title: [Chronodynocardiometry in healthy children. 1: Systolic times].
abstract: At the National Institute of Pediatry (IMAN) were studied the phonomechanocardiographic recorders obtained of 125 children, all were eutrophic and healthy. The measure of the systolic time intervals were the purpose of the study. Children's age varied from 2 months old to 18 years old; 82 boys and 43 girls. The duration of the R-R space increased according to age (P less than 0.001), the electroacoustic systole and the ejection time showed more duration in older children (r = 0.61 and 0.77 respectively). In opposite, the pre-ejection time as well as its phases, had a similar duration in all ages. Tables of values and ranges of the systolic time intervals according to age are presented. The systolic time intervals were correlated to the R-R space duration, and showed a direct proportion with the electroacoustic systole (r = 0.76) and ejection time (r = 0.83), but the pre-ejection time had not significant changes. The electroacoustic diastole duration was proportional to the R-R space (r = 0.96). The regression equations were calculated to evaluate the normal range of the systolic time intervals in children, obviously in accordance to cardiac frequency.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D009200:Myocardial Contraction; D010701:Phonocardiography; D012016:Reference Values; D013599:Systole
vernacular_title: Cronodinocardiometría en niños sanos. Primera parte: tiempos sistólicos.