Reversal of bronchial obstruction in children with mild stable asthma by aerosolized furosemide.

Aerosolized furosemide has been shown to prevent the worsening of different variables in pulmonary function testing, following exercise or bronchial provocation with numerous agents. To investigate if aerosolized furosemide has a bronchodilator effect, we performed two prospective, randomized, placebo-controlled, double-blinded and crossover studies of four aerosol regimens in children with mild chronic asthma. In a pilot study examining three different doses of furosemide in 11 children, the dose of 1.0 mg/kg resulted in a mean maximum increase of 30.0 +/- 6.8% in forced expiratory flow between 25 and 75% vital capacity (FEF25-75), compared with a 3.1 +/- 6.8% increase after aerosolized normal saline. The effect was observed after 10 minutes with a mean percent change of 17.7 +/- 1.7% from baseline, that persisted to 30 minutes (19.3 +/- 3.7%) and was significantly greater than that seen following aerosolized placebo (1.4 +/- 2.9% and 0.7 +/- 3.4%, respectively; P < 0.05). We then compared the effect of furosemide with that of aerosolized albuterol (0.15 mg/kg) in 18 patients. There was no statistically significant difference in the improvement observed in forced expiratory volume in 1 second (FEV1) for albuterol (15.0 +/- 2.7%) compared with furosemide (12.1 +/- 2.9%) or in FEF25-75 (42.9 +/- 9.0% versus 26.3 +/- 6.7%). The addition of albuterol to furosemide resulted in a 17.2 +/- 5.9% increase in FEV1 and a 51.1 +/- 13.9% increase in FEF25-75. Our results indicate that aerosolized furosemide has a bronchodilator effect in children with mild stable asthma.