title: Success rates and endotracheal tube insertion times of experienced emergency physicians using five video laryngoscopes:  a randomised trial in a simulated trapped car accident victim.
abstract: BACKGROUND
  No randomised controlled trial has yet compared different video laryngoscopes in respect of the success rates and the time taken to achieve endotracheal intubation in trapped car accident victims.
  
  
  OBJECTIVE
  The aim of the present study was to evaluate whether five video laryngoscopes facilitate tracheal intubation more quickly or more securely than conventional laryngoscopy.
  
  
  METHODS
  Prospective, controlled, randomised crossover trial.
  
  
  METHODS
  An airway manikin was placed on the driver's seat of a compact car. Access was possible only through the opened driver's door.
  
  
  METHODS
  Twenty-five experienced anaesthetists.
  
  
  METHODS
  Tracheal intubation in a simulated trapped patient using video laryngoscopes in a typical out-of-hospital setting.
  
  
  METHODS
  Times to achievement of a view of the glottis, tracheal intubation, cuff inflation, first ventilation and tracheal tube position were compared using a standard Macintosh laryngoscope or Glidescope Ranger, Storz C-MAC, Ambu-Pentax AWS, Airtraq and McGrath Series 5 video laryngoscopes in a randomised order. Wilcoxon signed-rank test and McNemar test were used for statistical analysis. A P value of less than 0.05 was considered statistically significant.
  
  
  RESULTS
  Twenty-five anaesthetists (35.1 ± 7.3 years; 16 male, nine female) with an intubation experience of 374 ± 96 intubations per year and an experience of 9.1 ± 7.3 years participated. Glottic view, tracheal intubation, cuff inflation and first ventilation were achieved most rapidly with the Macintosh laryngoscope, although the Airtraq and Pentax AWS video laryngoscopes were not significantly slower. Times were significantly longer when the Glidescope Ranger, McGrath Series 5 or Storz C-MAC video laryngoscopes were used (P < 0.05), failure to place the endotracheal tube correctly was significantly commoner with the McGrath Series 5 than with the Macintosh (P = 0.031).
  
  
  CONCLUSIONS
  When attempting to intubate a trapped car accident victim, video laryngoscopes provide a better view of the glottis, but some delay tracheal intubation significantly. The devices with a tube guide (Airtraq and Ambu Pentax AWS) enable tracheal intubation to be achieved significantly faster and with a lower failure rate than devices without a tube guide. No video laryngoscope outperformed direct laryngoscopy with a Macintosh laryngoscope in this simulation study.
authors: From the Department of Anaesthesiology and Intensive Care Medicine, University Hospital of Cologne, Cologne, Germany.
authors: Wolfgang A
authors: WA
authors: Wetsch
authors: Martin
authors: M
authors: Carlitscheck
authors: Oliver
authors: O
authors: Spelten
authors: Peter
authors: P
authors: Teschendorf
authors: Martin
authors: M
authors: Hellmich
authors: Harald V
authors: HV
authors: Genzwürker
authors: Jochen
authors: J
authors: Hinkelbein
mesh_terms: D000063:Accidents, Traffic; D000328:Adult; D002983:Clinical Competence / Q000592:standards*; D018592:Cross-Over Studies; D004632:Emergency Medical Services / Q000379:methods / Q000592:standards*; D006801:Humans; D007442:Intubation, Intratracheal / Q000295:instrumentation / Q000379:methods / Q000592:standards*; D020704:Laryngoscopes; D008875:Middle Aged; D010820:Physicians / Q000592:standards*; D011446:Prospective Studies; D013997:Time Factors; D020535:Video-Assisted Surgery / Q000295:instrumentation / Q000379:methods / Q000592:standards*