[Exercise echocardiography in different types of hypertension classified by left ventricular geometry; comparison with hypertrophic cardiomyopathy].
We investigated left ventricular (LV) function in 40 patients (pts) with hypertension (HT), 16 pts with hypertrophic cardiomyopathy (HCM), 3 pts with ASH and HT and in 27 control subjects by M-mode echocardiography using supine exercise (50 watts, 3 minutes). The hypertensive subjects were echocardiographically divided into three subsets; the normal LV (17 cases), the hypertrophied LV (17 cases) and the dilated LV (6 cases). Similarly, pts with HCM were echocardiographically and cineangiographically divided into three subsets; ASH (asymmetric septal hypertrophy, 6 cases), APH (predominant apical hypertrophy, 6 cases) and DFH (diffuse left ventricular hypertrophy, 4 cases). Changes of left ventricular dimension Controls and HT: Stroke volume was increased during exercise in the controls, normal LV and hypertrophied LV groups by decreasing LV end-systolic dimension ( LVDs ), but it was increased in dilated LV group by increasing LV end-diastolic dimension ( LVDd ) (Frank-Starling mechanism). LVDd was increased transiently in the controls and normal LV group during recovery, but its grade and duration were more pronounced in the latter. LVDd did not change significantly in hypertrophied and the dilated LV groups. HCM: LVDd and LVDs did not change significantly during exercise in all 3 groups. LVDd was increased transiently during recovery in ASH group, but not in the other groups. Changes of peak velocity of circumferential fiber shortening (VCF) and the ratio of peak systolic blood pressure to LV end-systolic volume (PSP/ LVVs ). Controls and HT: Peak VCF was increased during exercise most markedly in the normal LV group, but it was not increased in the dilated LV group. PSP/ LVVs was increased significantly during exercise in the controls, the normal and hypertrophied LV groups, but not in the dilated LV group. HCM: Peak VCF showed a significant increase during exercise in ASH group, but not in the other two groups. Changes of the D/S ratio. The ratio of systolic to diastolic velocity of the LV posterior wall was expressed as a D/S. This ratio did not change significantly in the controls, HT and APH groups, but it was decreased significantly in ASH and DFH groups. LV end-systolic wall stress and LVDs relationship ( ESWst - LVDs ).(ABSTRACT TRUNCATED AT 400 WORDS)
D000328:Adult; D001794:Blood Pressure; D002312:Cardiomyopathy, Hypertrophic / Q000503:physiopathology*; D004452:Echocardiography / Q000379:methods*; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D006973:Hypertension / Q000145:classification / Q000503:physiopathology*; D008875:Middle Aged; D009200:Myocardial Contraction; D005082:Physical Exertion