[1st derivatives of the apex cardiogram and carotid sphygmogram and their clinical use in aortic valve defects and hypertrophic subaortic stenosis].

Twenty seven patients with valvular aortic stenosis were examined as well 26 patients with hypertrophic subaortic stenosis and 48 subjects with sound hearts, to whom a record was made, consisting of electrocardiogram, phonocardiogram, carotis -- sphigmogram, first derivative of carotis-sphigmogram (dC/dt), apexcardiogram and first derivative of apexcardiogram (dA/dt). Slope index of carotis-sphigmogram was calculated on the base of dC/dt as well as the maximum rate of pressure elevation in carotid artery (max dC/dt), whereas on the base of dA/dt the slope index of apexcardiogram and the interval R--dA/dt were determined. In patients with valvular aortic stenosis dC/dt shows a statistically significance of diminution of the slope index of carotissphigmogram, reduction of max dC/dt and notched descendent arm of the positive peak from dC/dt. In the patients with hypertrophic subaortic stenosis an increased slope index of apexcardiogram was established and a shortening of R--dA/dt interval. It was concluded that dA/dt and dC/dt could give new additional data for the diagnosis and evaluation of the hemodynamics in valvular aortic defects and hypertrophic subaortic stenosis.