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Journal of the Korean Pediatric Society 2000;43(10):1318-1322.
Published online October 15, 2000.
Effects of Ductal Closure on Flow Velocities of Peripheral Pulmonary Arteries in Normal Term Infants
Hae-Soon Kim, Se Jeong Sohn, Young Mi Hong
Department of Pediatrics, College of Medicine, Ewha Womans University, Seoul, Korea
정상 신생아의 폐동맥 분지 혈류속도에 대한 동맥관 폐쇄의 영향
김혜순, 손세정, 홍영미
이화여자대학교 의과대학 소아과학교실
Abstract
Purpose
: This study was performed to evaluate whether a relationship may exist between transient peripheral pulmonary stenosis and the closure of the ductus arteriosus in term infants.
Methods
: A total of 69 healthy full-term infants had pulmonary artery and ductal color Doppler flow velocity assessment performed at of 10 hours age(group I), 1-2 days of age(group II), and 1-2 weeks of age(group III). We measured the following variables at the main pulmonary artery, the right pulmonary artery and the left pulmonary artery : diameter, flow velocity and velocity- time integral, acceleration time(AT), ejection time(ET).
Results
: Diameters of right and left pulmonary arteries of group III were smaller than that of group I(P<0.01). There was no difference between groups in terms of RPA/LPA diameter ratio. There was significant difference between groups in terms of right and left pulmonary artery peak flow velocities. Right pulmonary artery(RPA)/left pulmonary artery(LPA) peak velocity ratio of group III was lower than that of group I and group II. There were significant differences between groups in terms of the right and left pulmonary artery peak velocity-time integral. RPA/LPA peak velocity-time integral ratio of group III are lower than those of group I. There were significant differences between groups in terms of right and left pulmonary artery acceleration time/ejection time(P<0.05). There were no significant differences between groups in term of RPA/LPA AT/ET ratios. The increase of peak flow velocity % of RPA and LPA in groups II and III is higher than that of group I.
Conclusion
: Ductal constriction could explain increases in left pulmonary arterial flow velocities in full term infants.
Key Words: Arterial duct, Peripheral pulmonary stenosis


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