Phillip Fairweather, M.D.

• Clinical Assistant Professor
• Mount Sinai School of Medicine
• New York, NY
• Department of Emergency Medicine
• Elmhurst Hospital Center
• Elmhurst, NY

Classification of allergic reactions responsible for clinical hypersensitivity and disease depression symptoms remedies generic clomipramine 10 mg on-line. The role of a documented allergic profile as a risk factor for radiographic contrast media reaction mood disorders symptoms 50 mg clomipramine buy. Relationship of acetyl transferase activity to antinuclear antibodies and toxic symptoms in hypertensive patients treated with hydralazine depression symptoms shortness of breath order clomipramine pills in toronto. Effect of acetylator phenotype on the rate at which procainamide induces antinuclear antibodies and the lupus syndrome mood disorder 1 purchase clomipramine us. Diagnosis of sulfonamide hypersensitivity reactions by in-vitro "rechallenge" with hydroxylamine metabolites depression of 1920 clomipramine 25 mg low cost. Genetic variants associated with phenytoin-related severe cutaneous adverse reactions. Mass spectrometric characterization of circulating and functional antigens derived from piperacillin in patients with cystic fibrosis. Allopurinol use and risk of fatal hypersensitivity reactions: a nationwide population-based study in Taiwan. Detection of human herpesvirus-6 transcripts in carbamazepine-induced hypersensitivity syndrome by in situ hybridization. Occupational trichloroethylene hypersensitivity syndrome: human herpesvirus 6 reactivation and rash phenotypes. Clinicopathologic analysis of coxsackievirus a6 new variant induced widespread mucocutaneous bullous reactions mimicking severe cutaneous adverse reactions. Drugs and other agents involved in anaphylactic shock occurring during anaesthesia. A prospective study of the risk of an immediate adverse reaction to protamine sulfate during cardiopulmonary bypass surgery. IgE against ethylene oxidealtered human serum albumin in patients with anaphylactic reactions to dialysis. Plasma histamine but not anaphylatoxin levels correlate with generalized urticaria from infusions of anti-lymphocyte monoclonal antibodies. The incidence and management of infusion reactions to infliximab: a large center experience. Human serum sickness: a prospective analysis of 35 patients treated with equine anti-thymocyte globulin for bone marrow failure. Immunology of a serum sickness/vasculitis reaction secondary to streptokinase used for acute myocardial infarction. Serum sickness-like reactions to amoxicillin, cefaclor, cephalexin, and trimethoprim-sulfame-thoxazole. A prospective clinical and 746 immunologic analysis of patients with serum sickness. Etanercept-induced lupus erythematosus presenting as a unilateral pleural effusion. Complement system protein C4 and susceptibility to hydralazine-induced systemic lupus erythematosus. Antibodies to nuclear anti-gens in patients treated with procainamide or acetylprocainamide. Remission of procainamideinduced lupus erythematosus with N-acetylprocainamide therapy. Graft-versus-host reactions: clues to the etiopathology of a spectrum of immunological disease. The American College of Rheumatology 1990 criteria for the classification of vasculitis. A report from the Boston Collaborative Drug Surveillance Program on 15,438 consecutive inpatients, 1975 to 1982. Angio-oedema in relation to treatment with angiotensin converting enzyme inhibitors. Severe angioedema after long-term use of an angiotensin-converting enzyme inhibitor. Prevalence and relevance of allergic reactions in patients patch tested in North America-1984 to 1985. Clinical pattern of cutaneous drug eruption among children and adolescents in North India. Postcoital fixed drug eruption in a man sensitive to trimethoprim-sulphamethoxazole. The interaction between keratinocytes and T cells-an overview of the role of adhesion molecules and the characterization of epidermal T cells. Possible role of Fas/Fas ligand-mediated apoptosis in the pathogenesis of fixed drug eruption. Topical provocation in 31 cases of fixed drug eruption: change of causative drugs in 10 years. Acute generalized exanthematous pustulosis: pathogenesis, genetic background, clinical variants and therapy. Acute generalized exanthematous pustulosis: role of cytotoxic T cells in pustule formation. Erythema multiforme: a critical review of characteristics, diagnostic criteria, and causes. Cutaneous immunofluorescence study of erythema multiforme: correlation with light microscopic patterns and etiologic agents. Drug-induced, photosensitive, erythema multiforme-like eruption: possible role for cell adhesion molecules in a flare induced by Rhus dermatitis. Erythema multiforme: microvascular damage and infiltration of lymphocytes and basophils. Lymphocyte subsets and Langerhans cells/indeterminate cells in erythema multiforme. Stevens­Johnson syndrome and toxic epidermal necrolysis: assessment of medication risks with emphasis on recently marketed drugs. Adverse reactions during imatinib and lansoprazole treatment in gastrointestinal stromal tumors. Corticosteroid therapy in an additional 13 cases of Stevens­Johnson syndrome: a total series of 67 cases. Petechiae, ecchymoses, and necrosis of skin induced by coumarin congeners: rare, occasionally lethal complication of anticoagulant therapy. Clinical classification of cases of toxic epidermal necrolysis, Stevens­Johnson syndrome, and erythema multiforme. Toxic epidermal necrolysis treated with lowdose intravenous immunoglobulin: immunohistochemical study of Fas and Fas-ligand expression. Intravenous immunoglobulin use in patients with toxic epidermal necrolysis and Stevens­Johnson syndrome. Pathogenesis and recent therapeutic trends in Stevens­Johnson syndrome and toxic epidermal necrolysis. Use of intravenous immunoglobulin in toxic epidermal necrolysis and Stevens­Johnson syndrome: our current understanding. Hypersensitivity to pancreatic extracts in parents of patients with cystic fibrosis. Dyspnoea, asthma, and bronchospasm in relation to treatment with angiotensin converting enzyme inhibitors. Low-dose amiodarone-induced pneumonitis: evidence of an immunologic pathogenetic mechanism. Fatal pulmonary failure complicating high-dose cytosine arabinoside therapy in acute leukemia. A Mechanism of cell destruction in individuals sensitized to foreign antigens and its implications in auto-immunity. Heparin-induced thrombocytopenia: studies with a new low molecular weight heparinoid, Org 10172. Current understanding of the mechanisms of idiosyncratic drug-induced agranulocytosis. Evidence for expression in human liver of halothane-induced neoantigens recognized by antibodies in sera from patients with halothane hepatitis. Enflurane metabolism produces covalently bound liver adducts recognized by antibodies from patients with halothane hepatitis. Acute interstitial nephritis with glomerulopathy due to nonsteroidal anti-inflammatory agents: a review of its clinical spectrum and effects of steroid therapy. Association of protamine IgE and IgG antibodies with life-threatening reactions to intravenous protamine. Sulfonamide-reactive lymphocytes detected at very low frequency in the peripheral blood of patients with drug-induced eruptions. A decade of penicillin related acute interstitial nephritis-more questions than answers. Toxic epidermal necrolysis and Stevens Johnson syndrome: our current understanding. Cross-reactivity between penicillins and cephalosporins: clinical and immunologic studies. Desensitization (induction of drug tolerance or drug provocation testing) to these immunoglobulin E (IgE)-mediated reactions renders mast cells specifically unresponsive to only the drug antigen used for desensitization. In many patients, successful desensitization is accompanied by a marked decrease or transient disappearance of the cutaneous wheal-and-flare response. Similar changes in skin test responses have been reported following successful desensitization to vancomycin (1), aminoglycosides (2), and carboplatin (3). The term desensitization has been used in its broadest sense to describe a state of unresponsiveness to a drug that is accomplished by repeated and increasing exposure to that agent (4­8). Similar to acute desensitization for IgE-mediated reactions, these patients have had undeniable reactions to these drugs in the past. During desensitization, the positive immediate skin test reactions temporarily convert to negative during the administration of the incriminated medication. The broader term induction of drug tolerance has been recommended instead of 762 desensitization