Color Doppler echocardiography was performed to evaluate pulmonary venous flow pattern at 1st∼2nd day of birth in 84 fullterm newborns (36: patent ductus arteiosus, 48: closed ductus arteriosus). Aortic and pulmonic diameter, velocity and
integral
were
estimated.
The purpose of this study ascertained that patent ductus arteriousus changed the pulmonary vein velocity and flow integral. The results were as follows.
1) There was no significant difference in aortic diameter and peak velocity, but significant difference in flow integral before and after closure of ductus arteriosus.
2) There was no significant difference in pulmonic velocity and flow integral, but significant difference in diameter before and after closure of ductus arteriosus.
3) Early systolic flow velocity, late systolic flow velocity, diastolic flow velocity in pulmonary vein were higher in patent ductus arteriosus group at 1st∼2nd day, but atrial reversal flow velocity was not significantly different.
4) Diastolic pulmonary venous flow integral was higher in patent ductus arteriosus group at 1st∼2nd day.
Thus four distinct phases(early systolic wave, late systolic wave, diastolic wave, and atrial reversal wave) were identified before and after closure of ductus arteriosus. Left to right shunt via ductus arteriosus increased systolic, diastolic
pulmonic
venous velocity and diastolic flow integral.
We will investigate pulmonary venous flow patterns in other left to right congenital heart diseases or mitral regurgitation.
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