade her smoking in the presence of the children. If you are avoiding significant people and events in your life so your smoking is undisturbed, your addiction is severe. If your workplace prohibits smoking and you are risking termination by smoking where it is forbidden, you are severely addicted. Self-Help for Tobacco Dependent Fire Fighters and other First-Responders 331 Modifed Fagerstrm Test for Smokeless Oral Tobacco Use After a normal sleeping period, do you use smokeless Yes 1 tobacco within 30 minutes of waking? No 0 Do you experience strong cravings for a dip or chew when Yes 1 you go for more than two hours without one? No 0 <9 0 On average, how many minutes do you keep a fresh dip or 10 - 19 1 chew in your mouth? Realizing that nicotine is such a strong addiction and that help is available is the first step to a conquering addiction and enjoying a lifetime of freedom from tobacco and improved physical fitness and health. The good news is modern day tobacco cessation therapies can not only minimize the discomfort that occurs when stopping but can also help you even if you are not ready to put down your cigarettes today. While the vast majority of all smokers want to stop, it is completely normal to have mixed feelings and experience aborted efforts and missteps. Quitting is a process and much can be learned from previous efforts even if you feel they were less than successful. Each attempt is a step towards success, especially if we can work together to determine the reasons for past missteps in the journey towards tobacco freedom and then construct a plan that tries to remove those barriers. For example, we recently saw a 30 cigarette-per-day fire fighter who had used a 21 mg transdermal nicotine patch and had reduced his cigarette consumption to seven cigarettes daily. During our evaluation, he reported a common response to this type of situation: The patch didn t work. Self-Help for Tobacco Dependent Fire Fighters and other First-Responders him that (to use firefighting language) the patch started to knock down his smoking addiction, it just did not go far enough. The 21 mg nicotine patch which delivers nicotine s-l-o-w-l-y through the skin (compared to smoking nicotine), was not designed to replace 100% of the inhaled nicotine from all the cigarettes for every smoker. Think about this: Elephants and mice like all mammals can develop bacterial upper respiratory infections. Does it make sense to fight a fire with the same number of fire fighters that has involved an entire city block as it does to knockdown a simple mattress fire? Similarly, why would we want to treat a 30 or 40 cigarette per day smoker the same as, say, a person who smokes five cigarettes per day? At this point you are probably wondering Isn t it unsafe to continue to smoke while using, say, the nicotine patch or gum? In fact, this a great way to help ambivalent or less than fully ready smokers to start on the road to better health as long as they make the commitment to eventually become tobacco free. Reduction to Cessation Treatments (Reduce then Quit) Let s say you smoke 25 cigarettes per day and want to cut-down but you re not ready to quit. Perhaps you refuse to quit now or maybe prior quit attempts failed due to severe cessation anxiety (the anxiety that occurs when contemplating quitting). Such patients can benefit from a reduction to cessation treatment approach where medication is started prior to quitting. For example, if you smoke 20 to 30 cigarettes per day, do you think you could use a 21 milligram transdermal nicotine patch to cut-down gradually to 10-15 cigarettes daily? Public Health Service working out of the Office of the Surgeon General released new guidelines to help clinicians treat tobacco addiction. They concluded, among other things, that Reduction to Quit treatment plans are not only safe and effective, but some studies show that they may even increase success rates. Over the years, we have treated many hundreds of smokers with a Reduction to Cessation protocol. The number of smokers who experienced any problems with this type of plan could be counted on one hand. This was transient and usually eliminated by reducing the daily number of smoked cigarettes. Sometimes the smoker will continue to smoke fewer and fewer cigarettes spontaneously until they just stop. Self-Help for Tobacco Dependent Fire Fighters and other First-Responders 333 nicotine gum, inhalers, or nicotine nasal spray to reach complete abstinence. Combinations of these medications are also recommended by the new federal tobacco addiction treatment guidelines. First, it is impossible to change a behavior if you are unaware of precisely what that behavior is. Self-Help for Tobacco Dependent Fire Fighters and other First-Responders Second, the action of recording a cigarette in real-time (as it is smoked) helps the smoker become more aware of the act of smoking and this can help eliminate those cigarettes smoked just out of habit. Keeping a cigarette log can help understand patterns and that in itself may reduce tobacco use and will certainly help you and your doctor/ healthcare professional and tobacco treatment specialist create an individualized cessation treatment program and gauge your progress. No Ashtrays Instead Use a Cigarette Coughee Jar Another good technique is to eliminate all the ashtrays from wherever you smoke and to substitute a cigarette coughee jar. Use this now as your one and only ashtray into which you deposit all your cigarette ashes and discarded butts. Especially if you live with small children or other non-smokers, it is best to bring your cigarette jar with you and smoke outside. All non-smokers are affected by tobacco smoke and the health of children is dramatically harmed by the smoking of adults. Before lighting up a new cigarette unscrew the jar and inhale a deep whiff of all those stale butts and ashes. Doing this regularly, each and every time you smoke will help break the positive association to your cigarettes and help you to conquer your addiction. Increase the Inconvenience of Smoking Buy only one pack at a time, no more cartons of cigarettes or multiple packs lying around. During a Reduction to Cessation plan, you can smoke up to your cut-down goal but you do not want to smoke automatically when you don t really want to, simply because they are lying around. Take Inventory and Do a Balance Sheet It is important to understand why you are thinking of quitting the smoking habit, trying to be as specific as you can. For example, don t just say you are quitting for health, instead state I am more short of breath climbing up stairs on a run or forcing entry than I was a few years ago or my doctor says my lungs and heart are being damaged by my smoking. Take the list out and review it frequently; a great time to review your list is while smoking. A particularly good technique: One fire fighter who was quitting for his wife and family placed a picture of them without him between the cellophane and his pack of cigarettes. Every time he smoked, he imagined his family surviving without him after he died from a disease caused by tobacco.

