title: Stress hormones during the wake-up test in scoliosis surgery.
abstract: OBJECTIVE
  To compare hemodynamic and endocrine stress responses of two anesthetic regimes during intraoperative wake-up tests in scoliosis surgery.
  
  
  METHODS
  Randomized, controlled clinical study.
  
  
  METHODS
  University hospital.
  
  
  METHODS
  40 ASA physical status I and II teenage patients scheduled for scoliosis surgery.
  
  
  METHODS
  Patients were randomly divided into two groups: the propofol group (Group P) and the sevoflurane group (Group S). In Group P, anesthesia was induced with propofol and remifentanil and was maintained with infusions. Sevoflurane and remifentanil were used in Group S. After surgical instrumentation, patients were awakened, and the wake-up times were recorded. To determine the stress responses, blood samples were taken before induction, 10 minutes after surgical incision, before the wake-up test, during the wake-up test, and 10 minutes after the wake-up test. Cortisol, epinephrine, and norepinephrine concentrations, and hemodynamics all were recorded at the same time.
  
  
  RESULTS
  The times from discontinuation of anesthetics to eye opening and movement were similar in both groups. Epinephrine and norepinephrine concentrations during the wake-up test were significantly higher than pretest results in both groups (p < 0.001). There were no statistically significant differences between groups in heart rate or blood pressure.
  
  
  CONCLUSIONS
  Propofol-remifentanil anesthesia is equivalent to sevoflurane-remifentanil anesthesia for a wake-up test. Both the propofol- and sevoflurane-based anesthetic regimens abolish hemodynamic and endocrine stress responses to incision for scoliosis surgery in teenagers. Intraoperative wake-up testing is associated with substantial catecholamine stress despite virtually unchanged mean arterial pressure and heart rate.
authors.affiliation: Department of Anesthesiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey. aheroglu@hotmail.com
authors.forename: Ahmet
authors.initials: A
authors.lastname: Eroglu
authors.forename: Mine
authors.initials: M
authors.lastname: Solak
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Ozen
authors.forename: Osman
authors.initials: O
authors.lastname: Aynaci
mesh_terms: D000293:Adolescent; D018685:Anesthetics, Inhalation; D018686:Anesthetics, Intravenous; D001794:Blood Pressure / Q000502:physiology; D004311:Double-Blind Method; D004837:Epinephrine / Q000097:blood; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006728:Hormones / Q000097:blood*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D008297:Male; D008738:Methyl Ethers; D009068:Movement; D009638:Norepinephrine / Q000097:blood; D019637:Orthopedic Procedures; D010880:Piperidines; D015742:Propofol; D000077208:Remifentanil; D012600:Scoliosis / Q000601:surgery*; D000077149:Sevoflurane; D013312:Stress, Physiological / Q000097:blood* / Q000503:physiopathology; D014851:Wakefulness / Q000502:physiology*
chemical_list: D018685:Anesthetics, Inhalation; D018686:Anesthetics, Intravenous; D006728:Hormones; D008738:Methyl Ethers; D010880:Piperidines; D000077149:Sevoflurane; D000077208:Remifentanil; D006854:Hydrocortisone; D009638:Norepinephrine; D015742:Propofol; D004837:Epinephrine