62 Prognostic implication of contrast induced acute kidney injury – a five year mortality review

Introduction Contrast induced acute kidney injury (CI-AKI), defined as a delta rise in creatinine of >26.5 umol/L or a 50% relative rise within 48 hours following iodinated contrast, is associated with considerable mortality risk. Our previous study of 301 patients undergoing contrast coronary angiography/percutaneous coronary intervention (PCI) highlighted a CI-AKI rate of 9.3% at index procedure. Few studies have looked at long term prognosis, adverse events and mortality following CI-AKI. Our objective is to assess the 5 year mortality rate following contrast coronary angiography and to evaluate independent risk factors and presence of index CI-AKI on 5 year mortality. Methods A prospective cohort study in a single cardiology centre in the UK was carried out from 2011–2013, the results of which have been previously published.1 In total 2,519 patients were screened, 321 (12.7%) of which had CKD, in total 301 (93.7%) patients were recruited. Written consent was obtained from all patients. Patient demographics, CI-AKI risk factors, CKD stage and contrast dose at initial contrast angiography were recorded. A Mehran risk score was calculated for each patient. Samples for plasma NGAL, serum L-FABP, serum KIM-1, serum IL-18 and serum creatinine were previously collected pre and post contrast angiography and statistically analysed to assess prediction of CI-AKI as previously described. 1 At 5 years following index contrast procedure we analysed for MACE and mortality by accessing up to date electronic medical records. Patient consent was granted to access medical notes. Statistical analysis was performed to assess the predicative ability of CI-AKI risk factors and Mehran risk score on 5 year mortality risk. Results At 5 years follow up data was available for 292 (97%) of the original 301 patients. Type 2 diabetes, contrast volume, Mehran risk score, lower glomerular filtration rate (GFR) and use of intravenous fluids at index procedure were independently associated with five year mortality, p At 5 year follow up 76 (26.0%) of the total cohort of patient had died. Out of the 28 patients who developed CI-AKI at index contrast procedure 17 (60.7%) of the 28 patients had died at 5 years versus 58 (22.0%) of the 264 non CI-AKI patients (p Conclusion This study highlights that index CI-AKI is an independent risk factor for 5 year mortality and MACE. Several risk factors act independently as surrogate markers of CI-AKI prior to administration of iodinated contrast, many of which are incorporated in the Mehran CI-AKI risk score. Furthermore, these are associated with adverse incidents and mortality at five years following index contrast procedure. A combination approach of these findings, including novel biomarkers as previously demonstrated, will help to reduce risk and early identify CI-AKI to facilitate timely therapeutic intervention. Reference Connolly M, Kinnin M, McEneaney D, Menown I, Kurth M, Lamont J, et al . Prediction of contrast induced acute kidney injury using novel biomarkers following contrast coronary angiography. Quarterly Journal of Medicine - An International Journal of Medicine 2018:103–110. Conflict of Interest n/a