Prognostic Value of Baseline Tricuspid Annular Plane Systolic Excursion to Pulmonary Artery Systolic Pressure Ratio in Mitral Transcatheter Edge-to-Edge Repair

Background: A surrogate of right ventricular-pulmonary arterial coupling, the ratio of tricuspid annular plane systolic excursion (TAPSE) to pulmonary artery systolic pressure (PASP) has been associated with outcomes across a wide range of cardiac pathologies and interventions. The aim of this study was to assess the prognostic significance of baseline TAPSE/PASP ratio in patients undergoing mitral transcatheter edge-to-edge repair.

Methods: This was a single-center, retrospective analysis encompassing 448 days (interquartile range, 86-958 days) of follow-up after 707 consecutive isolated, first-time mitral transcatheter edge-to-edge repair procedures. Stratified by the cohort's median TAPSE/PASP ratio of 0.37 mm/mm Hg, eligible cases were examined for the occurrence of all-cause mortality and heart failure hospitalization.

Results: Patients with low TAPSE/PASP ratios exhibited a greater prevalence of functional mitral regurgitation, a higher burden of comorbidities, and worse clinical and echocardiographic indices of cardiac function, as well as an attenuated rate of technical success. After the procedure, they experienced similar 1-month and 1-year improvement in mitral regurgitation grade and functional status but higher rates of death, heart failure hospitalizations, and the composite of both at all time points explored (1 year, 15.3% vs 7.6%, 20.7% vs 10.2%, and 32.3% vs 16.1%, respectively; P < .001 for all). Lower TAPSE/PASP ratio was independently associated with a higher risk for the 1-year combined end point of death or heart failure hospitalizations (hazard ratio, 2.84; 95% CI, 1.09-7.43; P = .033). A novel TAPSE/PASP-MitraScore risk model showed a better discriminative property than currently validated scores. Subgroup analysis produced similarly significant observations solely in patients with functional mitral regurgitation (n = 383 [54.2%]), which remained when using subgroup-specific medians of the baseline TAPSE/PASP ratio.

Conclusions: A low TAPSE/PASP ratio before mitral transcatheter edge-to-edge repair identifies higher risk patients and predicts a less favorable outcome after the procedure.