CLINICAL TRIAL
JOURNAL ARTICLE
RANDOMIZED CONTROLLED TRIAL
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Effect of inhaled furosemide in acute asthma.

We assessed the acute bronchodilator effect of nebulized furosemide when added to conventional therapy of acute emergency department (ED) asthma. Using a double-blind design, 42 patients with acute asthma were randomized to receive 2.5 mg nebulized salbutamol and either 40 mg of nebulized furosemide or saline solution. We recorded clinical variables (respiratory rate, heart rate, and pulsus paradoxus) and peak expiratory flow rates (PEFR) before and 15 and 30 min after therapy. We found no significant difference in PEFR between salbutamol/furosemide and salbutamol/saline-treated patients 15 and 30 min following inhalation. Other endpoints were equally unaffected. However, when we examined separately those patients whose exacerbations were of relative short duration (< 8 hr), PEFR improved significantly more in the furosemide-treated group. At 15 min, PEFR increased by 82 +/- 48% in the furosemide group compared to 35 +/- 40% in the control group (p = 0.03), an effect that was also evident at 30 min when PEFR had increased by 113 +/- 49% in the furosemide group versus 61 +/- 35% in the control group (p = 0.014). Respiratory rate, heart rate, and pulsus paradoxus improved with no differences between the groups. The beneficial effect of furosemide was not evident in patients who reported more prolonged duration (> 8 hr) of asthmatic symptoms. The response to furosemide appeared to be unrelated to concomitant ED therapy with corticosteroids, to baseline pulmonary function, or to patient demographic variables. We conclude that furosemide may offer additive bronchodilator benefits in acute naturally occurring asthma of relative short duration.

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