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Aim  We aimed to examine the relationship between kidney size and contrast‐induced nephropathy ( CIN ) in patients who underwent contrast‐enhanced computed tomography ( CT ) in the emergency department.    Methods  This single‐center retrospective observational study was undertaken to evaluate risk factors for  CIN  at Okayama Saiseikai General Hospital (Okayama, Japan) from January 2014 through to December 2016. Contrast‐induced nephropathy was defined as an absolute increase in serum creatinine level of ≥0.5 mg/dL or ≥25% over the baseline value within 72 h after contrast‐enhanced  CT . Independent risk factors for  CIN  were determined by multiple logistic regression analysis. The thickness of the kidney was evaluated as a predictor of  CIN  using the area under the receiver operating characteristic curve. We also analyzed  CIN  as an outcome using the Kaplan–Meier method.    Results  The incidence of  CIN  was 26/262 (9.9%). In the multivariate analysis,  CIN  was associated with renal thickness (odds ratio = 0.65; 95% confidence interval, 0.53–0.81). No patient underwent renal replacement therapy.    Conclusion  Renal thickness could be used as a reliable, simple, and easily obtainable marker for identifying  CIN  in patients undergoing contrast‐enhanced  CT  in the emergency department.

Using kidney size for early detection of contrast‐induced nephropathy in the emergency department setting