Cardiothoracic & vascular anesthesia

Center-mediated Differences in Postoperative Acute Kidney Injury Rates: A Post Hoc Analysis of the PROTECTION Trial

J Cardiothorac Vasc AnesthPublished Post hoc analysis of the PROTECTION randomised trial

Primary result · CSA-AKI with AA, corrected for center effectResult — go to the resultRelative risk 0.79

Authors' conclusion

Taking into account such center effects, however, AA therapy remained independently associated with CSA-AKI prevention.

Study context

Population
Adults undergoing cardiac surgery enrolled in the PROTECTION trial
Comparison
High-rate centers vs low-rate centers of cardiac surgery-associated acute kidney injury (CSA-AKI); Amino acid (AA) vs no AA corrected for center effect
Primary endpoint
Cardiac surgery-associated AKI (CSA-AKI)
Methodological detailsmulticentre
  • Multicentre

Primary result

CSA-AKI with AA, corrected for center effect

Relative risk

0.79

As reported in the abstract

Further findings

Preoperative patient characteristics, HR-C vs low-rate centers

HR-C patients older, lower LV ejection fraction and hemoglobin, more NYHA class III–IV, hypertension, previous MI, DM, peripheral vascular disease, more myocardial revascularization
P = 0.001

Intraoperative management, HR-C vs low-rate centers

HR-C: longer aortic cross-clamp time, higher temperature on CPB, less diuretics and hemofiltration, more norepinephrine

Original publication

Center-mediated Differences in Postoperative Acute Kidney Injury Rates: A Post Hoc Analysis of the PROTECTION Trial. J Cardiothorac Vasc Anesth. Published 22 October 2025. doi:10.1053/j.jvca.2025.10.022

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