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Progression to moderate or severe mitral regurgitation after percutaneous transvenous mitral commissurotomy using
T Matsubara1, M Yamazoe, Y Tamura
1First Department of Internal Medicine, Niigata University School of Medicine.
Abstract:
Progression to moderate or severe mitral regurgitation (MR) was studied after Inoue balloon percutaneous transvenous mitral commissurotomy (PTMC) using the stepwise inflation technique, performed at increments of 1 mm of balloon diameter, in 49 consecutive patients with rheumatic mitral stenosis (aged from 32-73 years; 8 males, 41 females). The patients were classified on the basis of the degree of MR after PTMC, compared with that before PTMC, into either Group A, development of moderate or more severe (> or = grade 2) MR (n = 8) or Group B, no increase in MR or development of mild (grade 1) MR (n = 41). Progression to moderate or severe MR was significantly associated only with advanced age (60 +/- 8 vs 52 +/- 10 years, p < 0.05) and narrower mitral valve area (0.87 +/- 0.35 vs 1.11 +/- 0.29 cm2, p < 0.05), but other characteristics before PTMC were similar in both groups. There was no difference between the two groups in the total number and degree of balloon inflation. Immediately before the final inflation, the left atrial mean pressure and v wave pressure were decreased in smaller degrees in Group A compared with Group B (-2 +/- 2 vs -5 +/- 4 mmHg, p < 0.05; -2 +/- 2 vs -6 +/- 6 mmHg, p < 0.05, respectively). Thus, the stepwise inflations require careful monitoring of changes in the left atrial pressure and waveform to recognize the aggravation of MR, especially in older patients with severe stenosis. Patients who do not have a significant drop in left atrial mean pressure and v wave pressure during stepwise inflations of the balloon might be at risk of development of moderate or severe MR after further dilations.
Insights
Progression to moderate or severe mitral regurgitation after Inoue balloon percutaneous transvenous mitral commissurotomy is linked to older age and narrower mitral valve area. Careful monitoring of left atrial pressure is crucial during stepwise inflations.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiac Surgery
Background:
- Rheumatic mitral stenosis is a common valvular heart disease.
- Percutaneous transvenous mitral commissurotomy (PTMC) is a key treatment for mitral stenosis.
- Progression of mitral regurgitation (MR) post-PTMC requires careful evaluation.
Purpose of the Study:
- To investigate factors associated with the progression to moderate or severe MR after Inoue balloon PTMC.
- To identify predictors of MR development in patients undergoing PTMC for mitral stenosis.
Main Methods:
- A cohort of 49 patients with rheumatic mitral stenosis undergoing Inoue balloon PTMC was studied.
- Patients were categorized based on MR development post-PTMC (moderate/severe vs. mild/none).
- Pre-procedural characteristics and hemodynamic changes during stepwise balloon inflations were analyzed.
Main Results:
- Progression to moderate/severe MR was significantly associated with advanced age (p < 0.05) and narrower mitral valve area (p < 0.05).
- Patients with MR progression showed smaller decreases in left atrial mean pressure and v wave pressure before final inflation (p < 0.05).
- No significant differences were observed in the number or degree of balloon inflations between groups.
Conclusions:
- Advanced age and severe mitral stenosis increase the risk of developing moderate or severe MR post-PTMC.
- Monitoring left atrial pressure changes during stepwise balloon inflations can help predict MR aggravation.
- Careful patient selection and procedural monitoring are essential to minimize MR progression after PTMC.