Heart valve repair success increasingly depends on understanding which patients will thrive long-term, not just survive the procedure itself. This reality becomes especially critical as transcatheter interventions expand to older, sicker populations who might not tolerate traditional surgery. A comprehensive analysis of 367 patients undergoing transcatheter edge-to-edge repair for degenerative mitral regurgitation reveals that left atrial strain measurements before the procedure powerfully predict one-year outcomes, offering clinicians a new tool for patient selection and counseling. Patients with below-median left atrial strain (under 18.5%) at baseline faced significantly higher risks of death and heart failure hospitalization within the first year, with hazard ratios exceeding 2.0 in some analyses. These high-risk patients also presented more frequently with acute heart failure, hemodynamic instability, and atrial fibrillation, suggesting that compromised atrial function reflects broader cardiovascular deterioration. Notably, the procedure itself succeeded equally well across all patient groups, with over 97% technical success rates regardless of baseline atrial function. This finding challenges the assumption that procedural success translates uniformly to clinical benefit. The research adds to growing evidence that cardiac imaging parameters beyond traditional ejection fraction metrics provide superior prognostic insight. Left atrial strain, which measures the heart's upper chamber flexibility and pumping efficiency, appears particularly valuable because atrial dysfunction often precedes ventricular changes in degenerative valve disease. For interventional cardiologists, these findings suggest incorporating atrial strain assessment into standard pre-procedural evaluations could significantly improve patient selection and outcome prediction in this rapidly expanding field.