title: The incidence, success rate, and complications of awake tracheal intubation in 1,554 patients over 12 years: an historical cohort study.
abstract: OBJECTIVE
  Awake tracheal intubation is one recommended option to address select situations in the management of a patient with an anticipated difficult airway. A scarcity of data exists on how often awake intubation is performed or whether its use is changing over time, particularly with the increasingly widespread availability of video laryngoscopy. This retrospective database review was undertaken to determine the incidence, success, and complications of awake intubation and the incidence of other tracheal intubation techniques in the operating room over a 12-yr period (2002-2013) at our institution.
  
  
  METHODS
  The Anesthesia Information Management System in use at a Canadian tertiary care centre was searched for all awake intubations that occurred during the years 2002-2013. Records were also searched to identify airway methods other than direct laryngoscopy that may have been used after the induction of general anesthesia. Changes in both the incidence of awake intubation and in the use of video laryngoscopy over the 12 years were analyzed using linear regression modelling.
  
  
  RESULTS
  Of 146,252 cases performed under general anesthesia with endotracheal intubation, 1,554 intubations (1.06%) were performed awake. There was no significant change in the rate of awake intubation over the studied years (slope -1.4(-4) incidence·year(-1); 95% confidence interval [CI]: -3.0(-4) to 3.0(-5); P = 0.102). The relatively steady rate of awake intubation occurred despite a significant increase in the use of video laryngoscopy over the same time (slope 0.080 incidence·year(-1); 95% CI: 0.076 to 0.083; P < 0.001), particularly from 2009 onwards. Attempted awake intubation failed in 31 (2%) of the cases. Self-reported complications occurred in 15.7% of successful procedures. In addition, in a convenience sample of three years (2011-2013), the rate at which each of 49 attending staff performed awake intubation varied widely from 0-3.4 awake intubations per 100 cases of general anesthesia with endotracheal intubation.
  
  
  CONCLUSIONS
  At our tertiary care centre, we did not find a significant change in the use of awake tracheal intubation over the studied years 2002-2013 despite increasing availability and use of video laryngoscopy. It appears that awake tracheal intubation retains an important and consistent role in the management of the difficult airway.
authors.affiliation: Department of Anesthesia, Dalhousie University, QEII Health Sciences Centre, Halifax, Infirmary Site, 1796 Summer Street, Halifax, NS, B3H 3K9, Canada, jlaw@dal.ca.
authors.forename: J Adam
authors.initials: JA
authors.lastname: Law
authors.forename: Ian R
authors.initials: IR
authors.lastname: Morris
authors.forename: Paul A
authors.initials: PA
authors.lastname: Brousseau
authors.forename: Sylvia
authors.initials: S
authors.lastname: de la Ronde
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Milne
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D058109:Airway Management / Q000379:methods*; D000768:Anesthesia, General / Q000379:methods; D002170:Canada; D015331:Cohort Studies; D016208:Databases, Factual; D005260:Female; D006801:Humans; D015994:Incidence; D007442:Intubation, Intratracheal / Q000009:adverse effects / Q000379:methods*; D007828:Laryngoscopy / Q000379:methods*; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014741:Video Recording; D014851:Wakefulness; D055815:Young Adult