Ankle-brachial pressure index as a predictor of the 2-year outcome after transcatheter aortic valve replacement: data from the Japanese OCEAN-TAVI Registry.

Abstract

Peripheral artery disease plays a pivotal role for access site selection in transcatheter aortic valve replacement (TAVR). Abnormal ankle-brachial index (ABI) is a generalized mortality marker in many cardiovascular scenarios. However, the long-term outcomes in high-risk TAVR populations remain unclear. We investigated the association between low ABI and 2-year outcome after TAVR. Of 1613 patients enrolled in the OCEAN-TAVI registry, 1458 (90.4%) who underwent ABI before TAVR were divided into groups: patients with (1) ABI≥0.9 in both legs and (2) ABI<0.9 in either leg. Primary endpoint was all-cause death within 2years. ABI<0.9 was noted in 304 patients (20.8%). ABI<0.9-group had more frequent and severe comorbidities. Primary endpoint in ABI<0.9-group was significantly higher than that in ABI≥0.9-group (15.8 vs. 8.7%, p<0.001). This trend continued in the transfemoral (TF)-approach (14.9 vs. 7.5%, p<0.001), but not in the alternative approach (17.2 vs. 15.8%, p=0.815). Within 30days, ABI<0.9-group had a higher cardiac death rate (3.1 vs. 1.0%, p=0.033), whereas between 31days and 2years, non-cardiovascular death was more frequently observed (9.2 vs. 5.1%, p=0.003). In ABI<0.9-group, in-hospital vascular complications (11.9 vs. 4.9%, p<0.001) and acute kidney injury (10.8 vs, 5.7%, p=0.009) were more frequently found when using the transfemoral-approach. In multivariate analysis, ABI<0.9 was an independent predictor of 2-year mortality (adjusted hazard ratio 1.495, 95% CI 1.007-2.220, p=0.046). Pre-procedure ABI<0.9 is a useful prognostic marker for all-cause mortality, even in high-risk TAVR populations.