Impact of Pulmonary Disease on Clinical Outcomes in Patients Undergoing Mitral Valve Edge-to-Edge Repair

Pulmonary diseases (PD) are frequently associated with impaired cardiac function and the presence of mitral and tricuspid regurgitation (MR and TR).

The study aimed to clarify the impact of PD on clinical outcomes following mitral transcatheter edge-to-edge repair (M-TEER).

Of the 3,764 patients who underwent M-TEER, 3,666 were included in the analysis and stratified according to the absence or presence of PD before the procedure. The primary endpoint was all-cause mortality, evaluated using Kaplan-Meier analysis. Cardiovascular and non-cardiovascular mortality and HFH (HFH) were also assessed during a 4-year follow-up. Moreover, the prognostic impact of TR improvement after M-TEER was evaluated in patients with and without PD.

Of the 3,666 patients, 580 (15.8%) had PD, included fewer women, and exhibited greater frailty compared with those without PD. Within a median follow-up of 432 [314-826] days, all-cause mortality did not differ significantly between patients with PD and those without (150 [25.9%] vs. 682 [22.1%], Log rank P = 0.331). No significant differences were observed in the incidence of cardiovascular mortality, non-cardiovascular mortality, and HFH between the two groups. When stratified by PD status, residual significant TR after M-TEER was significantly associated with HFH both in patients with PD and without PD.

The intermediate-term prognosis after M-TEER was comparable between patients with and without PD. In patients with PD, MR was effectively reduced through minimally invasive M-TEER. However, appropriate management of TR after MTEER may be required to improve outcomes in this population.

OCEAN-Mitral registry (UMIN-ID: UMIN000023653).