title: Comparison of Macintosh, Truview EVO2, Glidescope, and Airwayscope laryngoscope use in patients with cervical spine immobilization.
abstract: BACKGROUND
  The purpose of this study was to evaluate the effectiveness of the Pentax AWS, Glidescope, and the Truview EVO2, in comparison with the Macintosh laryngoscope, when performing tracheal intubation in patients with neck immobilization using manual in-line axial cervical spine stabilization.
  
  
  METHODS
  One hundred and twenty consenting patients presenting for surgery requiring tracheal intubation were randomly assigned to undergo intubation using a Macintosh (n=30), Glidescope (n=30), Truview EVO2 (n=30), or AWS (n=30) laryngoscope. All patients were intubated by one of the three anaesthetists experienced in the use of each laryngoscope.
  
  
  RESULTS
  The Glidescope, AWS, and Truview EVO2 each reduced the intubation difficulty score (IDS), improved the Cormack and Lehane glottic view, and reduced the need for optimization manoeuvres, compared with the Macintosh. The mean IDS was significantly lower with the Glidescope and AWS compared with the Truview EVO2 device, and the IDS was lowest with the AWS. The duration of tracheal intubation attempts was significantly shorter with the Macintosh compared with the other devices. There were no differences in success rates between the devices tested. The AWS produced the least haemodynamic stimulation.
  
  
  CONCLUSIONS
  The Glidescope and AWS laryngoscopes required more time but reduced intubation difficulty and improved glottic view over the Macintosh laryngoscope more than the Truview EVO2 laryngoscope when used in patients undergoing cervical spine immobilization.
authors.affiliation: Department of Anaesthesia, Clinical Sciences Institute, Galway University Hospitals, Galway, Ireland.
authors.forename: M A
authors.initials: MA
authors.lastname: Malik
authors.forename: C H
authors.initials: CH
authors.lastname: Maharaj
authors.forename: B H
authors.initials: BH
authors.lastname: Harte
authors.forename: J G
authors.initials: JG
authors.lastname: Laffey
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001794:Blood Pressure; D002574:Cervical Vertebrae / Q000293:injuries*; D004867:Equipment Design; D005260:Female; D006801:Humans; D007103:Immobilization; D007442:Intubation, Intratracheal / Q000295:instrumentation / Q000379:methods; D020704:Laryngoscopes; D007828:Laryngoscopy / Q000379:methods; D008297:Male; D008875:Middle Aged; D013997:Time Factors