title: [Efficacy of videolaryngoscopes for nasotracheal intubation: a meta-analysis of randomized controlled trials].
abstract: BACKGROUND
  Increased evidence indicates that the videolaryngoscope is useful for nasotracheal intubation. The aim of this meta-analysis is to assess the efficacy of videolaryngoscopes (Glidescope, Airtraq and Pentax-AWS) in nasotracheal intubations, comparing with that of Macintosh laryngoscopy.
  
  
  METHODS
  The systematic search, data extraction, critical appraisal, and pooled analysis were performed according to the PRISMA statement. The relative risk (RR), mean difference (MD), and their corresponding 95% confidence intervals (CIs) were calculated by the Comprehensive Meta-analysis version 2.2.040 software for dichotomous and continuous outcomes, respectively.
  
  
  RESULTS
  Seven randomized controlled trials included 294 tracheal intubations by videolaryngoscopes and 253 tracheal intubations by Macintosh laryngoscopy. Videolaryngoscopes showed higher success rate (RR 1.116, 95% CI 1.021-1.220, P < 0.0155, I2 : 51%) and shorter intubation time (MD -11.9 sec, 95% CI-18.9(-) -5.0 sec, P < 0.0008, I2 84%) compared with the Macintosh laryngoscope.
  
  
  CONCLUSIONS
  Our meta-analysis showed that the videolaryngoscope has an advantage over Macintosh laryngoscope in nasotracheal intubations.
authors.affiliation: Department of Anesthesiology, International University of Health and Welfare Hospital, Nasushiobara 329-2763.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Hirabayashi
authors.affiliation: Department of Anesthesiology, Saitama Medical University, Saitama 350-0495.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hoshijima
authors.affiliation: Department of Anesthesiology, International University of Health and Welfare Hospital, Nasushiobara 329-2763.
authors.forename: Norifumi
authors.initials: N
authors.lastname: Kuratani
authors.affiliation: Department of Dent-oral Anesthesiology, Tohoku University Hospital, Sendai 980-8574.
authors.forename: Eiji
authors.initials: E
authors.lastname: Masaki
mesh_terms: D004867:Equipment Design; D006801:Humans; D007442:Intubation, Intratracheal / Q000295:instrumentation* / Q000379:methods; D020704:Laryngoscopes; D016032:Randomized Controlled Trials as Topic; D014741:Video Recording