Mean age was 81 ± 5.6 years (16 male, 40.0%). Thirty-five patients underwent TA-TAVI and five patients TAo-TAVI. AKI developed in 17 patients (42.5%); seven patients (17.5%) suffered from AKI 3 and required renal replacement therapy (RRT). Mean maximum value of UTI within 24 hours after TAVI was significantly higher in patients with AKI compared with patients without renal impairment (2.19 ± 3.11 vs. 0.67 ± 0.816, P = 0.037) and higher in patients with AKI 3 compared with patients with AKI 2 (4.73 ± 3.58 vs. 0.59 ± 0.71, P = 0.022). In contrast, preoperative creatinine (AKI (mg/dl) 1.22 ± 0.41 vs. no AKI 1.30 ± 0.59; AKI 3 1.32 ± 0.49 vs. AKI 2 1.26 ± 0.53, P = NS) and early postoperative serum creatinine levels (maximum within 24 hours after TAVI: AKI 1.41 ± 0.50 vs. no AKI 1.34 ± 0.60; AKI 3 1.69 ± 0.56 vs. AKI 2 1.32 ± 0.54, P = NS) did not show any association with the development of AKI. ROC analyses revealed a very good predictive value of early UTI levels for the development of AKI 3 within the next 72 hours after TAVI with a sensitivity of 100% and a specificity of 80% for a cutoff value of 0.815 (AUC = 0.919, 95% CI = 0.824 to 1.0, SE 0.048, P = 0.001).