Predictive value of admission D-dimer for contrast-induced acute kidney injury and poor outcomes after primary percutaneous coronary intervention.

Background: DD was found to be associated with acute myocardial infarction (AMI) and renal insufficiency. However, it is uncertain whether DD is an independent risk factor of CI-AKI in patients undergoing pPCI.

Methods: We prospectively enrolled 550 consecutive patients with STEMI undergoing pPCI between January 2012 and December 2016. The predictive value of admission DD for CI-AKI was assessed by receiver operating characteristic (ROC) and multivariable logistic regression analysis. CI-AKI was defined as an absolute serum creatinine increase ≥0.3 mg/dl or a relative increase in serum creatinine ≥50% within 48 h of contrast medium exposure.

Results: Overall, the incidence of CI-AKI was 13.1%. The ROC analysis showed that the cutoff point of DD was 0.69 μg/ml for predicting CI-AKI with a sensitivity of 77.8% and a specificity of 57.3%. The predictive value of DD was similar to the Mehran score for CI-AKI (AUC = 0.729 vs AUC = 0.722; p = 0.8298). Multivariate logistic regression analysis indicated that DD > 0.69 μg/ml was an independent predictor of CI-AKI (odds ratio [OR] = 3.37,95% CI:1.80-6.33, p < 0.0001). Furthermore, DD > 0.69 μg/ml was associated with an increased risk of long-term mortality during a mean follow-up period of 16 months (hazard ratio = 3.41, 95%CI:1.4-8.03, p = 0.005).

Conclusion: Admission DD > 0.69 μg/ml was a significant and independent predictor of CI-AKI and long-term mortality in patients undergoing pPCI.