Original article
Postprandial exercise-induced anaphylaxis

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Abstract

A variety of systemic reactions associated with exercise are increasingly being recognized. We studied an atopic individual whose job-related activities involved strenuous running that often terminated in an episode of syncope and hypotension preceded by cutaneous pruritus, warmth, urticaria, and angioedema. These attacks occurred only after meals, but no foods appeared to elicit symptoms without subsequent exercise. The subject underwent three exercise challenges in the laboratory under the following conditions: (1) fasting state, with heat-dissipating clothing, (2) fasting, with heat-retention clothes, and (3) after a meal. Blood pressure decreases and minimum skin reactivity were observed for (1) and (2), and reproduction of syncope, hypotension, and further cutaneous manifestation were observed only after (3). Venous and arterial plasma determinations for complement activation (C4, C4d, and CH50) and histamine before, during, and after exercise were not abnormal. Although other vasodepressor mediators may have been liberated, at least part of the mechanism for postprandial exercise-related syncope may be attributed to a shift of blood flow to the splanchnic as well as skeletal muscle vasculature.

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    Dr. Fairshter is recipient National Heart, Lung and Blood Institute Pulmonary Academic Award 00529-01A2.

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