The Prognostic Value of Pulmonary Hypertension in Patients with Mitral Regurgitation Undergoing Mitral Valve Transcatheter Edge-to-Edge Repair: A Systematic Review and Meta-Analysis

Background: Pulmonary hypertension (PH) is associated with the outcomes of mitral valve transcatheter edge-to-edge repair (M-TEER) in patients with severe mitral regurgitation (MR). However, the prognosis of baseline PH on MR patients after M-TEER has been controversial. This meta-analysis aimed to determine the prognostic value of PH with early and late outcomes after M-TEER with MitraClip. Methods: We systematically searched PubMed/MEDLINE, EMBASE, the Cochrane Central Register of Controlled Trials (CENTRAL) and Web of Science for studies. The results of the meta-analysis are summarized as the hazard ratio (HR), odds ratios (ORs) or mean difference (MD) and 95% confidence interval (CI). Results: A total of 20 publications were included in the systematic review, of which six were observational cohort studies including 5684 patients. The pooled incidence estimate of all-cause mortality was more common in severe PH than in patients who were non-PH. On pooled multivariate analysis, baseline PH was associated with late (≥1-year) all-cause mortality (HR = 1.61, 95% CI [1.23–2.11]) and the combined outcome of late HF rehospitalization and all-cause mortality (HR = 1.33, 95% CI [1.15–1.53]) after M-TEER. The level of SPAP significantly decreased after MitraClip in MR patients with PH (MD = −12.33 mmHg, 95% CI [−14.08–−10.58]). Conclusions: Baseline PH had a worse prognosis of early (≥30-day) cardiac mortality, late all-cause mortality as well as the composite outcome of HF rehospitalization and all-cause mortality after M-TEER compared to non-PH patients. Future studies are needed to prove these findings.