| A Cause of Transient Systolic Murmur in Neonates Physiologic Pulmonary Artery Stenosis |
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Hyun Joo Kwak, Phil Seob Sim, Kwang Chul Lee, Chang Sung Sohn, Joo Won Lee, Young Chang Tockgo |
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Department of Pediatrics, College of Medicine, Korea University, Seoul, Korea |
| 신생아기의 기능성 수축기 잡음에 관하여 - 폐동맥 분지부의 생리적 협착- |
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곽현주, 심필섭, 이광철, 손창성, 이주원, 독고영창 |
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고려대학교 의과대학 소아과학교실 |
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| Abstract |
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A transient heart murmur is frequently heard in normal newborn who has no congenital heart disease. The cause of this murmur remains unclear but was speculated as hypoplasia of the pulmonary arterial branches or unusual alignment of the main pulmonary artery with its branches.
Pulsed Doppler and two-dimensional echocardiographic studies were undertaken in 19 newborn infants with a transient murmur and 13 infants without heart murmur and their pulmonary arterial peak flow velocity and diameters were evaluated. The peak flow velocity of right and left pulmonary artery in neonates with murmur were significantly higher than in neonates without murmur and the ratio of the diameter between right and left pulmonary artery to that of a main pulmonary artery in neonates with murmur group is smaller than in neonates without murmur.
The results demonstrated that the transient functional systolic murmur in neonates was considered most likely due to the relatively small size of pulmonary artery branches, disproportional to that of the main trunk. |
| Key Words:
Transient murmur, Peripheral pulmonary stenosis |
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