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Background and Aims Transcatheter aortic valve implantation (TAVI) is indicated for the treatment of patients with severe aortic stenosis with a high surgical risk that are rejected for surgical valve placement. The aim of this study is to evaluate the effect of TAVI on long-term kidney function in stage 3-4 chronic kidney disease (CKD) patients. Method We performed a single-center retrospective observational study of 529 consecutive patients that underwent TAVI between August 2007 and January 2018. We included patients with stage 3 or 4 CKD, with at least two stable measurements of glomerular filtration rate during the three months before TAVI. We excluded patients that presented with an acute kidney injury during the three months that preceded TAVI. Results 165 patients (31.3%) of the patients who underwent TAVI had a stable stage 3 or 4 CKD before implantation. Their mean age was 83.61 ±5.08 years, BMI of 27.79 ± 4.54 kg/m2, baseline serum creatinine of 1.62 ± 0.49 mg/dl for an eGFR measured by MDRD-4 of 40.19 ± 10.79 ml/min, EuroScore-II of 6 (IQR 4-8). 42 patients (28.6%) had a post-procedural acute kidney injury (AKI), 2 of them required temporary renal replacement therapy and 30 patients (71.4%) recovered to their baseline kidney function. Mean contrast media administered was 162.0 ±77.8 ml. Mean serum creatinine decreased from 1.64 ± 0.51 mg/dl to 1.46 ± 0.52 ml/min after 1 year of follow-up (p=0.032). Only 2.4% of patients showed a &amp;gt;50% increase in serum creatinine after 1 year. Median follow-up was 3.8 years (IQR 2.3-5.7 years) during which time no patient progressed to end-stage kidney disease. 33.3 % of patients died during follow-up, with a one-year survival rate of 87% and two-year survival of 82%. Post-interventional major bleeding (14.6 vs 5.8%, p&amp;lt;0.001) and the need for post-interventional pacemaker implantation (25 vs 13.3%, p&amp;lt;0,001)were the only risk factors associated with the development of AKI. Contrast volume was not associated with the development of AKI. AKI was associated with an increased in-hospital stay (13.2 vs 7.4 days, p&amp;lt;0.001), but was not associated with either a reduced kidney function at end of follow-up or an increased mortality (Log-rank X2=1.72, p=0,578). Conclusion Despite the high incidence of post-interventional AKI after TAVI, our study did not show an association between AKI and increased mortality or reduced renal survival. In most cases after AKI patients recovered to their baseline kidney function. There is an improvement in kidney function after one year of treatment of severe aortic stenosis with TAVI in patients with CKD Stage 3-4.

P0709RENAL OUTCOMES AND MORTALITY FOLLOWING TRANSCATHETER AORTIC VALVE IMPLANTATION IN CHRONIC KIDNEY DISEASE PATIENTS