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Acute Kidney Injury after Isolated Coronary Bypass Surgery.

John C Slaughter1, Daniel L Davenport2, Sibu P Saha3

  • 1University of Kentucky College of Medicine, Lexington, Kentucky.

The International Journal of Angiology : Official Publication of the International College of Angiology, Inc
|February 13, 2025
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Summary

Acute kidney injury (AKI) after cardiac surgery is a serious complication. This study found chronic lung disease and blood transfusions increase AKI risk, with lower rates than national averages.

Keywords:
acute kidney injuryacute kidney insufficiencycardiac surgerycardiac surgery associated AKIcoronary artery bypass graftingrenal failuresociety of thoracic surgeons database

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Area of Science:

  • Nephrology
  • Cardiology
  • Critical Care Medicine

Background:

  • Acute kidney injury (AKI) is a significant postoperative complication following cardiac surgery, increasing patient morbidity and mortality.
  • Comparing institutional AKI rates to national benchmarks is crucial for quality improvement.

Purpose of the Study:

  • To identify risk factors associated with AKI after coronary artery bypass grafting (CABG).
  • To compare the institution's AKI incidence in CABG patients with national averages reported by the Society of Thoracic Surgeons (STS).

Main Methods:

  • Retrospective review of 1,068 CABG patients from January 2020 to June 2023.
  • Analysis of patient demographics, nonmodifiable conditions, and modifiable risk factors.
  • Utilized the STS definition for renal failure (Risk, Injury, Failure, Loss, End-stage renal disease).

Main Results:

  • The institutional AKI rate was 1.3% (14 patients), lower than the national average of 1.9% for isolated CABG in 2023.
  • Chronic lung disease and lower preoperative ejection fraction were significant risk factors for AKI.
  • Perioperative blood transfusion, increased perfusion and cross-clamp times were identified as modifiable risk factors.
  • AKI patients experienced longer ventilator times, hospital stays, and increased postoperative mortality.

Conclusions:

  • The institution's AKI rate after CABG is favorable compared to national data.
  • Chronic lung disease and perioperative blood transfusions are key risk factors for AKI in this patient population.
  • Addressing modifiable factors like transfusion management and optimizing surgical times may reduce AKI incidence and improve outcomes.