[Study on the medium normalized velocity of circumferential lengthening of the fiber using ultrasound. I. Evaluation of left-ventricular compliance]. FT Studio della velocita media normalizzata di allungamento circonferenziale della fibra mediante ultrasuoni. Nota I - Valutazione della compliance ventricolare sinistra

The following parameters obtained by echocardiography have been measured in a group of normal subjects and in a group suffering from hypertrophic subaortic stenosis (IHSS): 1) speed of mitral valve protodiastolic closing (MVV); 2) circumferential lengthening speed of the fibre (MVCL) both standardized and otherwise. There is a good correlation between MVCL and MVV (P = 0.01 and 0.05). Since a low mitral valve closing rate is an indirect index for measuring ventricular compliance, the use of the MVCL can be considered valid for the same purposes. Using this it has in fact been possible to distinguish subjects with IHSS in which lower MVV is an index of reduced compliance, from normal subjects.