Transcatheter edge-to-edge repair vs medical therapy in atrial functional mitral regurgitation: a propensity score-based comparison from the OCEAN-Mitral and REVEAL-AFMR registries
Tomohiro Kaneko, Nobuyuki Kagiyama, Shinya Okazaki, Masashi Amano, Yukio Satô, Yohei Ohno, Masaru Obokata, Kimi Sato, Kojiro Morita, Shunsuke Kubo, Yuki Izumi, Masahiko Asami, Yusuke Enta, Shinichi Shirai, Masaki Izumo, Shingo Mizuno, Yusuke Watanabe, Makoto Amaki, Kazuhisa Kodama, Hisao Otsuki, Toru Naganuma, Hiroki Bota, Masahiro Yamawaki, Hiroshi Ueno, Gaku Nakazawa, Daisuke Hachinohe, Toshiaki Otsuka, Mike Saji, Masanori Yamamoto, Kentaro Hayashida
Abstract
BACKGROUND AND AIMS: Atrial functional mitral regurgitation (AFMR) commonly affects elderly and frail individuals. The prognostic impact of transcatheter edge-to-edge repair (TEER) for AFMR has not been investigated. METHODS: Patients with AFMR who underwent TEER were selected from the OCEAN-Mitral registry, and medically managed controls were selected from the REVEAL-AFMR registry, using an identical AFMR definition. The primary endpoint was a composite of all-cause mortality and heart failure hospitalization. The secondary endpoint was all-cause mortality. RESULTS: A total of 1081 patients (mean age 80.1 ± 8.2 years, 60.5% female) with moderate or severe AFMR were included, of whom 441 underwent TEER and 640 remained on medical treatment. Overlap weighting based on the propensity score yielded well-balanced characteristics (n = 441 vs 640; all standardized mean differences <0.01), where TEER was associated with a lower incidence of the primary (hazard ratio [HR] 0.65, 95% confidence interval [CI] 0.43-0.99, P = .044) and secondary endpoints (HR 0.58, 95% CI 0.35-0.99, P = .044). In an exploratory subgroup analysis, favourable outcomes might be pronounced in patients with ≤mild residual AFMR after TEER, while event rates in those with ≥ moderate residual AFMR were comparable with the medication group. As sensitivity analyses, inverse probability of treatment weighting (n = 158 vs 173), propensity score matching (n = 104 vs 104), and multivariable Cox regression (n = 441 vs. 640) all confirmed favourable associations of TEER with both endpoints. CONCLUSIONS: In real-world data, TEER for patients with moderate or severe AFMR were associated with a lower incidence of adverse events compared with medical treatment.