in the 2010 Drug Allergy practice parameters in the United States so that it applies to immunologic-IgE mediated, immunologic-non-IgE mediated, pharmacologic, and processes of unknown mechanism (4). An international consensus in 2014 suggested using drug provocation test(s) (5) also known as test dosing or graded drug challenge (6). For billing purposes, the only term with a current procedural terminology code is desensitization. Unlike true desensitization to IgEmediated reactions, these protocols are often more cumbersome and may require hours or days to complete (13). Finally, one should be reminded that induction of drug tolerance (4) or drug provocation tests (6) and true desensitizations are potentially hazardous procedures best left to physicians experienced in managing hypersensitivity reactions (4­6). Highly trained nurses or other health care professionals can participate in the monitoring of patients during challenges. Provocation drug tests providers should reassure the patient, physician, or dentist that this agent can be given safely. Alternatively, when the drug provocation testing results in symptoms such as instantaneous throat closure without objective findings, it helps to confirm the level of anxiety involved without demonstrating true allergy. The principle of drug provocation testing (graded drug challenges) is to select a dose of the drug below that which would potentially cause a serious reaction, and then proceed with increasingly larger incremental doses to full therapeutic doses. Using this technique, one can determine whether a reaction has occurred before proceeding to the next dose. When the suspected reaction was immediate, a 20- to 30-minute interval between doses is appropriate, and the procedure is usually completed in 3 to 5 hours or less. For late-onset reactions, such as a nonblistering or nonexfoliating dermatitis, the dosing interval may be as long as 24 to 48 hours, with the same protocols requiring 1 to 2 weeks or longer. Although there is always the possibility of a severe anaphylactic reaction, the risk of provocation test dosing appears to be very low. Nevertheless, incremental provocation testing of patients with a history of a bullous reaction to a medication or a serum sickness reaction (severe urticaria and arthralgia) (24) would have to be considered in rare patients (13,21). Penicillins and Other a-Lactam Antibiotics Background -Lactam antibiotic hypersensitivity deserves special consideration because of its medical importance. Penicillin has been studied extensively and has become a prototype for the study of allergic drug reactions. In one study of 1,893 consecutive adult patients who had an order written for an antimicrobial agent while hospitalized, 470 patients (25%) reported an allergy to at least one drug (25). A manual review of the charts revealed that just 32% of records specified the details of the allergic reaction. Similarly, from 453 inpatients on a medical service, 160 patients has antibiotic allergy listed, including 55 for simple penicillins, 8 for aminopenicillins, and 9 for antistaphylococcal penicillins (26). Some patients have been labeled falsely as penicillin allergic and are denied this useful, remarkably nontoxic agent. The reasons for this discrepancy are either a previously incorrect diagnosis or the frequently evanescent nature of penicillin allergy. Following an acute allergic reaction, there is a time-dependent decline in the rate of positive skin tests to penicillin. In the first year, 90% to 100% retain sensitivity after a convincing allergic reaction, but that percentage drops to about 30% at 10 years (27). For example, if confirmed by skin testing with major and minor determinants, current penicillin allergy is present in only 18% of subjects who claim to have penicillin allergy (28). This finding means that about one in five patients with any history of penicillin allergy is currently allergic to penicillin. Some patients, however, maintain the penicillinspecific IgE antibody for 30 to 40 years. It is, therefore, highly desirable to predict which patients are at risk for a penicillin reaction. It is important to recognize that penicillin-allergic patients, who have current penicillin sensitization by skin testing, may not have an "impressive" history of anaphylactic shock, urticaria, angioedema, acute wheezing, and so on.

Short-term prednisone has limited side effects mood disorder vs personality disorder clomipramine 10 mg overnight delivery, and is often useful for control of severe acute urticaria not responding to antihistamines depression rating scale buy clomipramine 25 mg line. The choice of agents and the route of administration of drugs are dependent on the clinical situation depression severe joint pain cheap clomipramine online. A brief burst of corticosteroids and prolonged observation may be judicious mood disorders symptoms purchase clomipramine line, and is essential if there have been associated signs of anaphylaxis mood disorder bipolar 1 order discount clomipramine on line. The combination of cetirizine 10 mg every morning and hydroxyzine 25 mg at bedtime is quite useful. Leukotriene modifiers, oral albuterol, or doxepin antagonist may be prescribed with the initial antihistamine. Failure to respond in a few days to this therapy may indicate the need for a short course of prednisone. Many patients respond to this therapy, but the antihistamines should be continued for a period after the prednisone is stopped. The patient with a history of chronic urticaria presents a more complicated therapeutic problem. Following evaluation for an etiology, therapy is usually initiated in the stepwise manner described above and in Table 31. Failure to respond suggests that moderatedose prednisone should be initiated if the symptoms are sufficiently severe. Every effort to use alternate-day therapy should be made, but this is often initially inadequate. For those patients who are unable to discontinue corticosteroid therapy, use of a steroid-sparing agent should be considered. In March 2014, the Food and Drug Administration approved the use of omalizumab at doses of 150 or 300 mg subcutaneously every 4 weeks for patients with chronic urticaria not controlled by H1 antihistamines. The majority of patients have a rapid response to omalizumab, with improvement within 1 week of their first dose, whereas others average a time to response of 12 weeks (124­126). The ideal duration of therapy has yet to be determined such that once control is achieved, the dosing frequency should be adjusted on an individual basis taking into consideration the severity and duration of chronic urticaria as well as response to therapy. Other anti-inflammatory medications have been reported in small studies or case reports to be useful in refractory patients (130). Hydroxychloroquine (131), dapsone (132), colchicines (133), and other immunomodulatory drugs, including methotrexate (134), tacrolimus (135), and mycophenolate mofetil (136), have been used experimentally for chronic urticaria. Patients with urticaria can be very uncomfortable, have difficulty sleeping, and sometimes avoid social/work situations because of cosmetic appearance. Aggressive and consistent therapy for at least several months provides relief in many cases. Every effort should be made to find the best regimen with the least amount of side effects to control their symptoms. In summary, urticaria may be unpleasant, frustrating, and frightening to a patient. Often, these patients seek help from various physicians for an allergen that does not exist. At times, they undergo expensive, inappropriate tests, and 1499 treatments that are of no value and perhaps dangerous. Although the duration of chronic idiopathic/spontaneous urticarial is highly variable, tailored treatment will most often induce remission. Clinical and laboratory parameters in predicting chronic urticaria duration: a prospective study of 139 patients. The natural history of chronic urticaria and angioedema in patients visiting a tertiary referral centre. The prevalence inducible urticaria in patients with chronic spontaneous urticaria: associated risk factors. Activation of the tissue factor pathway of blood coagulation in patients with chronic urticaria. Skin responses to intradermal histamine and leukotrienes C4, D4, and E4 in patients with chronic idiopathic urticaria and in normal subjects. Detection of low-molecular-weight mast cell-activating factors in serum from patients with chronic spontaneous urticaria. Syndrome of idiopathic chronic urticaria and angioedema with thyroid autoimmunity: a study of 90 patients. The autologous serum skin test: a screening test for autoantibodies in chronic idiopathic urticaria. Effects of complement inactivation and IgG depletion on skin reactivity to autologous serum in chronic idiopathic urticaria. Blood basophil numbers in chronic ordinary urticaria and healthy controls: diurnal variation, influence of loratadine and prednisolone and relationship to disease activity. Altered expression of chemoattractant receptor-homologous molecule expressed on T(H)2 cells on blood basophils and eosinophils in patients with chronic spontaneous urticaria. Chronic idiopathic urticaria: infiltrating cells and related cytokines in autologous serum-induced wheals. Kinin formation in hereditary angioedema plasma: evidence against kinin derivation from C2 and in support of "spontaneous" formation of bradykinin. A case of progesteroneinduced anaphylaxis, cyclic urticaria/angioedema, and autoimmune dermatitis. Dermatologic adverse reactions to 7 common food additives in patients with allergic diseases: a double-blind, placebo-controlled study. Multicenter, double-blind, placebocontrolled, multiple-challenge evaluation of reported reactions to monosodium glutamate. Aspartame is no more likely than placebo to cause urticaria/angioedema: results of a multicenter, randomized, double-blind, placebo-controlled, crossover study. Neutrophilic urticaria: clinical features, histological changes and possible mechanisms. Symptomatic dermographism (factitious urticaria)-passive transfer experiments from human to monkey. Efficacy of montelukast, in combination with loratadine, in the treatment of delayed pressure urticaria. Delayed pressure urticaria: response to treatment with sulfasalazine in a case series of seventeen patients. Delayed pressure urticaria treated with the selective serotonin reuptake inhibitor escitalopram. Successful treatment of occupational delayed pressure urticaria and angioedema with omalizumab. Clinical features and natural history of acquired cold urticaria in a tertiary referral hospital: a 10year prospective study. Clinical characteristics of cold-induced systemic reactions in acquired cold urticaria syndromes: recommendations for prevention of this complication and a proposal for a diagnostic classification of cold urticaria. Kappa chain cold precipitable immunoglobulin G (IgG) associated with cold urticaria. Activation of complement by a monoclonal cryoglobulin associated with cold urticaria. High-dose desloratadine decreases wheal volume and improves cold provocation thresholds compared with standard-dose treatment in patients with acquired cold urticaria: a randomized, placebo-controlled, crossover study. Classification, diagnosis, and approach to treatment for angioedema: consensus report from the Hereditary Angioedema International Working Group. Characterization of anaphylaxis after ecallantide treatment of hereditary angioedema attacks. Long-term treatment of hereditary angioedema with attenuated androgens: a survey of a 13-year experience. A review of the reported defects in the human C1 esterase inhibitor gene producing hereditary angioedema including four new mutations. Acquired angioedema: autoantibody associations and C1q utility as a diagnostic tool. Acquired deficiency of the 1507 inhibitor of the first complement component: presentation, diagnosis, course, and conventional management. Omapatrilat and enalapril in patients with hypertension: the Omapatrilat Cardiovascular Treatment vs. Investigation of angioedema associated with the use of angiotensin-converting enzyme inhibitors and angiotensin receptor blockers. What the first 10,000 patients with chronic urticaria have taught me: a personal journey. Association between Helicobacter pylori infection and chronic urticaria: a meta-analysis. Immediate contact skin reactions, an update of contact urticaria, contact urticaria syndrome and protein contact dermatitis-"a never ending story. Laboratory tests and identified diagnoses in patients with physical and chronic urticaria and angioedema: a systematic review. In vitro pharmacology of clinically used central nervous system-active drugs as inverse H(1) receptor agonists. A review of its pharmacological properties and clinical potential in allergic rhinitis, polleninduced asthma, and chronic urticaria. Levocetirizine: the latest treatment option for allergic rhinitis and chronic idiopathic urticaria. Desloratadine for chronic idiopathic urticaria: a review of 1509 clinical efficacy. Prevention of mast-cell degranulation by ketotifen in patients with physical urticarias. Double-blind crossover study comparing doxepin with diphenhydramine for the treatment of chronic urticaria. The effectiveness of levocetirizine and desloratadine in up to 4 times conventional doses in difficult-to-treat urticaria. The leukotriene receptor antagonist montelukast in the treatment of chronic idiopathic urticaria: a single-blind, placebo-controlled, crossover clinical study. Omalizumab in patients with symptomatic chronic idiopathic/spontaneous urticaria despite standard combination therapy. Timing and duration of omalizumab response in patients with chronic idiopathic/spontaneous urticaria. Mechanisms of action that contribute to efficacy of omalizumab in chonic spontaneous urticaria. Low-dose and short-term 1510 cyclosporine treatment in patients with chronic idiopathic urticaria: a clinical and immunological evaluation. The comparative safety of multiple alternative agents in refractory chronic urticaria patients. Impact of hydroxychloroquine therapy on chronic urticaria: chronic autoimmune urticaria study and evaluation. Double-blind placebo-controlled trial of dapsone in antihistamine refractory chronic idiopathic urticaria. Tacrolimus in the treatment of severe chronic idiopathic urticaria: an open-label prospective study. Treatment of severe chronic idiopathic urticaria with oral mycophenolate mofetil in patients not responding to antihistamines and/or corticosteroids. Chronic sulfasalazine therapy in the treatment of delayed pressure urticaria and angioedema. Successful treatment of recalcitrant chronic idiopathic urticaria with sulfasalazine. The suffix "itus" is not to be confused with the Greek-derived "itis," meaning "inflammation of. When it is symptomatic of a visible skin problem, the etiology may be discerned from physical examination or biopsy. Pruritus in the absence of cutaneous findings, however, is a diagnostic challenge, and effective therapy may be elusive. This article begins with an overview of pruritus and then discusses the investigation and management of itching in the absence of skin disease. Generally, itching is described as "cutaneous" (due to skin disease) or "essential" (lacking skin findings). It may also be distinguished based on source: dermatologic or pruritoceptive (originating in the skin due to localized irritation), systemic (arising from pathology in internal organs), neurogenic/neuropathic (due to diseases of the central or peripheral nervous system), and psychogenic (due to psychiatric disease). In 2007, the International Forum for the Study of Itch formed a clinically based classification of pruritic diseases (1): 1. It is important to note, however, that the presence of skin findings does not exclude an underlying systemic cause, and the absence of skin eruption does not equate with systemic disease. The triggering sensation is transmitted by a functionally distinct subset of afferent, unmyelinated C-fibers (2). Different receptors may be responsible for itching resulting from electrical stimuli or friction. After reaching dorsal horn neurons in the spinal cord, the stimulus travels to the thalamus and cerebral cortex, producing the itch sensation and, through activation of the motor cortex, the desire to scratch. In cases without visible skin findings, temporal associations, environmental factors, and systemic symptoms can be important diagnostic clues. No particular clinical characteristic helps define the probability of an underlying disease, but some prediction can be made from the summation of features. Sometimes, multiple office visits and review of patient self-kept journals are necessary. Abrupt onset of severe itching is uncommon for systemic disease, which usually presents insidiously. Systemic diseases often produce generalized, symmetric itching, whereas a localized distribution suggests a neuropathic etiology, such as brachioradial pruritus (5) or notalgia paresthetica. Prior to direct questioning, the patient may not realize that itching occurs at specific times of day or is related to particular activities, such as bathing or exercise.

