title: Variation of bispectral index under TIVA with propofol in a paediatric population.
abstract: BACKGROUND
  In this prospective observational study, we aim to explore the relationship between age and bispectral index (BIS) values at different plasma concentrations of propofol.
  
  
  METHODS
  Fifty children aged from 3 to 15 yr were included. Anaesthesia was induced using a target-controlled infusion of propofol with the Kataria pharmacokinetic model together with a bolus of remifentanil followed by a continuous infusion rate at 0.2 microg kg(-1) min(-1). Target plasma propofol concentration was initially stabilized to 6 microg ml(-1) and continued for 6 min. The target was then decreased and stabilized to 4 microg ml(-1) and then to 2 microg ml(-1). BIS values, plasma propofol concentration, and EEG were continuously recorded. In order to explore the relationship between variations in propofol concentration and the EEG bispectrum, we used a multiple correspondence analysis (MCA). Results are shown in median (range).
  
  
  RESULTS
  We found no statistical difference between BIS values with propofol 6 microg ml(-1) [23 (12-40)] and 4 microg ml(-1) [28 (9-67)]. At 2 microg ml(-1), BIS was significantly different [52 (24-71)], but a significant correlation between the age of children and BIS values was found (r2=0.66; P<0.01). There was little change in children's position between 6 and 4 microg ml(-1) in the structure model of the MCA. From 4 to 2 microg ml(-1), the position of children moved only on axis 2.
  
  
  CONCLUSIONS
  These results showed the difficulty to interpret BIS values because of the absence of significant change for higher plasma propofol concentration variation or because of the link with age for the lower plasma concentration.
authors: INSERM, U642, F-35000 Rennes, France. olivier.tirel@chu-rennes.fr
authors: O
authors: O
authors: Tirel
authors: E
authors: E
authors: Wodey
authors: R
authors: R
authors: Harris
authors: J Y
authors: JY
authors: Bansard
authors: C
authors: C
authors: Ecoffey
authors: L
authors: L
authors: Senhadji
mesh_terms: D000293:Adolescent; D000375:Aging / Q000502:physiology; D018686:Anesthetics, Intravenous / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects; D002648:Child; D002675:Child, Preschool; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D004569:Electroencephalography / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D016343:Monitoring, Intraoperative / Q000379:methods; D015742:Propofol / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology*; D011446:Prospective Studies
chemical_list: D018686:Anesthetics, Intravenous; D015742:Propofol