Right Ventricular Cardiac Power Index Predicts 1 Year Outcome After Transcatheter Edge-to-Edge-Repair for Severe Tricuspid Valve Regurgitation

Abstract

Tricuspid transcatheter edge-to-edge repair (T-TEER) for severe tricuspid regurgitation (TR) emerged as a novel treatment option for patients not amenable to surgery. However, knowledge regarding independent risk factors for a worse prognosis is rarely available. The study sought to investigate the impact of right ventricular cardiac power index (RVCPi) on 1-year outcomes in patients with severe symptomatic TR who underwent T-TEER. Consecutive patients with severe TR who underwent T-TEER from August 2020 to March 2022 were included and followed prospectively. Baseline clinical and invasive hemodynamic variables, changes in echocardiographic parameters and New York Heart Association functional class, and periprocedural and in-hospital major adverse events were assessed. Primary end point was defined as a composite of all-cause mortality and heart failure hospitalization at 1 year after T-TEER. A multivariable Cox proportional-hazards regression analysis was performed to identify independent risk factors for combined primary end point. RVCPi was calculated as: (cardiac index×mean pulmonary pressure)×K (conversion factor 2.22×10-3)=W/m². Receiver operator characteristic analysis was used to determine discriminative capacity of RVCPi. The prognostic value of RVCPi threshold was tested using Kaplan-Meier analysis. In total, 102 patients (mean age 81±6years, 51% women) at high operative risk underwent T-TEER for severe TR. Primary end point occurred in 30 patients (32%). Receiver operator characteristic curve analysis demonstrated that RVCPi was associated with an area under the curve of 0.69 (95% confidence interval 0.56 to 0.82; p=0.003). With a RVCPi threshold of 0.17W/m² (maximally selected rank statistics), the event-free survival was significantly higher in the RVCPi <0.17W/m² group compared with those with RVCPi ≥0.17W/m² (71% vs 35%, log-rank p<0.001). In the multivariable Cox regression analysis, RVCPi was an independent predictor for the combined primary end point (hazard ratio 2.6, 95% confidence interval 1.4 to 5.1, p=0.003). In conclusion, RVCPi is associated with outcome in patients who underwent T-TEER for severe TR and this hemodynamic predictor is useful in risk stratification of T-TEER candidates.