The cromones do not inhibit bronchospasm induced by histamine or methacholine (18­20) anxiety webmd purchase clomipramine 75 mg. Efficacy Cromones are an alternative initial therapy for mild persistent asthma (1 depression era clomipramine 10 mg buy low cost,2) depression symptoms quiz clomipramine 10 mg order visa. Their excellent safety profile may be very appealing to parents or patients who are concerned about side effects of inhaled corticosteroids depression definition illness purchase clomipramine online now. Both cromolyn and nedocromil have been reported to improve clinical outcomes and lung function when started early in the course of therapy (17) anxiety treatment natural generic 25 mg clomipramine amex. Cromones are less efficacious than corticosteroids in the treatment of asthma (18) and have a very limited role in the long-term treatment of asthma (1,2). Safety and Drug Interactions Cromolyn and nedocromil have no known drug interactions, toxicity, or 1629 clinically significant adverse effects. Dosing and Preparations Cromolyn is available in 20 mg/mL ampoules for nebulization to be administered four times daily, or 10 to 60 minutes prior to allergen exposure for ages 2 years and older. Cromolyn is available as a 100-mg ampoule to be taken orally for gastrointestinal symptoms of systemic mastocytosis for infants, children, and adults; the recommended dosage for mastocytosis is discussed elsewhere in this book. Cromolyn is available as a nasal spray for ages 2 years and older to be used as one spray in each nostril three to six times a day. Cromolyn is available as a 4% ophthalmic preparation to be used four to six times a day for allergic conjunctivitis, giant papillary conjunctivitis, vernal keratitis, and vernal keratoconjunctivitis. Nedocromil is available as a 2% ophthalmic preparation approved to be used twice a day for allergic conjunctivitis. The antileukotrienes available in the United States are montelukast, zileuton, and zafirlukast. Leukotriene Formation and Biologic Activity of the Leukotrienes the leukotrienes are formed from arachidonic acid. The cysteinyl leukotrienes are potent mediators of bronchoconstriction, airway hyperresponsiveness, microvascular permeability, and mucus secretion. The leukotrienes are important mediators of aspirin-exacerbated respiratory disease. Aspirin-sensitive asthmatics have increased baseline levels of leukotrienes compared with nonaspirin-sensitive asthmatics, and develop markedly enhanced levels of leukotrienes in their lungs, nasal secretions, and urine following aspirin challenge (22). The antileukotrienes have been shown to inhibit influx of eosinophils into the airways and reduce blood eosinophil levels (22­24). Montelukast and zafirlukast inhibit both the early- and late-phase response to allergen (25,26). The antileukotrienes have demonstrated protective effects against exercise-induced bronchoconstriction (28). Zafirlukast and zileuton inhibit bronchoconstriction induced by cold dry air (29,30). Zileuton and montelukast have been shown to inhibit aspirin-induced bronchospasm in aspirin-exacerbated asthma (32). Efficacy the antileukotrienes result in fewer asthma symptoms and exacerbations, decreased use of rescue inhalers and oral corticosteroids compared to placebo. They are less efficacious than inhaled corticosteroids (21,32,33), but may be suitable as monotherapy for selected patients or as add-on therapy to inhaled corticosteroids (1,2). Antileukotrienes may result in improved asthma control as additional therapy in patients not adequately controlled by inhaled corticosteroids. Most of the data from randomized trials show that long-acting agonists are superior to antileukotrienes as add-on therapy to inhaled corticosteroids for asthma (34). Montelukast and zafirlukast have been shown to be similar in efficacy and 1631 tolerability to antihistamines for allergic rhinitis (35,36). Fluticasone propionate has been shown to be superior to montelukast for the treatment of allergic rhinitis (37). Safety and Drug Interactions the antileukotrienes are generally safe and well tolerated. Zileuton can cause hepatotoxicity as well as elevated transaminases, hepatitis, and death from liver disease. Montelukast and zafirlukast do not have known hepatotoxicity at recommended doses. Zileuton and zafirlukast may prolong the international normalized ratio in patients taking warfarin. Zileuton significantly inhibits the hepatic metabolism of theophylline, and may result in theophylline toxicity; zafirlukast may also increase theophylline serum levels. Zileuton has many drug interactions, and caution is advised when prescribing it along with other drugs that are metabolized by the liver (38,41). Dosage and Preparation Zileuton is approved for individual aged 12 years and older and is available as a 600-mg tablet to be taken four times daily, or a 600-mg sustained-release tablet to be taken as two tablets twice daily with food. Zafirlukast is approved for ages 5 years and older; it is available in 10 mg tablets for ages 5 to 11 and 20 mg tablets for ages 12 and older to be taken every 12 hours. Montelukast is available as 4 mg granules for ages 6 months to 5 years, 4 and 5 mg chewable tablets for ages 2 to 6 and ages 6 to 15 years, respectively, and 10 mg tablets for ages 15 years and older. Montelukast is administered once a day, in the evening or 2 1632 hours prior to exercise. Zileuton is approved for ages 12 years and older; it is available as 600 mg tablets to be taken 1, four times daily or as a 600-mg sustained-release tablet to be taken 2 twice daily. The toxicity of atropine gave rise to the mnemonic: red as a beet; hot as a hare; dry as a bone; blind as a bat; and mad as a hatter. The useful properties of atropine led to the development of inhaled anticholinergics with minimal systemic absorption and side effects. Ipratropium was the first anticholinergic to be approved by the Food and Drug Administration for relief of acute asthma symptoms and is also available as a nasal spray. Cholinergic Mechanisms in the Airways the vagus nerve supplies autonomic innervation to the large- and medium-sized airways. Release of acetylcholine from the parasympathetic postganglionic fibers acting on muscarinic receptors, results in smooth muscle contraction and release of secretions from submucosal glands. The activity of cholinergic fibers results in a constant low level of tonic activity of the airways. A variety of stimuli, including irritants, exercise, cold dry air, histamine, and allergens, can trigger irritant receptors of vagal afferent nerves, resulting in almost immediate reflex bronchoconstriction and mucus hypersecretion (42). Mechanism of Action of Anticholinergics the anticholinergic agents compete with acetylcholine at muscarinic receptors. Because muscarinic receptors are found primarily in the central airways, anticholinergic bronchodilatation occurs mostly in the larger airways. The anticholinergics provide virtually complete protection against bronchoconstriction by methacholine. Anticholinergics provide varied protection against bronchoconstriction induced by other stimuli, including histamine, irritants, exercise, and allergens (43). Pharmacology Atropine is well absorbed from mucosal surfaces and reaches peak serum levels within 1 hour. Atropine