nifedipine and verapamil , but not diltiazem , also reduced ( p less than 0.05 ) the tachycardia produced by electrical stimulation of the cardioaccelerator nerve at doses which did not alter the heart rate response to direct beta-adrenoceptor stimulation by isoproterenol ( 0.1 microgram/kg i.v . ) .
C0039231
tachycardia
C0022245
isoproterenol