Objective:

To evaluate the changes in left ventricular diameters and hemodynamics across different mitral regurgitation mechanisms following mitral transcatheter edge-to-edge repair (M-TEER).

Approach:

• Study Design: The study evaluated 442 patients assessed for M-TEER between 2014 and 2024, with 411 receiving at least one clip. Pre- and post-procedural echocardiograms were reviewed.
• Data Collection: Clinical data were abstracted from medical records, and mitral regurgitation mechanisms were classified using intraprocedural imaging findings.
• Outcome Measures: Outcomes included changes in left ventricular end-diastolic diameter, end-systolic diameter, and pulmonary artery systolic pressure.

Key Findings:

• Average change in mitral regurgitation grade was −2.42 at 1 month, with a median change of −3 grades.
• No statistically significant differences in LV diameter changes across mitral regurgitation subtypes.
• Median changes in LV end-diastolic diameter were −0.20 cm (atrial), −0.10 cm (ventricular), and −0.10 cm (degenerative).
• Median changes in LV end-systolic diameter were 0.20 cm (atrial), −0.10 cm (ventricular), and 0.05 cm (degenerative).
• Pulmonary artery systolic pressure changes varied by subtype: 4 mmHg (atrial), −5.5 mmHg (ventricular), and −3 mmHg (degenerative).

Interpretation:

1-month LV dimensional remodeling following M-TEER was modest and similar across mitral regurgitation mechanisms, while pulmonary artery systolic pressure responses varied by subtype.

Limitations:

• No disclosure information was provided.
• The study did not include long-term follow-up data.

Conclusion:

The findings suggest that while LV dimensional changes post-M-TEER are modest and similar across mechanisms, pulmonary artery systolic pressure responses differ.

Sources:

• Journal of the American Society of Echocardiography