relaxes 1633 smooth muscle in the airway, gastrointestinal tract, iris, and peripheral vasculature. Atropine crosses the blood­brain barrier and can cause significant central nervous system side effects (44). The quaternary structure allows for poor absorption across respiratory and other membranes and results in fewer systemic side effects than atropine. Ipratropium starts to work within 15 to 30 minutes after inhalation, but maximum bronchodilatation may not result until 90 minutes; effects last up to 6 hours (45). Tiotropium has a peak onset of dilatation within 1 to 3 hours and effects last for more than 24 hours (46). Efficacy Anticholinergics are less effective bronchodilators and have a much slower onset of action than albuterol which has its peak effect within 5 to 15 minutes (46). Current guidelines do not recommend anticholinergic medications as standalone treatment for asthma (1,2). Ipratropium may be useful as a bronchodilator in patients who are intolerant to short-acting agonists (47). Tiotropium has been shown to improve symptoms and lung function when used as add-on therapy in patients with difficult to control asthma (48,49). Ipratropium has been shown to reduce hospital admissions when added to short-acting agonists in the acute treatment of asthma exacerbations (47). Ipratropium is recommended for the treatment of bronchospasm caused by blockers (1). Ipratropium bromide nasal spray relieves rhinorrhea associated with allergic or nonallergic rhinitis (50,51) as well as rhinorrhea caused by viral upper respiratory infections (52). Safety and Drug Interactions Atropine causes significant side effects, even at therapeutic doses. Dry mouth, warmth and flushing of the skin, impairment of mucociliary clearance, gastroesophageal reflux, and urinary retention are common. Central nervous system effects ranging from irritability to hallucinations, and coma may occur. Tachyarrhythmias may occur at low doses, and atrioventricular association may occur at high doses. Ipratropium bromide is very well tolerated and has little toxicity because it is so poorly adsorbed. Rare cases of blurred vision, papillary dilatation, and angleclosure glaucoma have been reported when the drug has had direct contact with the eye. Tiotropium is also generally safe and well tolerated, but because its half-life is long, ocular and urinary side effects may occur. There is a concern that the mist formulation of tiotropium, but not the dry powder formulation, may be associated with increased mortality (46,53), but a recent large multicenter trial comparing the two devices failed to demonstrate increased deaths in patients using the mist device (54). Dosage and Preparation Ipratropium is available as a metered-dose inhaler to be used up to four times a day. Emphasis on the treatment of inflammation in asthma as well as the development of drugs with similar or superior safety and efficacy and 1635 improved safety and tolerability has led to a decline in the use of theophylline (55). Pharmacology Theophylline is a methylxanthine, similar in to the naturally occurring xanthenes caffeine and theobromine. The solubility of methylxanthines is low unless they form salts or complexes with other compounds such as ethylenediamine (as in aminophylline). Theophylline is rapidly absorbed after oral or rectal administration and maximum serum levels occur 2 hours after ingestion on an empty stomach. The elimination rate of theophylline varies widely among individuals depending on age, genetic and environmental factors as well as underlying disease. It is metabolized by the cytochrome P450 system of the liver, and serum levels are altered by many medications, which are discussed in detail later in this chapter. High-protein, low-carbohydrate diets and diets high in charcoal-grilled foods as well as smoking tobacco and marijuana increase theophylline clearance and may decrease theophylline levels. Mechanism of Action the mechanism of action of theophylline is not clearly understood. Theophylline inhibits cyclic adenosine monophosphate­specific phosphodiesterases at high concentrations, but this effect is negligible at therapeutic doses (55). Antagonism of adenosine receptors has also been proposed as mechanism of action of theophylline, and may account for its severe adverse effects, including seizures and arrhythmias. Theophylline activates histone deacetylases, an effect that is most pronounced when their activity is reduced by oxidative stress. The clinical effects of theophylline are relaxation of smooth muscle in airways, increased respiratory drive, decreased fatigue of respiratory muscles, increased mucociliary clearance, and decreased microvascular leakage into airways (55). Efficacy Theophylline is similar in efficacy but less well tolerated than long-acting inhaled agonists for the treatment of asthma (60). Comparison studies of theophylline with the long-acting agonists, formoterol and salmeterol, showed that theophylline provided similar improvement in forced expiratory volume in 1 second, but less improvement in morning and evening peal flow rates and use of rescue inhalers. There were also more adverse events associated with use of theophylline than with use of formoterol or salmeterol (60). A study comparing the leukotriene antagonist zileuton with theophylline found that zileuton was as effective as theophylline and had fewer side effects (61). Theophylline may be an option for asthmatic smokers who do not respond well to inhaled corticosteroids (55). Safety and Drug Interactions Theophylline is a drug with very narrow margin of safety. Serum concentrations should be monitored and maintained between 5 and 15 µg/mL; many patients will obtain clinical benefit at serum levels in the low therapeutic range (46). In a 10-year prospective study of the Massachusetts Poison Control Center, there were 356 cases in which the theophylline level was greater than 30 µg/mL. Other toxic effects of theophylline include hypokalemia, hyperglycemia, encephalopathy, hyperthermia, and hypotension (55). Theophylline has also unpleasant side effects that many patients find intolerable. Headache, irritability, nausea, and insomnia may occur even when serum levels are within the therapeutic range. Drugs that significantly elevate theophylline levels include clarithromycin, erythromycin, most of the quinolone antibiotics, cimetidine, disulfiram, estrogen, fluvoxamine, interferon-, pentoxifylline, propafenone, propranolol, tacrine, ticlopidine, thiabendazole, verapamil, and zileuton. Theophylline may decrease the effects of adenosine, diazepam, flurazepam, lithium, and pancuronium. Carbamazepine, phenobarbital, phenytoin, rifampin, and sulfinpyrazone may decrease theophylline levels (55,56). It is also available as uncoated tablets, encapsulated sprinkles, in suspension, and as a rectal suppository. For children older than 6 months and adults, the starting dose should be 10 mg/kg up to a maximum initial dose of 300 mg/day. The dosage may be increased every 3 days, if tolerated, up to 16 mg/kg with a maximum dose of 600 mg/day. The peak serum level occurs 8 to 13 hours after the sustained-release preparations and should be 5 to 15 g/mL. Dosage requirements generally maintain stable, but concomitant medications and acute or chronic illness may alter serum levels (55).

