Nephrotoxicity of gadolinium-based contrast in the setting of renal artery intervention: retrospective analysis with 10-year follow-up

PURPOSE We aimed to determine the incidence rate and potential risk factors for postcontrast acute kidney injury (PC-AKI) as well as the long-term clinical implications on dialysis and mortality in patients with chronic kidney disease (CKD) who under went renal artery stent placement exclusively with gadolinium-based contrast agents. METHODS This retrospective study reviewed 412 patients with CKD who underwent renal artery stent placement. Sixty-eight patients underwent intervention exclusively with gadolinium-based contrast agents and were analyzed. Criteria for PC-AKI included either an absolute serum creatinine increase >0.3 mg/dL or percentage increase in serum creatinine >50% within 48 hours of intervention. Logistic regression analysis was performed to identify risk factors for PC-AKI. The cumulative proportion of patients who died or went on to hemodialysis was determined Using Kaplan-Meier survival analysis. RESULTS The incidence of PC-AKI was 14.7%. The rate of AKI decreased for every 1 unit increase in glomertilar filtration rate ( GFR, odds ratio [OR]=0.91, P= 0.047). Prehydration was associated with a lower PC-AKI rate (OR=0.17; P = 0.015). Acute kidney injury after intervention was associated with an increased rate of dialysis (Hazard ratio [HR]=4.51, P = 0.002) and mortality (HR=2.52; P= 0.027). CONCLUSION Gadolinium-based contrast gents are potentially nephrotoxic when used for endovascular intervention in patients with CKD. The risk of PC-AKI increased with lower GFR and decreased prehydration. Dialysis and mortality risk were increased in patients who developed PC-AKI.