By S. Brenton. University of Georgia.
A properly performed sweat chloride test is essential discount astelin 10 ml otc, as is proper performance of other laboratory tests astelin 10 ml otc. In the outpatient management of asthma order astelin, determination of the presence or absence of antiallergen IgE is of value. For decades, skin testing for immediate cutaneous reactivity has been the most sensitive and specific method. One cannot emphasize enough the need for high quality control for both skin testing and in vitro testing. The experienced physician should use either method of demonstration of antiallergen IgE as adjunctive to, rather than a substitute for, the narrative history of asthma. More patients have immediate cutaneous reactivity or detectable in vitro IgE than have asthma that correlates with exposure to the specific allergen. Some patients develop psychological abnormalities because of the burden of a chronic illness such as asthma. Ineffectively treated asthma in children can result in chest wall abnormalities, such as pigeon chest, because of sustained hyperinflation of the chest. In general, long-term asthma does not result in irreversible obstructive lung disease. However, an occasional patient with long-term asthma develops apparently irreversible disease in the absence of cigarette smoking, a 1-antitrypsin disease, or other obvious cause ( 141). Usually, these patients have childhood-onset asthma and are dependent on oral corticosteroids. Nevertheless, pulmonary physiologic studies do not reveal return of parameters to the expected normal ranges. Asthma patients are not deficient in antiproteases that can be measured, and they do not have bullous abnormalities on chest radiographs. Pneumomediastinum or pneumothorax can occur in patients presenting in status asthmaticus. Neck, shoulder, or chest pain is common, and crepitations can be detected in the neck or supraclavicular fossae. Rupture of distal alveoli results in dissection of air proximally through bronchovascular bundles. The air can then travel superiorly in the mediastinum to the supraclavicular or cervical areas. At times, the air dissects to the face or into the subcutaneous areas over the thorax. Fatalities from asthma are unnecessary because asthma is not an inexorably fatal disease. Uncontrolled asthma can lead to mucus plugging of airways and frank collapse of a lobe or whole lung segment. Cough syncope or cough associated cyanosis occurs in patients whose respiratory status has deteriorated and in whom status asthmaticus or need for emergency therapy has occurred. During severe airway obstruction from asthma, during inspiration, intrathoracic pressure is negative because the patient must generate very high negative pressures to apply radial traction on bronchi in an attempt to maintain their patency. During expiration, the patient must overcome severe airway resistance and premature airways collapse. Increases in intrathoracic pressure during expiration with severe coughing, as compared with intraabdominal pressure, causes a decline in venous return to the right atrium. There may also be increased blood flow to the lung during a short inspiration, but that is accompanied by pooling in the pulmonary vasculature from the markedly elevated negative inspiratory pressure. There will be reduced blood flow to the left ventricle with temporary decreases in cardiac output and cerebral blood flow. Pulsus paradoxus is present when there is greater than a 10-mm Hg decline in systolic blood pressure during inspiration. The most frequent electrocardiographic findings during acute asthma are sinus tachycardia followed by right axis deviation, clockwise rotation, prominent R in lead V1 and S in lead V5, and tall peaked P waves consistent with cor pulmonale (151). Administration of oral corticosteroids is indicated to prevent repeated hospitalizations and frequent episodes of wheezing dyspnea. Alternate-day prednisone and recommended doses of inhaled corticosteroids do not result in growth retardation, especially when the dose is 30 mg on alternate days or less. Even high alternate-day doses in children can be tolerated reasonably well as long as status asthmaticus is prevented. Similarly, depot corticosteroids given every 2 to 3 weeks in high doses may result in growth retardation. The use of depot corticosteroids should be considered only in the most recalcitrant children in terms of asthma management. Ineffective parental functioning or poor compliance usually accompanies such cases in which reliable administration of prednisone and inhaled corticosteroids is impossible. The term malignant, potentially fatal asthma has been suggested for such patients (153). Psychological Factors Asthma has evolved from a disorder considered to be psychological to one recognized as extremely complex ( 127) and of unknown etiology. Psychological stress can cause modest reductions in expiratory flow rates such as occur during watching a terrifying movie ( 154).