Innate immune responses to rhinovirus are reduced by the high-affinity IgE receptor in allergic asthmatic children depression symptoms heart pain cheap clomipramine 10 mg buy. Preseasonal treatment with either omalizumab or an inhaled corticosteroid boost to prevent fall asthma exacerbations volcanic depression definition buy clomipramine us. Infection with human rhinovirus 16 promotes enhanced IgE responsiveness in basophils of atopic asthmatics bipolar depression and relationships purchase generic clomipramine online. Meta-analysis of the heritability of human traits based on fifty years of twin studies depression fracture definition purchase clomipramine uk. The contribution of twin studies to the understanding of the aetiology of asthma and atopic diseases depression symptoms chart buy genuine clomipramine on-line. The pivotal role of 5lipoxygenase products in the reaction of aspirin-sensitive asthmatic subjects to aspirin. The effect of aspirin desensitization on urinary leukotriene E4 concentrations in aspirin-sensitive asthma. Overexpression of leukotriene C4 synthase in bronchial biopsies from patients with aspirin-intolerant asthma. Spatio-temporal ozone variation in a case-crossover analysis of childhood asthma hospital visits in New York City. Increased ultrafine particles and carbon monoxide concentrations are associated with asthma exacerbation among urban children. Post-traumatic stress disorder, bronchodilator response, and incident asthma in World Trade Center rescue and recovery workers. Association between adverse childhood experiences in the home and pediatric asthma. In utero exposure to 25-hydroxyvitamin D and risk of childhood asthma, wheeze, and respiratory tract infections: a meta-analysis of birth cohort studies. Family history of asthma and atopy: in-depth analyses of the impact of asthma and wheeze in 7- and 81029 year old children. No evidence for effects of family environment on asthma: a retrospective study of Norwegian twins. Pulmonary effects of maternal smoking on the fetus and child: effects on lung development, respiratory morbidities, and life long lung health. A randomized trial of air cleaners and a health coach to improve indoor air quality for inner-city children with asthma and secondhand smoke exposure. Early-life determinants of asthma from birth to age 20 years: a German birth cohort study. Amish children living in northern Indiana have a very low prevalence of allergic sensitization. Not all farming environments protect against the development of asthma and wheeze in children. The eosinophilic leukocyte and the pathology of fatal bronchial asthma: evidence for pathologic heterogeneity. Airway responsiveness to mannitol in asthma is associated with chymase-positive mast cells and eosinophilic airway inflammation. Association between neutrophilic airway inflammation and airflow limitation in adults with asthma. Markers of vascular perturbation correlate with airway structural change in asthma. A morphologic study of the airway structure abnormalities in patients with asthma by high-resolution computed tomography. Triggering the induction of myofibroblast and fibrogenesis by airway epithelial shedding. Functional characteristics of bronchial epithelium obtained by brushing from asthmatic and normal subjects. Apoptosis, proliferation, and expression of Bcl-2, Fas, and Fas ligand in bronchial biopsies from asthmatics. Airway hyperresponsiveness in asthma: mechanisms, clinical significance, and treatment. Associations between asthma history, atopy and non-specific bronchial responsiveness in young adults. Elevated levels of eosinophil granule major basic protein in the sputum of patients with bronchial 1032 asthma. Elevated substance P content in induced sputum from patients with asthma and patients with chronic bronchitis. Neurokinin A is the predominant tachykinin in human bronchoalveolar lavage fluid in normal and asthmatic subjects. Management of asthma based on exhaled nitric oxide in addition to guideline-based treatment for innercity adolescents and young adults: a randomized controlled trial. Increased 8-isoprostane, a marker of oxidative stress, in exhaled condensate of asthma patients. Relationship between exhaled leukotriene and 8-isoprostane levels and asthma severity, asthma control 1033 level, and asthma control test score. Pharmacogenetics of the 5lipoxygenase biosynthetic pathway and variable clinical response to montelukast. Corticosteroid-resistant asthma is associated with classical antimicrobial activation of airway macrophages. Theophylline in maintenance treatment of chronic asthma: concentration-dependent additional effect to beta 2-agonist therapy. Tiotropium improves lung function, exacerbation rate, and asthma control, independent of baseline characteristics including age, degree of airway obstruction, and allergic status. Impact of coping and socioeconomic factors on quality of life in adults with asthma. Coping and social problem solving correlates of asthma control and quality of life. An Official American Thoracic Society Workshop Report: evaluation and management of asthma in the elderly. Health service use by African Americans and Caucasians with asthma in a managed care setting. Quantitative structural analysis of peripheral airways and arteries in sudden fatal asthma. Airway epithelial orchestration of innate immune function in response to virus infection: a focus on asthma. Asthma phenotypes and the use of biologic medications in asthma and allergic disease: the next steps toward personalized care. Sudden-onset fatal asthma: a distinct clinical entity with few eosinophils and relatively more neutrophils in the airway submucosa Clinical, pathologic, and toxicologic findings in asthma deaths in Cook County, Illinois. Sputum neutrophil counts are associated with more severe asthma phenotypes using cluster analysis. Airway hyperresponsiveness in asthma: not just a problem of smooth muscle relaxation with inspiration. Differences and similarities between chronic obstructive pulmonary disease and asthma. Relationship between airway obstruction and respiratory symptoms in adult asthmatics. Systemic inflammation and higher perception of dyspnea mimicking asthma in obese subjects. Effects of age and disease severity on systemic corticosteroid responses in asthma. Dynamic hyperinflation during bronchoconstriction in asthma: implications for symptom perception. Airways distensibility in adults with asthma and healthy adults, measured by forced oscillation technique. Dyspnoea at rest and at the end of different exercises in patients with near-fatal asthma. Evidence that severe asthma can be divided pathologically into two inflammatory subtypes with distinct physiologic and clinical characteristics. Ventilation and perfusion lung scintigraphy of allergen-induced airway responses in atopic asthmatic subjects. Antidiuretic hormone in acute asthma in children: effects of medication on serum levels and clinical course. Progression of irreversible airflow limitation in asthma: correlation with severe exacerbations. The diagnosis of potentially fatal asthma in hospitalized adults: patient characteristics and increased severity of asthma. Malignant potentially fatal asthma: achievement of remission and the application of an asthma severity index. Assessment of corticosteroid response in pediatric patients with severe asthma by using a multidomain approach. A cohort analysis of excess mortality in asthma and the use of inhaled B-agonists. Outcome of asthma and wheezing in the first 6 years of life: follow-up through adolescence. Optimum predictors of childhood asthma: persistent wheeze or the Asthma Predictive Index Asthma endotypes: a new approach to classification of disease entities within the asthma syndrome. Changes in bone marrow inflammatory cell progenitors after inhaled allergen in asthmatic subjects. Allergen-induced changes in bone marrow and airway dendritic cells in subjects with asthma. An official American Thoracic Society workshop report: Evaluation and management of asthma in the elderly. Distribution, aerodynamic characteristics, and removal of the major cat allergen Fel d 1 in British homes. Effect of environmental molds on risk of death from asthma during the pollen season. Difficult-to-control asthma: epidemiology and its link with environmental factors. Mouse allergen is the major allergen of public health relevance in Baltimore City. Factors associated with asthma control in children: findings from a national Web-based survey. Will a nasal corticosteroid improve control for patients with step 3 or higher persistent asthma IgE reactivity, work related allergic symptoms, asthma severity, and quality of life in bakers with occupational asthma. Respiratory function and immunologic status in workers processing dried fruits and teas. Characteristics of early transient, persistent, and late onset wheezers at 9 to 11 years of age. Sibling, day-care attendance, and the risk of asthma and wheezing during childhood. The role of aspirin desensitization in the management of aspirin-exacerbated respiratory disease. Aspirin-exacerbated respiratory disease: mediators and mechanisms of a clinical disease. Prevalence of aspirinexacerbated respiratory disease among asthmatic patients: a meta-analysis of the literature. Localization and upregulation of cysteinyl leukotriene-1 receptor in asthmatic bronchial mucosa. Prostaglandin E2 receptors in asthma and in chronic rhinosinusitis/nasal polyps with and without 1042 aspirin hypersensitivity. Bronchial aspirin challenge causes specific eicosanoid response in aspirin-sensitive asthmatics. Occupational asthma and allergy in snow crab processing in Newfoundland and Labrador. Patterns of improvement in spirometry, bronchial hyperresponsiveness, and specific IgE antibody levels after cessation of exposure in occupational asthma caused by snowcrab processing. A clinical and immunologic study of workers with trimellitic-anhydride-induced immunologic lung disease after transfer to low exposure jobs. Abnormal vocal cord movement in patients with and without airway obstruction and asthma symptoms. Salmeterol and fluticasone propionate and survival in chronic obstructive pulmonary disease. Combined corticosteroid and longacting beta2-agonist in one inhaler versus placebo for chronic obstructive pulmonary disease. Predictors of repeat visits to the emergency room by asthmatic children in primary care. Cigarette smoking and ozone-associated emergency department use for asthma by adults in New York City. Combined nasal challenge with diesel exhaust particles and allergen induces in vivo IgE isotope switching. Childhood asthma acute primary care visits, traffic, and traffic-related pollutants.