Management of adverse reactions to prophylactic trimethoprim-sulfamethoxazole in patients with human immunodeficiency virus infection buy 100 mg extra super levitra with mastercard. Successful oral desensitization to trimethoprim-sulfamethoxazole in acquired immune deficiency syndrome order 100 mg extra super levitra with visa. Successful desensitization of two patients who previously developed Stevens-Johnson syndrome while receiving trimethoprim-sulfamethoxazole. Acute desensitization of a patient with cystic fibrosis allergic to both B-lactam and aminoglycoside antibiotics. Amphotericin B: emergency challenge in a neutropenic, asthmatic patient with fungal sepsis. Treatment of tuberculosis in patients with advanced human immunodeficiency virus infection. Aspirin sensitive rhinosinusitis: the clinical syndrome and effects of aspirin administration. Aspirin idiosyncrasy in systemic mast cell disease: a new look at mediator release during aspirin desensitization. Incidence of bronchoconstriction due to aspirin, azo dyes, non-azo-dyes and preservatives in a population of perennial asthmatics. Aspirin-sensitive rhinosinusitis/asthma: spectrum of adverse reactions to aspirin. The pivotal role of 5-lipoxygenase products in the reaction of aspirin-sensitive asthmatics to aspirin. Diagnosis, prevention, and treatment of adverse reactions to aspirin and nonsteroidal anti-inflammatory drugs. Aspirin in chronic urticaria and/or angioedema: studies of sensitivity and desensitization. Aspirin desensitization in aspirin-sensitive asthmatic patients: clinical manifestations and characterization of the refractory period. Inhaled lysine-aspirin as a bronchoprovocation procedure in aspirin-sensitive asthma: its repeatability, absence of late-phase reaction, and the role of histamine. Prevalence of cross-reactivity with acetaminophen in aspirin-sensitive asthmatic subjects. Hydrocortisone sodium succinate does not cross-react with aspirin in aspirin-sensitive patients with asthma. Nearly fatal episodes of hypotension, flushing, and dyspnea in a 47-year-old woman. Acetaminophen anaphylaxis with aspirin and sodium salicylate sensitivity: a case report. Adverse reactions to ionic and nonionic contrast media: a report from the Japanese Committee on the safety of contrast media. Safety and cost effectiveness of high-osmolality as compared with low-osmolality contrast material in patients undergoing cardiac angiography. The risk of death and of severe nonfatal reactions with high-versus low-osmolality contrast media: a meta-analysis. Food and Drug Administration 1978 1994: effect of the availability of low-osmolality contrast media. The prevention of immediate generalized reactions to radiocontrast media in high-risk patients. The use of iohexol in patients with previous reactions to ionic contrast material. Effects of beta-adrenergic and calcium antagonists on the development of anaphylactoid reactions from radiographic contrast media during cardiac angiography. Increased risk for anaphylactoid reaction from contrast media in patients on B-adrenergic blockers or with asthma. Acute reactions to urographic contrast medium: Incidence, clinical characteristics and relationship to history of hypersensitivity states. Pretreatment with corticosteroids to prevent adverse reactions to nonionic contrast media. Prevention of radiographic contrast-agent induced reductions in renal function by acetylcysteine. Provocative challenge with local anesthetics in patients with a prior history of reaction. An approach to the patient with a history of local anesthetic hypersensitivity: experience with 90 patients. Administration of local anesthetics to patients with a history of a prior reaction. Black Americans have an increased rate of angiotensin converting enzyme inhibitor associated angioedema. Antiotensin converting enzyme inhibitor-induced angioedema more prevalent in transplant patients. Anaphylaxis to cisplatin: diagnosis and value of pretreatment in prevention of recurrent allergic reactions. Medication use and the risk of Stevens-Johnson syndrome or toxic epidermal necrolysis. Erythema multiforme to phenobarbital: involvement of eosinophils and T cells expressing the skin homing receptor. Immediate hypersensitivity to human recombinant-macrophage colony-stimulating associated with a positive prick skin test reaction. Dermal hypersensitivity reaction to insulin: correlations of three patterns to their histopathology. Adverse reactions to protamine sulfate during cardiac surgery in diabetic and non-diabetic patients. Allergic reactions to streptokinase consistent with anaphylactic or antigen-antibody complex mediated damage. Short-course thrombolysis as the first line of therapy for cardiac valve thrombosis. Extractable latex allergens and proteins in disposable medical gloves and other rubber products. Reduction of latex aeroallergens and latex-specific IgE antibodies in sensitized workers after removal of powdered natural rubber latex gloves in a hospital. Anaphylactic reactions after gamma globulin administration in patients with hypogammaglobulinemia: detection of IgE antibodies to IgA. Case