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GROWTH PATTERNS OF CARDIAC STRUCTURES AND CHANGES IN SYSTOLIC TIME INTERVALS IN THE NEWBORN AND INFANT: A Longitudinal Echocardiographic Study
Author(s) -
OBERHäNSLI I.,
BRANDON G.,
LACOURT G.,
FRIEDLI B.
Publication year - 1980
Publication title -
acta pædiatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/j.1651-2227.1980.tb07068.x
Subject(s) - medicine , diastole , cardiology , ventricular function , vascular resistance , systole , cardiac function curve , blood pressure , confidence interval , ejection fraction , cardiac output , heart failure
. Oberhänsli, I., Brandon, G., Lacourt, G. and Friedli, B. (Department of Pediatrics and Genetics, University Hospital, Geneva, Switzerland). Growth patterns of cardiac structures and changes in systolic time intervals in the newborn and infant. Acta Paediatr Scand, 69: 239, 1980.—A longitudinal study was undertaken in 21 newborns to determine cardiac growth pattern by echocardiography over the course of the first year of life. Most cardiac structures increased in size as a linear function of age and weight; however, the right ventricular end‐diastolic diameter remained unchanged so that the RV/LV ratio decreased as a parabolic function of age. Left and right ventricular systolic time intervals (RVSTI, LVSTI) after birth were also studied. The ratio of left ventricular preejection period (LVPEP) to left ventricular ejection time (LVET) decreased markedly immediately after birth and subsequently remained at a constant mean value (0.30 ± 0.04) for the rest of the study period. Right ventricular systolic time interval ratios (RVPEP/RVET) decreased rapidly and significantly during the first days of life (from a mean value of 0.39 ± 0.08 in the first 24 hours to 0.28 ± 0.05 on the 6th day of life). Constant values of 0.24 ± 0.03 were found from the 3rd month of life onwards. The decrease in RVPEP/RVET in the first days of life followed a parabolic function reflecting the physiological decrease of pulmonary vascular resistance after birth.