Factors Associated With Brain Tissue Oxygenation Changes After RBC Transfusion in Acute Brain Injury Patients
- PMID: 35132018
- DOI: 10.1097/CCM.0000000000005460
Factors Associated With Brain Tissue Oxygenation Changes After RBC Transfusion in Acute Brain Injury Patients
Abstract
Objectives: Anemia is common after acute brain injury and can be associated with brain tissue hypoxia. RBC transfusion (RBCT) can improve brain oxygenation; however, predictors of such improvement remain unknown. We aimed to identify the factors associated with PbtO2 increase (greater than 20% from baseline value) after RBCT, using a generalized mixed model.
Design: This is a multicentric retrospective cohort study (2012-2020).
Setting: This study was conducted in three European ICUs of University Hospitals located in Belgium, Switzerland, and Austria.
Patients: All patients with acute brain injury who were monitored with brain tissue oxygenation (PbtO2) catheters and received at least one RBCT.
Intervention: Patients received at least one RBCT. PbtO2 was recorded before, 1 hour, and 2 hours after RBCT.
Measurements and main results: We included 69 patients receiving a total of 109 RBCTs after a median of 9 days (5-13 d) after injury. Baseline hemoglobin (Hb) and PbtO2 were 7.9 g/dL [7.3-8.7 g/dL] and 21 mm Hg (16-26 mm Hg), respectively; 2 hours after RBCT, the median absolute Hb and PbtO2 increases from baseline were 1.2 g/dL [0.8-1.8 g/dL] (p = 0.001) and 3 mm Hg (0-6 mm Hg) (p = 0.001). A 20% increase in PbtO2 after RBCT was observed in 45 transfusions (41%). High heart rate (HR) and low PbtO2 at baseline were independently associated with a 20% increase in PbtO2 after RBCT. Baseline PbtO2 had an area under receiver operator characteristic of 0.73 (95% CI, 0.64-0.83) to predict PbtO2 increase; a PbtO2 of 20 mm Hg had a sensitivity of 58% and a specificity of 73% to predict PbtO2 increase after RBCT.
Conclusions: Lower PbtO2 values and high HR at baseline could predict a significant increase in brain oxygenation after RBCT.
Copyright © 2022 by the Society of Critical Care Medicine and Wolters Kluwer Health, Inc. All Rights Reserved.
Conflict of interest statement
The authors have disclosed that they do not have any potential conflicts of interest.
Comment in
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Cerebral Tissue Oxygenation Monitoring for Guiding RBC Transfusion in Neurocritical Patients.Crit Care Med. 2022 Aug 1;50(8):e688-e689. doi: 10.1097/CCM.0000000000005561. Epub 2022 Jul 11. Crit Care Med. 2022. PMID: 35838264 No abstract available.
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