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Minimal requirement of effective dilation diameter of balloon(s) in percutaneous transluminal mitral valvotomy
Insights
A Balloon-Mitral Annular Ratio (BMAR) exceeding 0.80 is crucial for percutaneous transluminal mitral valvotomy (PTMV). This ratio ensures significant improvements in stroke volume index and long-term exercise capacity following the procedure.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiac Surgery
Background:
- Percutaneous transluminal mitral valvotomy (PTMV) is a key intervention for mitral stenosis.
- Optimizing procedural success requires understanding the relationship between balloon size and mitral annulus dimensions.
- The Balloon-Mitral Annular Ratio (BMAR) is a proposed metric to standardize this relationship.
Purpose of the Study:
- To determine the minimal effective Balloon-Mitral Annular Ratio (BMAR) for achieving optimal hemodynamic and long-term outcomes in PTMV.
- To investigate the impact of different BMAR thresholds on immediate and follow-up results.
Main Methods:
- Forty patients undergoing PTMV were retrospectively analyzed.
- Patients were categorized into groups based on BMAR (≥0.80 or <0.80).
- BMAR was calculated using the ratio of effective balloon dilation diameter to mitral annular diameter (measured by echocardiography).
Main Results:
- Immediate hemodynamic improvements (reduced gradients, increased mitral valve area) were observed even with BMAR <0.80.
- Significant increases in stroke volume index post-PTMV required a BMAR ≥0.80.
- Enhanced long-term exercise duration was achieved only when BMAR was ≥0.80.
Conclusions:
- A BMAR exceeding 0.80 is essential for achieving satisfactory immediate hemodynamic results and significant long-term benefits from PTMV.
- The BMAR serves as a critical predictor for successful PTMV outcomes, influencing both acute and chronic patient status.
Abstract:
40 patients are included to study the minimal requirement of effective dilation diameter of balloon(s) in performing percutaneous transluminal mitral valvotomy (PTMV) to obtain good hemodynamic and long-term follow-up consequences. The patients are divided into 2 groups depending on the ratio of effective dilation diameter of balloon(s) (determined by calculating the cross-sectional area of the oval enveloping the one or two balloons and then taking the diameter of the circle with the same area) to mitral annular diameter (determined by 2-dimensional echocardiography) (Balloon-Mitral Anular Ratio, BMAR). BMAR in group 1 may be equal to or greater than 0.80 or 0.90, BMAR in group 2 may be less than 0.80 or 0.90. From the careful analysis, the statistically significant immediate hemodynamic improvement, e.g. the reduction of trans-valvular pressure gradient, left atrial pressure, pulmonary artery systolic pressure, the increase of mitral valve area, can be obtained even BMAR is less than 0.80. However, the increase of stroke volume index after PTMV can only be obtained with the BMAR equal to or greater than 0.80. The long-term improvement, determined by greater increment of exercise duration, is also only obtained if the BMAR equal to or greater than 0.80 at PTMV. Therefore, we conclude that to obtain the adequate and satisfactory immediate hemodynamic and long-term follow-up results of PTMV, the BMAR must exceed 0.80.