title: [A-wave in calibrated apex cardiogram in hypertension. Studies during rest and after exertion].
abstract: Apexcardiographic examinations were carried out of 86 hypertensive patients without clinically manifest heart failure. The amplitude of the wave a (or the per cent fraction of the wave a of the total amplitude) and the maximal rate of wave rise, df/dta were statistically significantly higher in the hypertensive patients than in normal subjects. The findings are interpreted as a manifestation of an increased left ventricular rigidity and of an increased atrial contractility in hypertensive patients. No correlation was found between the apexcardiographic indicators checked and the indicators of the cardiac pump function. In 46 hypertensive patients, in addition, a dynamic exercise test was performed (50 W for 6 min); 1 minute after cessation of exercise an apexcardiogram was recorded. An increase in the a/T quotient (greater than or equal to 5%) was found in 20; a decrease (=5%), in 10; and no change (less than +/- 5%), in 16 hypertensive patients. The postexercise apexcardiographic changes had no correlations with haemodynamic changes occurring during exercise.
mesh_terms: D000293:Adolescent; D000328:Adult; D006321:Heart / Q000503:physiopathology*; D006801:Humans; D006973:Hypertension / Q000175:diagnosis* / Q000503:physiopathology; D007702:Kinetocardiography; D008875:Middle Aged; D005082:Physical Exertion; D012146:Rest
vernacular_title: Die a-Welle im kalibrierten Apexkardiogramm bei Hypertonikern. Untersuchungen in Ruhe und nach Belastung.