GlideScope Use improves intubation success rates: an observational study using propensity score matching.
BACKGROUND
Rigid video laryngoscopes are popular alternatives to direct laryngoscopy for intubation, but further large scale prospective studies comparing these devices to direct laryngoscopy in routine anesthesiology practice are needed. We hypothesized that the first pass success rate with one particular video laryngoscope, the GlideScope, would be higher than the success rate with direct laryngoscopy.


METHODS
3831 total intubation attempts were tracked in an observational study comparing first-pass success rate using a Macintosh or Miller-style laryngoscope with the GlideScope. Propensity scoring was then used to select 626 subjects matched between the two groups based on their morphologic traits.


RESULTS
Comparing the GlideScope and direct laryngoscopy groups suggested that intubation would be more difficult in the GlideScope group based on the Mallampati class, cervical range of motion, mouth opening, dentition, weight, and past intubation history. Thus, a propensity score based on these factors was used to balance the groups into two 313 patient cohorts. Direct laryngoscopy was successful in 80.8% on the first-pass intubation attempt, while the GlideScope was successful in 93.6% (p <0.001; risk difference of 0.128 with a 95% CI of 0.0771 - 0.181).


CONCLUSIONS
A greater first-attempt success rate was found when using the GlideScope versus direct laryngoscopy. In addition, the GlideScope was found to be 99% successful for intubation after initial failure of direct laryngoscopy, helping to reduce the incidence of failed intubation.
Department of Anesthesiology, VA Pittsburgh Healthcare System and Department of Anesthesiology, University of Pittsburgh School of Medicine, Pittsburgh, PA USA.
James W
JW
Ibinson
Department of Anesthesiology, VA Pittsburgh Healthcare System and Department of Anesthesiology, University of Pittsburgh School of Medicine, Pittsburgh, PA USA.
Catalin S
CS
Ezaru
Department of Anesthesiology, University of Pittsburgh Medical Center, Pittsburgh, PA USA.
Daniel S
DS
Cormican
Department of Anesthesiology, VA Pittsburgh Healthcare System and Department of Anesthesiology, University of Pittsburgh School of Medicine, Pittsburgh, PA USA.
Michael P
MP
Mangione
D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D055815:Young Adult; D000776:Anesthesiology / Q000379:methods; D004867:Equipment Design; D007442:Intubation, Intratracheal / Q000295:instrumentation / Q000379:methods; D020704:Laryngoscopes; D007828:Laryngoscopy / Q000295:instrumentation / Q000379:methods; D057216:Propensity Score; D011446:Prospective Studies; D014741:Video Recording
Airway management; Difficult intubation; Direct laryngoscopy