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Doppler Echocardiographic Studies on Hemodynamic Changes in Early Neonatal Period.

Journal of the Korean Pediatric Society 1989;32(2):158-164.
Published online February 28, 1989.
Doppler Echocardiographic Studies on Hemodynamic Changes in Early Neonatal Period.
Myung Kul Yum
Department of Pediatrics, College of Medicine, KyungSang National University, Jinju, Korea
도플러를 이용한 신생아 초기의 혈역학적 변화에 대한 연구
경상대학교 의과대학 소아과학교실
Received: 16 August 1988   • Accepted: 26 September 1988
Postnatal circulatory changes were studied with doppler echocardiography in 40 normal full term neonate before 6 hours, between 6 and 24 hours, and after 24 hours of age. The results of study were as follows; 1) Pulmonary artery flow velocity integral per minute which means total systemic blood flow increased during those period (854±58, 1027±128, 1198±57 cm/min). 2) Flow velocity integral per minute in ascendiing aorta which means total pulmonic flow increased initially and then decreased after 24 hours of age (1451±82, 1578±97, 1259±89 cm/min) 3) Acceleration time in pulmonary artery increased during those periods (47±2, 66±4, 97±6 msec) which means physiologic decline of pulmonary artery perssure during early neonatal period. 4) E/A ratio of tricuspid valve showed no change during these periods (0.74-0.77), and this means right ventricular compliance does not increase during early neonatal period, and this ratio is lower than that of mitral valve (1.2). 5) Ductus closure time is between 18 hours and 30 hours of age.
Key Words: neonatal hemodynamics

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