[ECG features of hypertrophy in hypertrophic cardiomyopathy, with special reference to asymmetric septal hypertrophy].
Thirty-eight cases of hypertrophic cardiomyopathy associated with asymmetric septal hypertrophy (ASH) were analyzed in order to correlate the electrocardiographic findings with the distribution of hypertrophic portions identified by two-dimensional echocardiograms. The electrocardiographic features which characterize the selected cases with ASH in this study were abnormal Q waves or regression of R waves in the left precordial leads (six obstructive type and six non-obstructive type) and a pattern of left ventricular hypertrophy (LVH) (31 cases including five cases with abnormal Q waves) (Table 1). There was no significant relation between the voltage of a R wave in V1 and the degree of septal thickness. From the electrocardiographic features mentioned above, the patients were divided into two groups, i.e., 1) the patients with abnormal Q waves (12 cases) and 2) those with LVH without abnormal Q waves (26 cases). The difference in the pattern of distribution of hypertrophy was evaluated based on the presence or absence of the abnormal Q waves. The results were as follows: Although there were no differences in the degree of septal thickness in both groups, the posterior wall in the group with LVH was significantly thicker. The group with LVH showed diffuse hypertrophy in the left ventricular free wall as well as the septum. Moreover, the short-axis view of two-dimensional echocardiograms revealed that hypertrophy in the septum was diffuse in both anterior and posterior portions.(ABSTRACT TRUNCATED AT 250 WORDS)
D000328:Adult; D000368:Aged; D002312:Cardiomyopathy, Hypertrophic / Q000175:diagnosis*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged