All issues > Volume 32(2); 1989

Original Article

J Korean Pediatr Soc. 1989;32(2):158-164. Published online February 28, 1989.

Doppler Echocardiographic Studies on Hemodynamic Changes in Early Neonatal Period.

Myung Kul Yum¹

¹Department of Pediatrics, College of Medicine, KyungSang National University, Jinju, Korea

Received: August 16, 1988;  Accepted: September 26, 1988.

Abstract

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.

Keywords :neonatal hemodynamics