Contrast-induced acute kidney injury following coronary angiography in patients with end-stage liver disease

Background: Contrast-induced acute kidney injury (CIAKI) following coronary angiography is frequently observed in the general population. End-stage liver disease (ESLD) patients are at a particularly increased risk for development of CIAKI following coronary angiography due to preexisting renal hypoperfusion. Methods: We performed a retrospective study of 544 consecutive cardiac catheterizations in ESLD patients from December 2003 to May 2013 to calculate the incidence of CIAKI post-coronary angiography and to identify risk factors for CIAKI. CIAKI was defined as a serum creatinine increase of either ≥ 25% or ≥ 0.5 mg/dL from baseline within 72 hours. Multivariable and Cox regression analysis was performed for development of CIAKI and all-cause mortality, respectively. Results: Overall, 179 cases of coronary angiography were included in the final analysis. CIAKI occurred in 23% of patients. All-cause mortality was 52% in the CIAKI group and 37% in the non-CIAKI group, with a mean follow-up of 2.2 ± 3.8 years. Multivariable analysis identified intensive care unit admission (OR 2.72, CI 1.05–7.01, p < 0.05) and baseline estimated glomerular filtration rate (OR 1.02, CI 1.002–1.035, p < 0.05) as independent predictors of CIAKI. Cox regression analysis identified pre-angiography beta-blocker use (HR 2.13, CI 1.04–4.38, p < 0.05), international normalized ratio (HR 1.37, CI 1.05–1.78, p < 0.05) and Mehran risk score (HR 1.13, CI 1.02–1.25, p < 0.05) as independent predictors of all-cause mortality. Conclusions: CIAKI in ESLD patients undergoing coronary angiography occurs at a moderately elevated rate when compared to the general population.