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The Mitral Regurgitation in Patent Ductus Arteriosus (PDA)

Journal of the Korean Pediatric Society 1994;37(3):317-321.
Published online March 15, 1994.
The Mitral Regurgitation in Patent Ductus Arteriosus (PDA)
Hyang Suk Yoon1, Soon Ho Choi2
1Department of Pediatrics, Won Kwang University, School of Medicine, Iri, Korea
2Department of Thoracic and Cardiovascular Surgery, Won Kwang University, School of Medicine, Iri, Korea
동맥관 개존에 동반된 승모판 폐쇄부전에 관한 연구
윤향석1, 최순호2
1원광대학교 의과대학 소아과학교실
2원광대학교 의과대학 흉부외과학교실
Mitral regurgitation (MR) was analyzed by Doppler echocardiography, preoperatively and postoperatively, in 59 patients with patent ductus arteriosus (PDA). The ratio of left atrial dimension and aortic root dimension (LAD/LOD) and the maximal velocity of the mitral valve (MV max) were compared in pre, postop group. The degree of the regurgitation was given to the MR group. In preop MR group (13 of 59.22%), we compared the LAD/AOD by echo and the Qp/Qs by catheterization with non-MR group. The following results were obtained: 1) In preop MR group, about half of them had a grade 1 regurgitation, where as one fourth showed grade 2, remaining one fourth showed grade 3. The later were all changed to grade 2, postoperatively. The whiffle or mild MR (grade 1 or 2) shown preoperatively were slightly reduced in their degrees of regurgitation, but most were not disappeared and persisted to 7th postop day. 2) LAD/AOD and MV max were significantly reduced at postop state of PDA. 3) In preop MR group (n=13), LAD/AOD was significantly increased. Qp/Qs was higher in MR≥grade 2 group (n=6). In conclusion, left atrial dilatation could be a factor causing mitral regurgitation in the PDA. The amount of the pulmonary blood flow also related to that. The size of the PDA itself, Rp/Rs and associated cardiac lesions were not related to the regurgitation.
Key Words: Patent Ductus Arteriosus (PDA), Mitral Regurgitation (MR)

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