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Comparison of early versus late experience with percutaneous mitral balloon valvuloplasty
E M Tuzcu1, P C Block, I F Palacios
1Department of Medicine (Cardiac Unit), Massachusetts General Hospital, Harvard Medical School, Boston 02114.
Insights
Comparing percutaneous mitral balloon valvuloplasty techniques, a larger effective balloon dilating area in Group 1 correlated with more mitral regurgitation and procedure-related deaths, despite similar outcomes in valve area. This suggests optimizing balloon size is crucial for patient safety.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiac Surgery
Background:
- Percutaneous mitral balloon valvuloplasty (PMBV) is a key intervention for mitral stenosis.
- Optimizing procedural parameters, such as balloon size and dilation technique, is essential for maximizing efficacy and minimizing complications.
- Comparing early and later patient cohorts can reveal improvements in technique and outcomes over time.
Purpose of the Study:
- To compare the immediate outcomes of percutaneous mitral balloon valvuloplasty (PMBV) between an early group of patients (Group 1) and a later group (Group 2).
- To evaluate the impact of different atrial septal dilation techniques and balloon-to-body surface area ratios on procedural success and complications.
- To identify potential improvements in PMBV outcomes associated with evolving procedural experience.
Main Methods:
- Retrospective comparison of 150 patients (Group 1) and 161 patients (Group 2) undergoing PMBV.
- Analysis of baseline demographic and clinical characteristics, including echocardiographic scores and hemodynamic parameters.
- Comparison of procedural details, such as atrial septum dilation balloon size and effective balloon dilating area to body surface area ratio.
- Assessment of immediate outcomes, including mitral valve area, mitral regurgitation, left-to-right shunt, and procedure-related deaths.
Main Results:
- No significant differences in baseline characteristics or successful mitral valve area were observed between Group 1 and Group 2.
- Group 1 had a larger effective balloon dilating area to body surface area ratio (p = 0.0001).
- Group 1 experienced a higher incidence of increased mitral regurgitation (p = 0.02) and left-to-right shunt (p = 0.0001), along with three procedure-related deaths, compared to Group 2.
Conclusions:
- While PMBV achieved good results in both groups, the earlier technique (Group 1) using larger balloons was associated with increased mitral regurgitation and procedure-related mortality.
- The findings suggest that a more conservative approach to atrial septal dilation, as used in Group 2, may be safer.
- Refinement in PMBV techniques, particularly regarding balloon sizing and dilation strategy, has likely contributed to improved safety profiles in later patient cohorts.
Abstract:
The immediate outcome of the first 150 patients (Group 1) and the last 161 patients (Group 2) who underwent percutaneous mitral balloon valvuloplasty was compared. There was no difference between the two groups in age, gender, New York Heart Association functional class, presence of calcification, atrial fibrillation, degree of mitral regurgitation, mean pulmonary artery pressure, left atrial pressure, cardiac output, pulmonary vascular resistance, mitral valve gradient and mitral valve area. Fewer patients in Group 1 than Group 2 had an echocardiographic score less than or equal to 8 (62% versus 69%, respectively, p = 0.02). The atrial septum was dilated with an 8 mm balloon in 74% of patients in Group 1 and with a 5 mm balloon in all patients in Group 2. Ratio of effective balloon dilating area to body surface area was larger in Group 1 than in Group 2 (4.05 +/- 0.07 versus 3.7 +/- 0.03 cm2/m2, p = 0.0001). A good result (mitral valve area greater than or equal to 1.5 cm2) was obtained in 77% and 75% in Groups 1 and 2, respectively (p = NS). After percutaneous mitral valvuloplasty, a greater than or equal to 2 grade increase in mitral regurgitation was noted in 12% of Group 1 and 6% of Group 2 (p = 0.02) and a left to right shunt was detected in 22% of Group 1 and 11% of Group 2 (p = 0.0001). There were three procedure-related deaths in Group 1, but none in Group 2.(ABSTRACT TRUNCATED AT 250 WORDS)