title: The Effect of Red Blood Cell Transfusion on Cerebral Autoregulation in Patients with Severe Traumatic Brain Injury.
abstract: BACKGROUND
  Red blood cell (RBC) transfusion is associated with inconsistent changes in brain tissue oxygenation (PbO2). Previous studies have failed to consider alterations in cerebral autoregulation. Our objective was to investigate the effect of RBC transfusion on cerebral autoregulation, as measured by pressure reactivity index (PRx).
  
  
  METHODS
  Retrospective analysis of 28 severe traumatic brain injury (TBI) patients from a prospective registry between 2007 and 2014. We recorded hemoglobin (Hb) concentration, intracranial pressure, PbO2, cerebral perfusion pressure, PRx, and cerebral lactate/pyruvate ratio for 6 h before and after RBC transfusion. We also recorded body temperature, PaO2, PCO2, pH, and fraction of inspired oxygen. Subgroups of normoxia (PbO2 >20 mmHg) and hypoxia (PbO2 <20 mmHg) prior to transfusion were defined a priori.
  
  
  RESULTS
  The median age was 36 years [interquartile range (IQR) 27-49], 32% were female. The median admission Glasgow Coma score was 5 (IQR 4-9) and injury severity score was 16 (IQR 9-21). Overall, mean Hb concentration [80 g/L (SD 7) to 89 g/L (SD 8), p < 0.001] and PbO2 increased [23.5 mmHg (SD 8) to 25.0 mmHg (SD 9), p = 0.033] following transfusion. PRx increased post-transfusion [0.028 (SD 0.29) to 0.11 (SD 0.24), p = 0.034], indicating worsening cerebrovascular pressure reactivity. In patients with mean PbO2 >20 mmHg pre-transfusion (n = 20), the PRx increased significantly [-0.052 (SD 0.24) to 0.079 (SD 0.22), p = 0.007] but did not change in patients with PbO2 <20 mmHg: PRx [0.22 (SD 0.34) to 0.18 (SD 0.30), p = 0.36].
  
  
  CONCLUSIONS
  RBC transfusion in severe TBI patients results in worsening PRx, indicating impaired cerebral autoregulation.
authors.affiliation: Division of Critical Care Medicine, Department of Medicine, Vancouver General Hospital, University of British Columbia, West 12th Avenue, Vancouver, BC, V5Z 1M9, Canada, mypindersekhon@gmail.com.
authors.forename: Mypinder S
authors.initials: MS
authors.lastname: Sekhon
authors.forename: Donald E
authors.initials: DE
authors.lastname: Griesdale
authors.forename: Marek
authors.initials: M
authors.lastname: Czosnyka
authors.forename: Joseph
authors.initials: J
authors.lastname: Donnelly
authors.forename: Xia
authors.initials: X
authors.lastname: Liu
authors.forename: Marcel J
authors.initials: MJ
authors.lastname: Aries
authors.forename: Chiara
authors.initials: C
authors.lastname: Robba
authors.forename: Andrea
authors.initials: A
authors.lastname: Lavinio
authors.forename: David K
authors.initials: DK
authors.lastname: Menon
authors.forename: Peter
authors.initials: P
authors.lastname: Smielewski
authors.forename: Arun K
authors.initials: AK
authors.lastname: Gupta
mesh_terms: D000328:Adult; D001930:Brain Injuries / Q000628:therapy*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D015331:Cohort Studies; D017707:Erythrocyte Transfusion / Q000009:adverse effects / Q000379:methods*; D005260:Female; D006706:Homeostasis / Q000502:physiology*; D006801:Humans; D007427:Intracranial Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D012042:Registries