Rama A Safadi, Alaa Dean A Esmail, Lauren E DeProfio, Ahmed Adham R Elsayed, Marc D Basson
Although TEER remains the safer option in appropriately selected patients, TMVR offers greater efficacy in MR resolution at the cost of higher procedural risk. However, findings should be interpreted with caution, given that patient selection between TMVR and TEER patients may influence observed outcomes.
BACKGROUND: Mitral regurgitation affects 2% of the population globally, with a widely increasing prevalence. Although mitral regurgitation is most commonly corrected by open surgery, there has been a recent shift toward less invasive transcatheter approaches, including both transcatheter edge-to-edge repair (TEER) and transcatheter mitral valve replacement (TMVR).
METHODS: A comprehensive literature search was conducted using four databases: PubMed, Cochrane Library, Virtual Health Library (VHL), and Web of Science (WOS), following the PRISMA guidelines. Relevant observational studies were assessed for reporting using STROBE guidelines, whereas case reports were assessed using CARE guidelines. Independent reviewers evaluated studies based on eligibility criteria and analyzed relevant studies.
RESULTS: Postoperative complications observed in patients undergoing either technique (TMVR or TEER) included acute kidney injury, stroke, access site complications, and postoperative bleeding. These complications were generally more frequent in patients after TMVR. Myocardial infarction, prosthesis malposition, and valve migration were reported exclusively after TMVR, whereas ischemic cardiomyopathy was associated with TEER. Regarding hemodynamic outcomes, TMVR patients were associated with greater MR reduction to ≤ 1, frequently observed complete MR resolution, near-laminar blood flow, and marked improvement in left ventricular function (assessed using LVEDVI and LVESVI). TMVR was associated with significantly higher 30-day mortality, whereas pooled 1-year mortality did not differ significantly between TMVR and TEER.
CONCLUSION: Although TEER remains the safer option in appropriately selected patients, TMVR offers greater efficacy in MR resolution at the cost of higher procedural risk. However, findings should be interpreted with caution, given that patient selection between TMVR and TEER patients may influence observed outcomes.