Abstract
Glottic view (Cormack-Lehane grade I vs. grade II) was better with the GlideScope than with direct laryngoscopy overall (relative risk, 2.0) and for nondifficult intubations (RR, 1.5) and simulated difficult intubations (manual in-line stabilization; RR, 3.5). Among nonexpert operators, the rate of first-attempt intubation success was higher (RR, 1.8), and intubation time was faster (weighted mean difference, 43 seconds) with the GlideScope than with direct laryngoscopy; no success or time differences were observed among expert intubators. Comment: Glottic visualization was better with the GlideScope than direct laryngoscopy, especially for patients with simulated difficult airways. Nonexpert operators likely had faster and more-successful intubations with the GlideScope because the GlideScope technique is easier to master than direct laryngoscopy. This meta-analysis provides yet another convincing piece of evidence supporting use of video laryngoscopy over conventional direct laryngoscopy.
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