we evaluated the effectiveness of oral verapamil therapy for control of ventricular rate in digitalized patients with atrial fibrillation ( af ) with three clinical problems : chronic af with rapid rate at rest ( four patients ) , chronic af with accelerated rate during modest exercise ( five patients ) , and rapid rates during paroxysmal af ( four patients ) .
C0042523
verapamil
C0004238
atrial fibrillation