title: Correlation between brain interstitial and total serum cortisol levels in traumatic brain injury. A preliminary study.
abstract: BACKGROUND
  Brain cortisol availability has never been evaluated in patients with traumatic brain injury (TBI). Cerebral microdialysis is a well-established technique for monitoring brain metabolism in neurocritically ill patients, which may be used to measure interstitial cortisol. The objective of this preliminary study was to measure brain interstitial cortisol and its correlation with total serum cortisol in patients with TBI.
  
  
  METHODS
  We prospectively studied 6 patients with severe TBI admitted to the Intensive Care Unit of our tertiary University Hospital in which multimodal neuromonitoring including cerebral microdialysis with a high cut-off of 100 k-Da and 20-mm long membrane was used. Serum and brain interstitial cortisol microdialysis samples were obtained every 8 h and analyzed afterwards.
  
  
  RESULTS
  Linear regression analysis of total serum cortisol and brain interstitial cortisol in the whole population showed a moderate correlation (R2=0.538, p<0.001, no.=118). However, intra-individual correlation showed a great variability, with correlation coefficients ranging from a R2=0.091 to R2=0.680.
  
  
  CONCLUSIONS
  Our prospective and preliminary study showed a moderate correlation of brain interstitial cortisol and total serum cortisol values in patients with diffuse TBI. However, intra-individual analysis showed a great variability. These results suggest that total serum cortisol may not reflect brain cortisol availability in half of TBI patients.
authors.affiliation: Intensive Care Medicine Service, Son Dureta University Hospital, Palma de Mallorca, Spain. juanantonio.llompart@ssib.es
authors.forename: J A
authors.initials: JA
authors.lastname: Llompart-Pou
authors.forename: G
authors.initials: G
authors.lastname: Pérez
authors.forename: J
authors.initials: J
authors.lastname: Pérez-Bárcena
authors.forename: M
authors.initials: M
authors.lastname: Brell
authors.forename: J
authors.initials: J
authors.lastname: Ibáñez
authors.forename: M
authors.initials: M
authors.lastname: Riesco
authors.forename: J M
authors.initials: JM
authors.lastname: Abadal
authors.forename: J
authors.initials: J
authors.lastname: Homar
authors.forename: P
authors.initials: P
authors.lastname: Marsé
authors.forename: J
authors.initials: J
authors.lastname: Ibáñez
authors.forename: B
authors.initials: B
authors.lastname: Burguera
authors.forename: J M
authors.initials: JM
authors.lastname: Raurich
mesh_terms: D000293:Adolescent; D000328:Adult; D001921:Brain / Q000378:metabolism*; D001930:Brain Injuries / Q000097:blood / Q000378:metabolism*; D045604:Extracellular Fluid / Q000737:chemistry; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000097:blood* / Q000378:metabolism*; D007427:Intracranial Pressure / Q000502:physiology; D008297:Male; D017551:Microdialysis; D008875:Middle Aged; D011446:Prospective Studies
chemical_list: D006854:Hydrocortisone