Echocardiography can predict which patients will develop severe mitral regurgitation after percutaneous mitral valvulotomy
Key result
Echocardiographic score ≥10 strongly predicts severe MR after percutaneous mitral valvulotomy.
- P<0.001
- n=62
Why the study?
Severe mitral regurgitation after percutaneous mitral valvulotomy is a major complication carrying an adverse prognosis that has not been predictable in advance.
Does a pre-procedural echocardiographic score predict severe mitral regurgitation after percutaneous mitral valvulotomy?
Comparison
31 patients who developed severe mitral regurgitation vs 31 matched controls who did not
Design
Matched case-control study
Authors
Discussion
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Key expert perspectives
Captured external expert commentary on this paper, strongest first. Original sources are linked where available.
“Whether one uses the scoring system of Padial et al. or Wilkins et al., neither could be relied upon to predict for certain the acute outcome of most of the patients subjected to PBMV using the Inoue balloon catheter. This has been amply proven by multicenter studies from both the United States and China.”
NENick E. MezilisCardiologist, Thessaloniki Heart Institute
“Although the long-term outcome of percutaneous balloon mitral valvuloplasty (PBMV) can be predicted on the basis of patients' baseline characteristics, the development of severe mitral regurgitation is an unpredictable event in a large proportion of patients. However, anatomical studies of torn leaflets after valvotomy using the Inoue balloon show consistently thin leaflet areas and asymmetrically thickened commissures. Rupture occurs usually along these thin areas.”
“a score that is able to identify patients who are more likely to develop significant mitral regurgitation post-PMV. This score takes into account the distribution (even or uneven) of leaflet thickening and calcification, the degree and symmetry of commissural disease, and the severity of subvalvular disease.”
Implication
May support refined selection for percutaneous mitral valvulotomy; leaves open prospective validation before practice change.
Key Points
- To identify two-dimensional echocardiographic features associated with severe mitral regurgitation following percutaneous mitral valvulotomy and integrate them into a predictive score.
- Evaluated a consecutive series of 566 patients undergoing percutaneous mitral valvulotomy, identifying 37 (6.5%) who developed severe post-procedural mitral regurgitation.
- Matched 31 affected patients having baseline echocardiograms with 31 controls by age, gender, valve area, and pre-procedural mitral regurgitation severity.
- Constructed a 0–16 echocardiographic score grading uneven anterior/posterior leaflet thickness, commissural disease, and subvalvular involvement (each graded 0–4).
- Total echocardiographic scores were significantly higher in the severe regurgitation group than in controls (11.7 ± 1.9 vs. 8.0 ± 1.2, p < 0.001), as were individual subscores for anterior leaflets, commissures, and subvalvular structures (all p < 0.001).
- A total echocardiographic score cutoff of ≥10 predicted post-procedural severe mitral regurgitation with a sensitivity of 90 ± 5% and a specificity of 97 ± 3%.
- Stepwise logistic regression analysis confirmed the echocardiographic score as the sole independent predictor of severe mitral regurgitation after the procedure (p < 0.0001).
Study Design
Type
Case-Control (n=62)
Structured PICO
Does a pre-procedural echocardiographic score predict severe mitral regurgitation after percutaneous mitral valvulotomy?
P
Population
62 patients who underwent percutaneous mitral valvulotomy, including 31 who developed severe mitral regurgitation and 31 matched controls who did not.
E
Exposure
Pre-procedural echocardiographic score (evaluating uneven distribution of thickness in anterior and posterior mitral leaflets, degree of commissural disease, and subvalvular disease involvement, graded 0-16).
O
Outcome
Development of severe mitral regurgitation after percutaneous mitral valvulotomy (assessed by angiography).safety
Main Result
Absolute Event Rate: 11.7% vs 8%
p-value: p=< 0.001
A novel pre-procedural echocardiographic score can accurately predict the development of severe mitral regurgitation after percutaneous mitral valvulotomy, which may aid in patient selection.
Cite This Study
Padial et al. (1996) conducted a case-control in Patients undergoing percutaneous mitral valvulotomy (n=62). Echocardiographic score vs. Patients who did not develop severe mitral regurgitation was evaluated on Total mitral regurgitation echocardiographic score (p=< 0.001). An echocardiographic score ≥10 predicted the development of severe mitral regurgitation after percutaneous mitral valvulotomy with a sensitivity of 90% and a specificity of 97%.