Revising the Maximal Contrast Dose for Predicting Acute Kidney Injury following Coronary Intervention

Area of Science:

• Nephrology
• Cardiology
• Radiology

Background:

• Contrast-induced acute kidney injury (CI-AKI) is a risk following percutaneous coronary interventions (PCIs).
• The maximal allowable contrast dose (MACD) equation, using a factor K of 5, is used to mitigate CI-AKI risk.
• The empirical nature of factor K has not been previously challenged.

Purpose of the Study:

• To refine the MACD equation for predicting CI-AKI after PCIs.
• To determine an optimal coefficient for the MACD equation to improve CI-AKI prediction.
• To assess the predictive performance of the factor K in CI-AKI development.

Main Methods:

• Retrospective cohort study of 3,506 adult patients undergoing PCI.
• Calculation of factor K (contrast volume × serum creatinine/body weight) for all patients.
• Receiver operating characteristic (ROC) curve analysis to identify the optimal cut-off for factor K in predicting severe CI-AKI.

Main Results:

• 7.2% of patients developed CI-AKI; 26.7% of those had severe CI-AKI.
• Factor K showed better prediction for severe CI-AKI (AUC 0.736) than all-stage CI-AKI (AUC 0.649).
• An optimal cut-off value of 2.5 for factor K predicted severe CI-AKI with 68.7% sensitivity and 70.5% specificity.

Conclusions:

• Factor K is an independent risk factor for severe CI-AKI post-PCI.
• The optimal cut-off value for factor K in predicting severe CI-AKI is 2.5.
• The MACD equation may require revision, replacing the coefficient 5 with 2.5 for improved CI-AKI risk prediction.