In contrast to decongestant nasal sprays buy 10 ml astelin overnight delivery, patients should be informed that intranasal steroids should be used prophylactically and that maximum benefit is not immediate and may take weeks buy astelin 10 ml mastercard. Although a delayed onset of action with the intranasal steroids may occur in some patients discount astelin online american express, well-controlled studies ( 129,130,131 and 132) have shown that many patients have a clinically evident onset of effect during the first day of administration. Some studies suggest that intranasal steroids can be used on an as-needed basis by many patients, but for some patients, optimal effectiveness can be achieved only with regular use ( 133,134). Intranasal Corticosteroid Injection Intranasal corticosteroid injections have been used for clinical practice in the management of patients with common allergic and nonallergic nasal conditions such as nasal polyposis. With the advent of newer and safer intranasal steroids, the use of this technique has decreased in recent years. Turbinate injections have two major adverse effects that are not seen with intranasal corticosteroid sprays: (a) adrenal suppression secondary to absorption of the steroid, and (b) absorption of steroid emboli, which may lead to transient or permanent loss of vision ( 135). Systemic Corticosteroids Systemic corticosteroids are regarded by many allergists as inappropriate therapy for patients with mild to moderate allergic rhinitis. Although rhinitis is not a threat to life, it can seriously impair the quality of it, and some patients respond only to corticosteroids. Also, when the topical steroid cannot be adequately distributed in the nose because of marked obstruction, it will not be effective. In such cases, the blocked nose can be opened by giving a systemic corticosteroid for 3 to 7 days, and the improvement can then be maintained by the topical corticosteroid spray. It is essential always to relate the risk for side effects to the dosage given, and especially to the length of the treatment period. When short-term systemic steroid treatment is given for 1 to 2 weeks, it can be a valuable and safe supplement to topical treatments in the management of severe allergic rhinitis or nasal polyposis. As in the use of topical corticosteroids, however, systemic steroids should be reserved for severe cases that cannot be controlled by routine measures and should be used for a limited period and never on a chronic basis. Anticholinergics Ipratropium is an anticholinergic drug that was released in recent years for treatment of chronic bronchitis and chronic obstructive lung disease. It has a quaternary ammonia structure, which gives this medication high topical activity, but because of its structure, there is no appreciable absorption of this medication across mucosal barriers. Therefore, the unpleasant anticholinergic side effects commonly associated with atropine are not experienced with this medication. Because cholinergic mechanisms in the nose may lead to hypersecretion and blood vessel dilation, interest in this medication has increased. Ipratropium decreases the watery rhinorrhea in patients with perennial rhinitis ( 136) and reduces nasal drainage in patients with the common cold or vasomotor rhinitis ( 137). Unfortunately, it has no appreciable effect on obstruction or sneezing in patients with rhinitis. Intranasal Cromolyn Cromolyn sodium is a derivative of the natural product khellin. The proposed mechanism of action of cromolyn in allergic rhinitis is to stabilize mast cell membranes, apparently by inhibiting calcium transmembrane flux and thereby preventing antigen-induced degranulation. It has been reported to be effective in the management of seasonal and perennial allergic rhinitis ( 138,139). Cromolyn can be effective in reducing sneezing, rhinorrhea, and nasal pruritus ( 140,141) but is minimally useful in nonallergic types of rhinitis and nasal polyps ( 142) and has little effect on mucociliary transport. Cromolyn often prevents the symptoms of both seasonal and perennial allergic rhinitis, and diligent prophylaxis can significantly reduce both immediate and late symptoms after allergen exposures ( 143). Patients also may experience mucosal irritation due to the preservatives benzalkonium chloride and ethylenediaminetetraacetic acid. For management of seasonal rhinitis, treatment should begin 2 to 4 weeks before contact with the offending allergens and should be continued throughout the period of exposure. Because cromolyn has a delayed onset of effect, concurrent antihistamine therapy is usually necessary to control symptoms. It is essential for the patient to understand the rate and extent of response to be expected from intranasal cromolyn and that, because the product is prophylactic, it must be used on a regular basis for maximum benefit. Several studies have compared the therapeutic efficacy of cromolyn nasal solution with that of the intranasal corticosteroids in allergic rhinitis. In both perennial (144,145) and seasonal allergic rhinitis ( 146,147), intranasal steroids have been reported to be more effective than cromolyn. Nedocromil sodium is a pyranoquinolone dicarboxylic acid derivative that is reported to be effective against both mucosal and connective tissue type mast cells. In contrast, cromolyn sodium appears to be effective only against connective tissue type mast cells. Nedocromil has been reported to be effective in seasonal and perennial allergic rhinitis ( 148).