Asthma

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Use of b adrenergic agonists in the treatment of asthma is discussed in Chapter 27. ALLERGIC REACTIONS

Epi is the drug of choice to reverse the manifestations of serious acute hypersensitivity reactions (e.g., from food, bee sting, or drug allergy). A subcutaneous injection of Epi rapidly relieves itching, hives, and swelling of lips, eyelids, and tongue. In some patients, careful intravenous infusion of Epi may be required to ensure prompt pharmacological effects. This treatment may be life saving when edema of the glottis threatens airway patency or when there is hypotension or shock in patients with anaphylaxis. In addition to its cardiovascular effects, Epi activates b receptors that suppress the release from mast cells of mediators such as histamine and leukotrienes. Although glucocorticoids and antihistamines frequently are administered to patients with severe hypersensitivity reactions, Epi remains the mainstay.

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