hemodynamic effects of the beta-receptor-blocking agent metoprolol ( 100 mg orally ) and the calcium antagonist verapamil ( 160 mg orally ) were analyzed in 24 patients with atrial fibrillation of different etiology ( idiopathic atrial fibrillation , 6 cases ; congestive cardiomyopathy , 6 cases ; mitral stenosis , 5 cases ; mitral regurgitation , 6 cases ) .
C0042523
verapamil
C0004238
atrial