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- W306243726 abstract "In some asthmatics deep inspiration causes a sustained bronchoconstration, which is dependent on Ca2+ uptake. Inhaled diuretics protect against bronchoconstriction induced by a variety of indirect stimuli, by inhibiting the ionic fluxes involving Ca2+ uptake across the cell membrane of airway epithelium. The aim of this study was therefore to investigate the protective effect of inhaled furosemide on the bronchoconstriction induced by deep inspiration in asthma and to compare it with the effect of acetazolamide, an inhibitor of carbonic anhydrase devoid of effect on ion cotransport but possessing inhibitory effects on chloride ion influx and Na+/K+ exchange. The study was carried out on three different study days according to a randomized, double-blind, placebo-controlled, crossover design. Nine non smoking asthmatic subjects first performed a series of 9 controlled deep inspirations to TLC followed by forced expirations to RV within 20 min, which caused a decrease of FEV1 > 20% from baseline. Two hours later, the subjects inhaled either furosemide (40 mg), or acetazolamide (500 mg), or saline (placebo) in random order, and then two more deep-inspiration challenges were performed after 30 and 140 mins. The progressive percent decrement of FEV1 caused by deep-inspiration challenge was taken as an index of bronchoconstriction. Bronchoconstriction was significantly blunted at 30 mins, but not 140 mins, after inhaling furosemide (p < 0.01) or acetazolamide (p < 0.05) compared to control. We interpret these results as due to a modulation of ionic fluxes across the smooth muscle cell membrane afforded by inhaled furosemide and acetazolamide." @default.
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- W306243726 date "2003-11-26" @default.
- W306243726 modified "2023-09-23" @default.
- W306243726 title "The effect of inhaled furosemide and acetazolamide on bronchoconstriction induced by deep inspiration in asthma." @default.
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