when delivered by an intermittent positive-pressure breathing device to 24 nonsmoking young adult asthmatic subjects , fenoterol produced significant improvement in forced expiratory volume at 1 second ( fev1 ) , in maximum midexpiratory flow ( fef25-75 % ) , and in forced expiratory flow at 25 per cent of vital capacity ( fef25 % ) for 6 to 8 hours , whereas isoproterenol and isoetharine with phenylephrine produced improvement for 1 and 2 hours , respectively .
C0004096
asthmatic
C0022176
isoetharine