| Effects of Ductal Closure on Flow Velocities of Peripheral Pulmonary Arteries in Normal Term Infants |
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Hae-Soon Kim, Se Jeong Sohn, Young Mi Hong |
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Department of Pediatrics, College of Medicine, Ewha Womans University, Seoul, Korea |
| 정상 신생아의 폐동맥 분지 혈류속도에 대한 동맥관 폐쇄의 영향 |
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김혜순, 손세정, 홍영미 |
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이화여자대학교 의과대학 소아과학교실 |
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| 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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