[Effect of tachycardia on hemodynamics and coronary circulation. Different relevance of ventricular tachycardias for healthy persons, coronary patients and patients with left heart hypertrophy].

Investigations on the haemodynamics, coronary flow and metabolism of tachycardias were carried out in 195 patients during routine diagnostic examinations (left ventricular catheterization; intracardiac electro-physiological studies) from 1974 to 1980. The following measurement methods were used: 1. controlled cardiac electrostimulation to simulate paroxysmal tachycardias (atrial, atrioventricular-sequential and ventricular stimulation); 2. intracardiac pressure; 3. cincecardiographic parameters; 4. coronary flow; 5. coronary reserve (dipyridamol vasodilation); 6. cardiac output; 7. myocardial ischaemia; 8. myocardial oxygen consumption. The results are presented as follows: I. Adaptive alterations of arterial pressure and coronary flow with an abrupt start and stop of a tachycardia paroxysm; II. Arterial pressure in the steady state of a tachycardia, metabolic effects, evidence of ischaemia and coronary reserve; III. Effects of a tachycardia on the determinant parameters of the aortic valve function in aortic stenosis before and after aortic valve replacement; IV. Definition of the atrial pump support of the left ventricle during tachycardia.