A Comparison Between Two Different Definitions of Contrast-Associated Acute Kidney Injury for Long-Term Mortality in...

Area of Science:

• Nephrology
• Cardiology
• Clinical Research

Background:

• Contrast-associated acute kidney injury (CA-AKI) is a known complication after coronary angiography (CAG).
• Definitions of CA-AKI remain debated, with limited research on their prognostic impact in chronic kidney disease (CKD) patients.
• Understanding CA-AKI definition impact is crucial for managing high-risk patients.

Purpose of the Study:

• To evaluate the association between two distinct CA-AKI definitions and long-term mortality in CKD patients undergoing CAG.
• To compare the prognostic impact of different CA-AKI diagnostic criteria.
• To calculate population attributable risks (PARs) for CA-AKI definitions.

Main Methods:

• A cohort of 4197 CKD patients undergoing CAG was analyzed.
• Two CA-AKI definitions were applied: CA-AKI_A (≥0.5 mg/dL or >25% SCr increase within 72h) and CA-AKI_B (≥0.3 mg/dL or >50% SCr increase within 48h).
• Cox regression and PARs were used to assess long-term mortality associations.

Main Results:

• Long-term mortality was 23.6% over a median follow-up of 4.70 years.
• Both CA-AKI_A (HR 1.45) and CA-AKI_B (HR 1.44) were significantly associated with increased long-term mortality (p<0.001).
• Population attributable risks were substantial for both definitions (CA-AKI_A: 5.87%, CA-AKI_B: 5.70%).

Conclusions:

• Both CA-AKI definitions are significantly correlated with poor long-term prognosis in CKD patients post-CAG.
• Clinical management should prioritize CA-AKI detection and prevention, irrespective of the specific definition used.
• These findings highlight the clinical significance of CA-AKI in CKD patients undergoing invasive cardiac procedures.