reports of evaluation and desensitization for anti-thymocyte globulin hypersensitivity. Clinical effects of monoclonal antibody 17-1A combined with granulocyte/macrophage-colony-stimulating factor and interleukin-2 for treatment of patients with advanced colorectal carcinoma. Inhibitors of tumor necrosis factor: new treatment options for rheumatoid arthritis. Antitumor necrosis factor therapy for inflammatory bowel disease: a review of agents, pharmacology, clinical results, and safety. Reduction of the occurrence of acute cellular rejection among renal allograft recipients treated with basiliximab, a chimeric anti- interleukin-2-receptor monoclonal antibody. Hypersensitivity reactions to Escherichia coli-derived polythylene glycolated-asparaginase associated with subsequent immediate skin test reactivity to E. Reports of three cases of cutaneous reactions to granulocyte macrophage colony stimulating factor and a review of the literature. Rapid method for detection of anti-recombinant human erythropoietin antibodies as a new form of erythropoietin resistance. Neutralizing antibodies to interferon-alpha: relative frequency in patients treated with different interferon preparations. Epitopes recognized by neutralizing therapy-induced human anti-interferon-alpha antibodies are localized within the N-terminal functional domain of recombinant interferon-alpha 2. Safety and effectiveness of long-term interferon-g therapy in patients with chronic granulomatous disease. Anti-interferon-g antibodies in a patient undergoing interferon-g treatment for systemic mastocytosis. Use of recombinant human follicle-stimulating hormone for in vitro fertilization-embryo transfer after severe systemic immunoglobulin E-mediated reaction to urofollitropin. Recombinant follicle-stimulating hormone in a patient hypersensitive to urinary-derived gonadotropin. Acute urticaria caused by subcutaneous recombinant hirudin: evidence for an IgE-mediated hypersensitivity reaction.

Penetration into the ribs and chest wall and spread to local lymph nodes is not uncommon generic extra super levitra 100mg online. As the tumor grows more bulky buy 100 mg extra super levitra with amex, it can compress the underlying lung, markedly impairing lung function. The disease often presents with chest pain and shortness of breath, frequently due to pleural effusions, which prompt initial medical attention. The diagnosis is made on the basis of microscopic examination of cells separated from pleural fluid or, more commonly, tissue obtained by closed pleural biopsy or by thoracoscopy. Special tissue staining techniques (immunohistological staining) and/or assessment using high magnification electron microscopy is often necessary to establish the diagnosis with certainty. Treatment of Malignant Mesothelioma Advances in the treatment of malignant mesotheliomas of the chest and abdomen have occurred in the past 10 years. However, prognosis remains poor with the majority of patients surviving no more than 13 months after diagnosis. Chemotherapy alone with permatrexed (Alimta ) may extend life an average of three months and with a measurable improvement in the quality of life during that time compared with those who are untreated. For some, surgery, accompanied by washes of the chest or abdomen with heated chemotherapy solutions, has resulted in surviving more than five years after diagnosis. Nevertheless, treatment remains ineffective for the great majority of patients, and prevention remains the key approach to mesothelioma from a public health perspective. The key to preventing asbestos-related scarring and cancer is the use of respirators that will trap the great majority of the fine asbestos fibers before they are inhaled. Studies of other asbestos-exposed occupations have demonstrated that family members can be placed at risk for asbestos-related disease when workers bring their dusty work clothing home to be laundered9, often contaminating the family car in the process. Fire fighters should take appropriate measures to ensure that dust from the fire site is not brought home, especially because young children may be at special risk for mesothelioma decades later, even following relatively low exposure levels. Given the evidence of asbestos-related disease among fire fighters, consideration should be given to medical screening for asbestos-related scarring and cancers among particular groups of fire fighters whose risk of exposure to asbestos-containing materials is greatest. Earlier disease detection may make curative treatment possible for some asbestos-associated cancers. Screening presents an opportunity for education on the health hazards of asbestos and for emphasizing the importance of eliminating further exposure. Prevention of disease can be achieved through the reduction of other risk factors, such as smoking. Screening also assists in epidemiological surveillance of diseases caused by exposure to asbestos. Sleep apnea is a condition in which a person literally stops breathing repeatedly during sleep, sometimes hundreds of times during a single night. The medical definition of apnea means not