SummaryThe bronchodilator and cardiac effects produced by aerosols of 0G5% salbutamol and 0(5% and 1% rimiterol administered for three minutes in 40% oxygen by intermittent positivepressure ventilation (I.P.P.V.) were compared in 15 asthmatic patients. Salbutamol and both the concentrations of rimiterol were equipotent in peak bronchodilator effect, but salbutamol had a significantly longer duration of bronchodilator action. There was significantly less increase in heart rate after rimiterol than after salbutamoL Aerosols of 0-5% rimiterol, 0 5% salbutamol, and saline were administered by I.P.P.V. to 10 normal volunteers. There was no difference between the mean heart rates after 0 5% rimiterol and saline but a highly significant increase in mean heart rate was observed after 05% salbutamol. It was concluded that 0(5% rimiterol was an effective short-acting bronchodilator drug with little or no cardiac beta1-adrenergic activity when administered for three minutes by I.P.P.V. in 40% oxygen.
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