1. Methemoglobin as a marker of acute anemic stress in cardiac surgery
- Author
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Nikhil Mistry, Gregory M.T. Hare, Nadine Shehata, Robert S. Kramer, Hosam F. Fawzy, Robert A. Baker, Paula Carmona, Richard Saczkowski, Daniela Filipescu, Christella S. Alphonsus, Antoine Rochon, Alexander J. Gregory, Boris Khanykin, Jonathan D. Leff, Eva Mateo, Dimos Karangelis, Juan C. Tellez, Tarit Saha, Dennis T. Ko, Duminda N. Wijeysundera, Subodh Verma, and C. David Mazer
- Subjects
Health sciences ,Surgery ,Cardiovascular medicine ,Public health ,Science - Abstract
Summary: Biological evidence supports plasma methemoglobin as a biomarker for anemia-induced tissue hypoxia. In this translational planned substudy of the multinational randomized controlled transfusion thresholds in cardiac surgery (TRICS-III) trial, which included adults undergoing cardiac surgery requiring cardiopulmonary bypass with a moderate-to-high risk of death, we investigated the relationship between perioperative hemoglobin concentration (Hb) and methemoglobin; and evaluated its association with postoperative outcomes. The primary endpoint was a composite of death, myocardial infarction, stroke, and severe acute kidney injury at 28 days. We observe weak non-linear associations between decreasing Hb and increasing methemoglobin, which were strongest in magnitude at the post-surgical time point. Increased levels of post-surgical methemoglobin were associated with a trend toward an elevated risk for stroke and exploratory neurological outcomes. Our generalizable study demonstrates post-surgical methemoglobin may be a marker of anemia-induced organ injury/dysfunction, and may have utility for guiding personalized approaches to anemia management. Clinicaltrials.gov registration NCT02042898.
- Published
- 2023
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