title: A comparison of frontal and occipital bispectral index values obtained during neurosurgical procedures.
abstract: We placed bispectral index (BIS) sensors on the frontal and occipital areas of neurosurgical patients and compared BIS values obtained from both areas during propofol/fentanyl anesthesia. BIS showed a strong correlation between frontal and occipital montages (r(2) = 0.96; P = 0.03). It may be valid to measure BIS with the sensor on the occipital area if required during frontal neurosurgical procedures.
  
  
  CONCLUSIONS
  Bispectral values were positively correlated when recorded from frontal and occipital sensors in patients undergoing clipping of unruptured cerebral aneurysms while anesthetized with propofol and fentanyl.
authors.affiliation: Department of Anesthesiology, Tokyo Medical University Hachioji Medical Center, Tokyo, Japan.
authors.forename: Toshie
authors.initials: T
authors.lastname: Shiraishi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Uchino
authors.forename: Takeshi
authors.initials: T
authors.lastname: Sagara
authors.forename: Nagao
authors.initials: N
authors.lastname: Ishii
mesh_terms: D000328:Adult; D000368:Aged; D004569:Electroencephalography / Q000295:instrumentation / Q000379:methods*; D005260:Female; D005625:Frontal Lobe / Q000502:physiology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000295:instrumentation / Q000379:methods*; D009778:Occipital Lobe / Q000502:physiology* / Q000601:surgery