left ventricular apexcardiography was performed in 260 normal subjects and 37 patients undergoing diagnostic cardiac catheterization : 13 without left heart disease ( group 1 ) , 18 with congestive cardiomyopathy ( group 2 ) and 6 with idiopathic hypertrophic subaortic stenosis ( group 3 ) .
C0225897
left ventricular
C0018787
cardiac