Distribution of hypertrophy in obstructive and non-obstructive types of hypertrophic cardiomyopathy.

70 patients with hypertrophic cardiomyopathy were examined by one-dimensional, two-dimensional and pulsed Doppler echocardiography. According to the degree and distribution of hypertrophy in left ventricular (LV) short axis views, the findings were divided into 5 types. In type I, hypertrophy affected only the interventricular septum (10 patients, i.e. 14.2%). In type II, hypertrophy involved besides the septum, also the LV anterior wall (type IIa-26 patients; 37.1%) or lateral wall (type IIb-21 patients; 30.0%). Type III included patients with hypertrophy of the LV posterior wall (3 patients; 4.3%). Six patients (8.5%) had a distinct hypertrophy of the whole apical part of the LV and septum (type IV). Type V was represented by concentric hypertrophy of the LV and septum (4 patients; 5.7%). Hypertrophy of the right ventricular myocardium was found in 6 patients.