Order clomipramine visa. Psychotherapist and counsellor Kym Winters at 9th NET patient support group meeting.

Anaphylaxis to ethylene oxide­sterilized devices has been described; hence depression jugendalter test purchase clomipramine 50 mg fast delivery, such devices used during anesthesia could potentially cause anaphylaxis (91) anxiety 24 order genuine clomipramine on-line. Anaphylactoid reactions may also be caused by blood and blood products through the activation of complement and the production of anaphylatoxins depression and symptoms generic clomipramine 50 mg free shipping. Adverse reactions to monoclonal antibodies include immediate generalized manifestations depression test for loved ones cheap clomipramine 10 mg buy, but the mechanism for such remains unclear (95) depression symptoms returning clomipramine 75 mg purchase with amex. Most appear not to be IgE mediated (96) and protocols including rapid desensitization have been established for managing these reactions (97,98). If one surveys the medical literature, one will find that virtually all drugs, including corticosteroids, tetracycline, cromolyn, erythromycin, and cimetidine, have been implicated in such immediate generalized reactions. However, these infrequent reports should not be a reason to withhold essential medication. Serum Sickness and Serum Sickness­Like Reactions Serum sickness results from the administration of heterologous (often equine) antisera and is the human equivalent of immune complex­mediated serum sickness observed in experimental animals (99). A serum sickness­like illness has been attributed to a number of nonprotein drugs, notably the -lactam antibiotics. These reactions are usually self-limited and the outcome favorable, but H1 blockers and prednisone may be needed. With effective immunization procedures, antimicrobial therapy, and the availability of human antitoxins, the incidence of serum sickness has declined. Currently, heterologous antisera are still used to counteract potent toxins such as snake venoms, black widow and brown recluse spider venom, botulism, and gas gangrene toxins as well as to treat diphtheria and rabies. Equine and rabbit antisera, used as antilymphocyte or antithymocyte globulins and as monoclonal antibodies for immunomodulation and cancer treatment, may cause serum sickness (100). Other drugs occasionally incriminated include ciprofloxacin, metronidazole, streptomycin, sulfonamides, allopurinol, carbamazepine, hydantoins, methimazole, phenylbutazone, propanolol, and thiouracil. It should be noted that the criteria for diagnosis might not be uniform for each drug. The onset of serum sickness typically begins 6 to 21 days after administration of the causative agent. Among previously immunized individuals, the reaction may begin within 2 to 4 days following administration of the inciting agent. The manifestations include fever and malaise, skin eruptions, joint symptoms, and lymphadenopathy. There is no laboratory finding specific for the diagnosis of serum sickness or serum sickness­like reactions. The erythrocyte sedimentation rate may be elevated, although it has been noted to be normal or low (102). There may be a transient leukopenia or leukocytosis during the acute phase (79,105). Plasmacytosis may occasionally be present; in fact, serum sickness is one of the few illnesses in which plasma cells may be seen in the peripheral blood (106). The urinalysis may reveal slight proteinuria, hyaline casts, hemoglobinuria, and microscopic hematuria. Serum concentrations of C3, C4, and total hemolytic complement are depressed, providing some evidence that an immune complex mechanism is operative. Immune complex and elevated plasma concentrations of C3a and C5a anaphylatoxins have been documented (107). The symptoms may be mild, lasting only a few days, or quite severe, persisting for several weeks or longer. However, corticosteroids do not prevent serum sickness, as noted in patients receiving antithymocyte globulin (100). Skin testing with foreign antisera is routinely performed to avoid anaphylaxis with future use of foreign serum. Fever may be the sole manifestation of drug hypersensitivity and is particularly perplexing in a clinical situation in which a patient is being treated for an infection. The height of the temperature does not distinguish drug fever, and there does not appear to be any fever pattern typical of this entity. Although a distinct disparity between the recorded febrile response and the relative well-being of the patient has been emphasized, clearly, such individuals may be quite ill with high fever and shaking chills. Drug fever may be the sole manifestation of a drug allergy but is commonly seen with other signs of drug hypersensitivity such as rash, elevated liver enzymes, and eosinophils. Laboratory studies usually reveal leukocytosis with a shift to the left, thus mimicking an infectious process. An elevated erythrocyte sedimentation rate and abnormal liver function tests are present in most cases. The most consistent feature of drug fever is prompt defervescence, usually within 48 to 72 hours after withdrawal of the offending agent. Subsequent readministration of the drug produces fever, and occasionally chills, within a matter of hours. In general, the diagnosis of drug fever is one of exclusion after eliminating other potential causes of the febrile reaction. If not appreciated, patients may be subjected to multiple diagnostic procedures and inappropriate treatment. Of greater concern is the possibility that the reaction may become more generalized with resultant tissue damage. Autopsies on patients who died during drug fever show arteritis and focal necrosis in many organs, such as the myocardium, lung, and liver. However, these same autoantibodies are found frequently in the absence of frank disease. An excellent review of drug-induced autoimmunity appears elsewhere (108) as well as a comprehensive review of the medications implicated (109). Other agents for which there has been definite proof of an association include isoniazid, chlorpromazine, methyldopa, quinidine, and minocycline. Another group of drugs probably associated with the syndrome includes many anticonvulsants, -blockers, antithyroid drugs, penicillamine, sulfasalazine, and lithium. Fever, malaise, arthralgias, myalgias, pleurisy, and slight weight loss may appear acutely in a patient receiving an implicated drug. Pleuropericardial manifestations, such as pleurisy, pleural effusions, pulmonary infiltrates, pericarditis, and pericardial effusions, are more often seen in patients taking procainamide. Clinical symptoms usually do not appear for many months after institution of drug treatment. In an occasional patient, the symptoms may persist or recur over several months before disappearing. If no satisfactory alternative drug is available and treatment is essential, the minimum effective dose of the drug and corticosteroids may be given simultaneously with caution and careful observation. In fact, remission of procainamideinduced lupus has occurred when patients were switched to Nacetylprocainamide therapy (125,126). It has been suggested that by binding to cell membranes as a hapten, penicillamine could induce an autologous T-cell reaction, B-cell proliferation, autoantibodies, and autoimmune disorders (129). Hypersensitivity Vasculitis Vasculitis is a condition that is characterized by inflammation and necrosis of blood vessels. Also, drugs do not appear to be implicated in the systemic necrotizing and granulomatous vasculitic syndromes. These may occur at any age, but the average age of onset is in the fifth decade (131). The older patient is more likely to be taking medications that have been associated with this syndrome, for example, diuretics and cardiac drugs. Other frequently implicated agents include penicillin, 693 sulfonamides, thiouracils, hydantoins, iodides, and allopurinol. Allopurinol administration, particularly in association with renal compromise and concomitant thiazide therapy, has produced a vasculitic syndrome manifested by fever, malaise, rash, hepatocellular injury, renal failure, leukocytosis, and eosinophilia. The lesions occur in recurrent crops of varying size and number and are usually distributed in a symmetric pattern on the lower extremities and sacral area. Fever, malaise, myalgia, and anorexia may accompany the appearance of skin lesions. This inflammation involves small blood vessels, predominantly postcapillary venules. When a patient presents with palpable purpura and has started a drug within the previous few months, consideration should be given to stopping that agent. For a minority of patients who have persistent lesions or significant involvement of other organ systems, corticosteroids are indicated. The offending drug could be identified in most cases, and in one study was confirmed by drug challenges in 694 62% of patients (135). Most are of mild or moderate severity, often fade within a few days, and pose no threat to life or subsequent health. These reactions, although rare, are responsible for significant morbidity and mortality. Features that suggest that a reaction is serious include the presence of urticaria, blisters, mucosal involvement, facial edema, ulcerations, palpable purpura, fever, lymphadenopathy, and eosinophilia (137). The presence of these usually necessitates prompt withdrawal of the offending drug. Exanthematous or Morbilliform Eruptions Exanthematous or morbilliform eruptions are the most common drug-induced eruptions and may be difficult to distinguish from viral exanthems. The rash may be predominantly erythematous, maculopapular, or morbilliform (measles-like), and often begins on the trunk or in areas of pressure, for example, the backs of bedridden patients. Occasionally, pruritus may be an early symptom, preceding the development of cutaneous manifestations. Gold salts and sulfonamides have been associated with pruritus as an isolated feature. Usually, this drug-induced eruption appears within a week or so after institution of treatment. It has a relatively later onset (2 to 6 weeks after initiation of treatment), evolves slowly, and may be difficult to distinguish from drug-induced vasculitis. Urticaria and Angioedema Urticaria with or without angioedema is the second most frequent drug-induced eruption. It may occur alone or may be part of an immediate generalized reaction, such as anaphylaxis, or serum sickness. An allergic IgE-mediated 696 mechanism is often suspected, but it may be the result of a pseudoallergic reaction. Often, urticaria appears shortly after drug therapy is initiated, but its appearance may be delayed for days to weeks. Usually, individual urticarial lesions do not persist much longer than 24 hours, but new lesions may continue to appear in different areas of the body for 1 to 2 weeks. If the individual lesions last longer than 24 hours, or if the rash persists for much longer than 2 weeks, the possibility of another diagnosis such as urticarial vasculitis should be considered. A drug etiology should be considered in any patient with chronic urticaria, which is defined as lasting more than 6 weeks. The angioedema commonly involves the face and oropharyngeal tissues and may result in acute airway obstruction necessitating emergency intervention. Most episodes occur within the first week or so of therapy, but there are occasional reports of angioedema occurring years after initiation of treatment (146). Because treatment with epinephrine, antihistamines, and corticosteroids may be ineffective, the physician must be aware of the potential for airway compromise and the possible need for early airway intervention measures and treatment with icatibant (148). Angioedema has been reported with these, although the incidence is much lower (149). Following topical sensitization, the contact dermatitis may be elicited by subsequent topical application. The appearance of the skin reaction and diagnosis by patch testing is similar to allergic contact dermatitis from other causes. The diagnosis should be suspected when the condition for which the topical preparation is being applied, such as eczema, fails to improve or worsens. Patients at increased risk of allergic contact dermatitis include those with stasis dermatitis, leg ulcers, perianal dermatitis, and hand eczema (150). Less common sensitizers include paraben esters, thimerosal, antihistamines, bacitracin, and, rarely, sunscreens and topical corticosteroids (151). Neomycin is the most widely used topical antibiotic and has become the most sensitizing of all antibacterial preparations. Neomycin-allergic patients may develop a systemic "contact-type" dermatitis when exposed to some of these drugs systemically. In addition to neomycin, other topical antibiotics that are frequent sensitizers include penicillin, sulfonamides, chloramphenicol, and hydroxyquinolones. It is found in many nonprescription preparations, such as sunburn and poison ivy remedies, topical analgesics, throat lozenges, and hemorrhoid preparations. Suitable alternatives are the local anesthetics based on an amide structure, such as lidocaine, mepivacaine, and bupivacaine. Ethylenediamine, a stabilizer used in some antibiotics, corticosteroids, and nystatin-containing combination creams, is a common sensitizer. Once sensitized to ethylenediamine topically, a patient may experience widespread dermatitis following the systemic administration of medicaments that contain ethylenediamine, such as aminophylline, hydroxyzine, and tripelennamine (153); 698 however, this is not common. Among the less frequent topical sensitizers, paraben esters, used as preservatives in topical corticosteroid creams, were thought to be important; however, a recent study failed to support this assertion (154). Not all such patients are mercury allergic; many react to the thiosalicylic moiety. Local and even systemic reactions have been ascribed to thimerosal used as a preservative in some vaccines (155). Systemic administration of antihistamines is rarely, if ever, associated with an allergic reaction; however, topical antihistamines are potential sensitizers, and their use should be avoided. Most instances of allergic contact dermatitis attributed to topical corticosteroids are due to the vehicle, not to the steroid itself. Patch testing with the highest concentration of the steroid ointment may help identify whether the steroid itself or the vehicle constituent is responsible. Some attention has already been focused on systemic eczematous contact-type dermatitis.

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