| Doppler Echocardiographic Studies on Hemodynamic Changes in Early Neonatal Period. |
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Myung Kul Yum |
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Department of Pediatrics, College of Medicine, KyungSang National University, Jinju, Korea |
| 도플러를 이용한 신생아 초기의 혈역학적 변화에 대한 연구 |
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염명걸 |
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경상대학교 의과대학 소아과학교실 |
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Received: 16 August 1988 • Accepted: 26 September 1988 |
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| Abstract |
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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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