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/AOD) and the maximal
velocity
of the mitral valve (MVmax) 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.
@ES The following results were obtained:
@EN 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 MVmax 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.
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