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[Chronodynocardiometry in healthy children. 1: Systolic times]
Insights
This study analyzed systolic time intervals in 125 healthy children, finding that R-R interval, electroacoustic systole, and ejection time increase with age. Regression equations were developed to establish normal pediatric ranges based on cardiac frequency.
Area of Science:
- Pediatric Cardiology
- Cardiovascular Physiology
Context:
- Assessing pediatric cardiovascular health requires understanding normal physiological parameters.
- Systolic time intervals (STIs) are crucial indicators of cardiac function.
- Establishing age-specific reference values for STIs in children is essential for accurate diagnosis.
Purpose:
- To measure and analyze systolic time intervals in a cohort of 125 healthy children aged 2 months to 18 years.
- To determine the correlation between STIs and age, as well as R-R interval duration.
- To develop regression equations for evaluating normal STI ranges in children based on cardiac frequency.
Summary:
- Phonomechanocardiographic recordings from 125 healthy children (82 boys, 43 girls) were analyzed for systolic time intervals.
- R-R interval duration, electroacoustic systole, and ejection time significantly increased with age (P < 0.001).
- Pre-ejection time remained consistent across all age groups, while electroacoustic diastole correlated with R-R interval duration.
Impact:
- Provides age-specific reference values and regression equations for pediatric systolic time intervals.
- Enhances the accuracy of diagnosing cardiac abnormalities in children.
- Contributes to the understanding of normal cardiovascular development in pediatric populations.
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.