A preprocedural risk score predicts acute kidney injury following primary percutaneous coronary intervention

Area of Science:

• Cardiology
• Nephrology
• Interventional Cardiology

Background:

• Lack of reliable preprocedural risk scores for Contrast-Induced Acute Kidney Injury (CI-AKI) following Percutaneous Coronary Intervention (pPCI) in ST-elevation Myocardial Infarction (STEMI) patients.
• Need for a validated tool to predict CI-AKI risk before pPCI in STEMI patients.

Purpose of the Study:

• To derive and validate a preprocedural risk score for predicting CI-AKI in STEMI patients undergoing pPCI.
• To identify key predictors of CI-AKI in this patient population.

Main Methods:

• Utilized two prospectively enrolled patient cohorts (n=3,736) for risk score derivation and validation.
• Defined CI-AKI as a creatinine increase ≥0.5 mg/dl within 72 hours post-pPCI.
• Developed the Risk Score by converting odds ratios from a multivariable logistic regression model into integer points.

Main Results:

• Identified independent CI-AKI predictors: diabetes, Killip class II-III (2 points each), age >75 years, anterior MI (3 points), Killip class IV (4 points), and eGFR <60 ml/min/1.73m² (5 points).
• The Risk Score demonstrated strong predictive accuracy with a c-statistic of 0.84 in both derivation and validation cohorts.
• Patients with higher Risk Scores exhibited significantly increased relative risks of CI-AKI (e.g., ≥10 points associated with a ~20-fold increased risk).

Conclusions:

• A simple preprocedural Risk Score accurately and reproducibly predicts CI-AKI risk in STEMI patients undergoing pPCI.
• The score identifies a substantial proportion of patients at significantly elevated risk (e.g., 1/10 with a 20-fold risk).
• This tool can guide tailored management strategies, potentially including delaying non-culprit revascularization in high-risk individuals.