the ca2+ entry blockers diltiazem , nifedipine and verapamil produced dose-dependent increases in atrioventricular conduction time ( a-h interval ) , while decreasing heart rate and mean arterial pressure in anesthetized dogs previously subjected to ganglionic blockade to prevent hypotension-induced reflex changes in sympathetic tone .
C0028066
nifedipine
C0020649
hypotension