breathing for ten seconds, but often in people with sleep apnea syndrome these episodes are longer. Although people wake up gasping for breath, often they are unaware of these apneic episodes. The disordered breathing that arises from these repeated episodes of apneas during sleep when also associated with daytime sleepiness is referred to as sleep apnea syndrome. Approximately 50% of adults in the United States experience intermittent sleep problems and 20% of adults report chronic sleep disturbance. Sleep disturbances often lead to daytime sleepiness that may interfere with daytime activity and cause serious functional impairment. Normally, daily sleep and wake alternates on a circadian rhythm of approximately 25 hours, also known as the biological clock. Typically there is a midday sleep surge, but the accumulated sleep factor(s) are offset by a circadian wake-sleep mechanism that maintains wakefulness during the day. Sleep ensues when the wake portion of the circadian mechanism is turned off and the accumulated sleep factor(s) become relatively unopposed. This circadian rhythm is initiated and controlled by an area of the brain called the suprachiasmatic nuclei of the hypothalamus, and the light-dark cycle is mediated through the retinohypothalamic tract. Even low intensity light signals reset this rhythm every day so that changes in duration of daylight during different seasons are accommodated accordingly. Along with other various clues, a pineal hormone called melatonin, mostly secreted at night, serves as a trigger for the need to sleep. When the pharyngeal obstruction is such that the airflow is shallow and not completely reduced the event is termed a hypopnea. Apnea-hypopnea occurring more frequently than five events per hour is abnormal, however. Often apneas are associated with arousals and the number of arousals per hour of sleep is called the arousal index. In 1964, an illustration showing an obese, hypersomnolent and myxedematous woman with airflow cessation was published, but the authors did not realize the importance of this observation at that time. Gastaut et al in 19652, first described three types of apnea, in a patient with Pickwickian Syndrome. Epidemiology Obstructive sleep apnea is an increasingly recognized disorder that affects more than 12 million people in the United States. For example non-obese patients with micrognathia (an abnormally small lower jaw) or retrognathia (a receding chin) may have sleep apnea. Therefore, presence of certain clues in the medical history and physical examination should heighten the suspicion of obstructive sleep apnea. Features Contributing to Sleep Apnea Syndrome Obesity (increased body mass index) Increased neck circumference (men 18+ inches; women 16+ inches) Anatomic abnormalities (e. It must be collapsible during speech and swallowing, but it must remain open during breathing. This complex function is accomplished by a group of muscles that can alter the shape of the pharynx during speaking or swallowing, while keeping it open during breathing. The upper airway muscles actually pull on the pharynx to maintain its open position during breathing. Loss of needed compensatory mechanisms imposed by sleep may lead to partial or complete collapse of the upper airway. Partial collapse results in snoring and hypopnea, whereas complete collapse results in episodes of apnea. During the obstructive apneic episodes the individual continues to try to breathe against the closed upper airway. Carbon dioxide tension increases, oxygen tension decreases and secretion of an increased amount of flight or fight catecholamines (norepinephrine) intensify the effort to breathe. During the aroused state the upper airway muscles are activated and in turn the pharynx opens. Thus, a vicious cycle of breathing without sleep and sleeping without breathing is set in motion. Therefore, a focused history from people as well as their partners who have observed their disturbed sleep behavior can be crucial in identifying persons at risk for sleep apnea. They may doze off watching television, reading, at the dinner table, in waiting areas and during conversation. This disorder frequently impairs driving and is a major cause of serious automobile accidents. Common clinical manifestations of obstructive sleep apnea are listed in Table 2-11. Therefore people with reports of daytime sleepiness, loud snoring and choking should be considered for a sleep study. These measurements enable the diagnosis of both pulmonary and non-pulmonary disorders of sleep. Soon after the resumption of the breathing, the person resumes sleep and apnea recurs to repeat the cycle. Proper evaluation of the patient should include a sleep sample sufficient to establish the diagnosis and severity of sleep apnea. A polysomnogram performed in a sleep laboratory is the gold standard to diagnose obstructive sleep apnea. We believe, however, that at this time these studies may provide ambiguous or limited information. In-home sleep studies may be useful, however, to screen presumed at risk individuals for laboratory sleep studies.

B. Jarock. College of Saint Mary.

Compare