Reduced Pulmonary Artery Compliance in a Conscious State Predicts Cardiac Event After Transcatheter Edge-to-Edge Repair in Patients With Ventricular Secondary Mitral Regurgitation.

Background: Right ventricular (RV) dysfunction negatively affects mitral valve transcatheter edge-to-edge repair (M-TEER) outcomes in patients with ventricular secondary mitral regurgitation (vSMR). However, RV dysfunction occurs in the late phase of heart failure, when it may not respond to interventions. The pulsatile component of RV afterload, pulmonary artery (PA) compliance, is a sensitive parameter that decreases before RV dysfunction occurs. We explored the utility of PA compliance in predicting cardiac events after M-TEER.

Methods And Results: We analyzed 107 patients with vSMR who underwent M-TEER and in whom right heart catheter parameters were measured in a conscious state. Twenty-four patients had a cardiac event. There were no differences in patient characteristics or echocardiographic parameters between groups with and without cardiac events. PA compliance was significantly reduced in the event group, but other RV function parameters did not differ between the 2 groups. Receiver operating characteristic curve analysis revealed an optimal prognostic cut-off value for PA compliance of 2.7 mL/mmHg. In multivariate Cox regression, reduced PA compliance (<2.7 mL/mmHg) was strongly associated with cardiac events. Kaplan-Meier analysis revealed PA compliance had significant prognostic power for the composite outcome of cardiac events (log-rank P<0.01).

Conclusions: Reduced PA compliance (hemodynamically derived in the conscious state) was a strong prognostic indicator in patients with vSMR who underwent M-TEER.