[Effect of extent and distribution of left ventricular hypertrophy on clinical aspects and hemodynamics of patients with hypertrophic obstructive cardiomyopathy].
The influence of the extent and distribution of the echocardiographically determined left-ventricular hypertrophy was evaluated in respect to clinical symptoms and hemodynamics at rest and under bicycle-exercise. 49 patients with hypertrophic obstructive cardiomyopathy [HOCM] (34 men, 15 women, mean age 43 years, subvalvular gradient after provocation 10-270 mm Hg, ejection fraction greater than 55%) and 10 controls (seven men, three women, mean age 44 years) were investigated. Enddiastolic left-ventricular diameter and basal thickness of the anterior and posterior septum, and the lateral and posterior wall of the left ventricle were echocardiographically measured. The distribution of basal hypertrophy (for the anterior septum and the posterior wall greater than or equal to 15 mm, for the posterior septum and the lateral wall greater than or equal to 17 mm) was classified as type I (1 segment, n = 17), II (2, n = 14) and III (greater than or equal to 3 segments, n = 18), according to Maron et al. (1981). At rest and during symptom-limited bicycle exercise, cardiac index (CI), stroke volume index (SVI), and mean pulmonary capillary wedge pressure (PCWP) were determined at sinus rhythm by a Swan-Ganz-catheter and by the thermodilution method.


RESULTS
With increasing hypertrophy, there was a reduction of the left-ventricular enddiastolic diameter. A NYHA-class greater than II was observed in 18% of patients with type-I hypertrophy, in 29% with type II, but in 61% with type III (p less than or equal to 0.05). Of patients with type III, 44% (p less than or equal to 0.05). In type-III hypertrophy the with type I 6% had suffered syncopes; with type II, 14%, and with type III, 44% (p less than or equal to 0.05). In type-III hypertrophy the maximum exercise level (72 +/- 24 Watt) was significantly (p less than 0.05) lower compared with controls (110 +/- 42 W), in type I (99 +/- 35 W), and in type II (100 +/- 45 W). At maximum stress PCWP was significantly increased in types I, II, and III (type I = 22 +/- 8 mm Hg, II = 24 +/- 12 mm Hg, III = 29 +/- 8 mm Hg) compared with controls (8 +/- 4 mm Hg); SVI was significantly lower in type III (49 +/- 13 ml/m2) than in controls (65 +/- 12 ml/m2) and in type I (60 +/- 11 ml/m2); SVI was 60 +/- 17 ml/m2 in type II. At maximum stress, cardiac index was significantly lower in type III (6.2 +/- 2.1 l/min/m2) than in controls (8.9 +/- 2.1 l/min/m2) and in type I (8.4 +/- 1.7 l/min/m2).


CONCLUSIONS
In patients with HOCM, severe left-ventricular hypertrophy type III accompanied by a reduced ventricular cavum is associated with more pronounced clinical symptoms, a reduced working capacity and the occurrence of syncopes. In these patients, despite increased filling pressures, the increase in stroke volume and cardiac index are insufficient at stress. Therefore, echocardiographically evaluated left-ventricular hypertrophy and geometry are helpful to estimate the severity of functional disorder in HOCM.
Schwartzkopff
B
B
Medizinische Klinik und Poliklinik B. Heinrich-Heine-Universität, Düsseldorf.
Schwammenthal
E
E
Lösse
B
B
Steeg
M
M
Strauer
B E
BE
D000328:Adult; D002302:Cardiac Output / Q000502:physiology; D002306:Cardiac Volume / Q000502:physiology; D002312:Cardiomyopathy, Hypertrophic / Q000000981:diagnostic imaging / Q000503:physiopathology*; D004452:Echocardiography; D005080:Exercise Test; D005260:Female; D006346:Heart Septum / Q000000981:diagnostic imaging / Q000503:physiopathology; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D016277:Ventricular Function, Left / Q000502:physiology*
Einfluss von Ausmass und Verteilung der linksventrikulären Hypertrophie auf die Klinik und die Hämodynamik von Patienten mit hypertroph obstruktiver Kardiomyopathie.