[Chronocardiometry in healthy children. II. Diastolic time intervals]

At the National Institute of Pediatrics DIF (called before IMAN) a prospective study of diastole time intervals (DTI) was performed on 138 healthy children by phonomechanocardiography. The correlation of the DTI with age and heart rate (HR) was studied. Also the relationship of the DTI with systolic times intervals (STI) was studied. The age of children did not show significant correlation with the DTI. Isovolumic relaxation phase (IVRP), tachydiastolic phase (TDP) and presystolic phase (PSP) were slightly modified by HR and obviously, without significance. But instead, the bradidiastolic phase (BDP), effective diastole (ED) or the time on which the mitral valve is opened and total diastole (D) showed directly proportional relation with R-R interval of the ECG (P less than 0.001). The left ventricular ejection time (LVET) was longer according to the ED duration (r = 0.818). The ejection fraction (EF) showed proportional increase to the ED duration, but without statistics significance. The influence of the DTI that have upon STI is important.