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Previous Volume 321:1069-1073 October 19, 1989 Number 16 Next

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Abstract

The movement of ions and water across the membranes of bronchial cells is part of the control of the bronchial obstructive response to physical stimuli. In a double-blind, randomized, crossover study, we compared the effect of an aerosol of the loop diuretic furosemide with that of a placebo on the early (within 60 minutes) and late (4 to 12 hours) asthmatic responses to a specific inhaled allergen. We studied 11 subjects with mild allergic asthma, who had both early and late asthmatic responses to a specific inhaled allergen in a preliminary challenge. After placebo administration, the maximal changes (mean +/- SE) from base line in the forced expiratory volume in one second (FEV1) and specific airway resistance were, respectively, a decrease of 35 +/- 4 percent and an increase of 288 +/- 56 percent between 0 and 60 minutes after inhalation of the allergen (early response) and a decrease of 35 +/- 5 percent and an increase of 301 +/- 40 percent between 4 and 12 hours (late response). After furosemide administration (4 ml; 10 mg per milliliter), the early response to inhaled allergen was markedly attenuated in all the subjects, and the late response in all but one. The maximal changes in the FEV1 and specific airway resistance were, respectively, a decrease of 11 +/- 2 percent and an increase of 61 +/- 2 percent between 0 and 60 minutes and a decrease of 20 +/- 4 percent and an increase of 178 +/- 25 percent between 4 and 12 hours (P less than 0.05 for all comparisons). No significant differences were seen in the bronchoconstrictor response to inhaled methacholine after furosemide or placebo administration. We conclude that a furosemide-sensitive mechanism in the airways is involved in the pathogenesis of the reactions of patients with allergic asthma. Whether inhaled furosemide might be useful in the treatment of allergic asthma is uncertain and will require further study.

Source Information

Institute of Respiratory Diseases, University of Siena, Italy.

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