Cardiothoracic & vascular anesthesia

Carboxyhemoglobin as Potential Biomarker for Cardiac Surgery Associated Acute Kidney Injury

J Cardiothorac Vasc AnesthPublished Retrospective cohort study

Main finding · CSA-AKIResult — go to the resultOdds ratio 1.45 95% CI 1.023–2.071

Authors' conclusion

CO-Hb ≥ 1.4% at ICU admission is an independent risk factor for CSA-AKI, which is easily obtainable and available on routine arterial blood gas measurements.

Study context

Population
Adult on-pump cardiac surgery patients, July 2014 to June 2022, tertiary university-affiliated hospital
Participants
1,698 patients
Exposure
Carboxyhemoglobin (CO-Hb) quartiles at intensive care unit (ICU) admission
Outcome
CSA-AKI
Methodological detailssingle-centre
  • Single-centre

Main finding

As reported in the abstract

Odds ratio

1.45

95% CI 1.023–2.071

P = 0.038

CO-Hb ≥ 1.4% vs CO-Hb < 1.0%
OR 1.45 (95% CI 1.023–2.071); P = 0.038

Observational data: associations, not effects.

Further findings

OutcomeCO-Hb ≥ 1.4%P value
Postoperative creatinine, CO-Hb ≥ 1.4% vs <1.4%Univariable analysis135 μmol/LP < 0.001
Postoperative RRT, CO-Hb ≥ 1.4% vs <1.4%Univariable analysis6.7%P < 0.001
AKI, CO-Hb ≥ 1.4% vs <1.4%Univariable analysisP < 0.001
Time to AKI or death, CO-Hb ≥ 1.4% vs <1.4%P < 0.001
  • Postoperative creatinine, CO-Hb ≥ 1.4% vs <1.4%: CO-Hb <1.4% 116 μmol/L
  • Postoperative RRT, CO-Hb ≥ 1.4% vs <1.4%: CO-Hb <1.4% 2.3%

AKI, CO-Hb ≥ 1.4% vs <1.4%

Higher AKI rate with CO-Hb ≥ 1.4%

Time to AKI or death, CO-Hb ≥ 1.4% vs <1.4%

Shorter time to AKI or death with CO-Hb ≥ 1.4%

Parts of this Brief are withheld: the automatic checks could not confirm them against the abstract.

Original publication

Carboxyhemoglobin as Potential Biomarker for Cardiac Surgery Associated Acute Kidney Injury. J Cardiothorac Vasc Anesth. Published 10 July 2024. doi:10.1053/j.jvca.2024.07.016

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