title: Effect of alfentanil on intracranial pressure during propofol-fentanyl anesthesia for craniotomy. A randomized prospective dose-response study.
abstract: BACKGROUND
  The effect of alfentanil on intracranial pressure (ICP) in patients with supratentorial cerebral tumors has only been sparsely examined and with somewhat contradictory results.
  
  
  METHODS
  Thirty-one patients were anesthetized with propofol and fentanyl. After removal of the bone flap a bolus-dose of alfentanil 10 (group 1), 20 (group 2), or 30 microg kg(-1) (group 3) was administered followed by an infusion of 10, 20, or 30 microg.kg(-1).h(-1) to patients in groups 1, 2, and 3, respectively. A control group received no alfentanil. Subdural ICP, mean arterial blood pressure (MAP), and cerebral perfusion pressure (CPP) were monitored and arterial and jugular bulb blood were sampled before and every minute for 5 min after the bolus administration of alfentanil and again after 5 min of hyperventilation to be able to calculate cerebral arterio-venous oxygen content difference (AVDO2) and carbon dioxide reactivity (CO2-reactivity).
  
  
  RESULTS
  No changes in subdural ICP or AVDO2 from alfentanil in the study period were observed within the groups. However, alfentanil decreased MAP and CPP. The maximum CPP decrease (mean value of each group) was 4 mmHg, 8 mmHg, and 18 mmHg in groups 1, 2, and 3, respectively. There was no difference between groups as regards the CO2-reactivity.
  
  
  CONCLUSIONS
  We conclude that administration of alfentanil to propofol-fentanyl anesthetized patients with supratentorial cerebral tumors decreases MAP and CPP in a dose-related way, but does not influence subdural ICP, AVDO2 or the CO2-reactivity.
authors.affiliation: Department of Anesthesia and Intensive Care, Glostrup Hospital, University of Copenhagen, Denmark. kask@glostruphosp.kbhamt.dk
authors.forename: K S
authors.initials: KS
authors.lastname: Olsen
authors.forename: N
authors.initials: N
authors.lastname: Juul
authors.forename: G E
authors.initials: GE
authors.lastname: Cold
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015760:Alfentanil / Q000494:pharmacology*; D000701:Analgesics, Opioid / Q000494:pharmacology*; D000771:Anesthesia, Intravenous; D018686:Anesthetics, Intravenous; D002245:Carbon Dioxide / Q000097:blood; D003399:Craniotomy; D004305:Dose-Response Relationship, Drug; D005260:Female; D005283:Fentanyl; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D007427:Intracranial Pressure / Q000187:drug effects*; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D010101:Oxygen Consumption / Q000187:drug effects; D015742:Propofol; D011446:Prospective Studies
chemical_list: D000701:Analgesics, Opioid; D018686:Anesthetics, Intravenous; D002245:Carbon Dioxide; D015760:Alfentanil; D005283:Fentanyl; D015742:Propofol