Aims: The aim of this systematic review and meta-analysis was to investigate the predictors and outcome of acute kidney injury (AKI) after transcatheter aortic valve implantation (TAVI).
Methods and results: There were 35 articles recruiting 13,256 patients included in our study. Hypertension (odds ratio [OR] 1.92, 95% CI: 1.44 to 2.56), diabetes mellitus (OR 1.33, 95% CI: 1.20 to 1.47), peripheral artery disease (OR 1.28, 95% CI: 1.14 to 1.45) and a left ventricular ejection fraction <40% (OR 1.50, 95% CI: 1.19 to 1.88) were identified as significant independent predictors of AKI. In addition to the aforementioned comorbidities, procedure-related/post-TAVI factors such as transapical access (OR 1.68, 95% CI: 1.44 to 1.97), major bleeding (OR 1.82, 95% CI: 1.37 to 2.40) and transfusion (OR 1.30, 95% CI: 1.12 to 1.51) were also associated with a higher risk of AKI. Importantly, the risk of short-term all-cause death increased progressively with the aggravating severity of AKI (OR, 30 days: stage 1: 3.41; stage 2: 4.0; stage 3: 11.02; one year: stage 1: 1.95; stage 2: 2.82; stage 3: 7.34), as determined by a univariate analysis. After eliminating confounders, AKI remained linked to a higher risk for both short-term (30 days: HR 2.12, 95% CI: 1.59 to 2.83) and long-term (≥3 years: HR 1.37, 95% CI: 1.27 to 1.48) all-cause mortality.
Conclusions: The reason for the occurrence of AKI was multifactorial, including baseline characteristics, procedure-related and post-TAVI factors. It appeared that even stage 1 AKI exerted detrimental effects on survival within one year, and AKI was also independently linked to mortality beyond three years.