title: Can difficult intubation be easily and rapidly predicted?
abstract: OBJECTIVE
  Failed endotracheal intubation and inadequate ventilation with subsequent insufficient oxygenation can result in serious complications potentially leading to permanent health damage. Difficult intubation may occur not only in patients with apparent pathologies in the orofacial region but also, unexpectedly, in those without abnormalities. This study aimed at finding anthropometric parameters that are easy to examine and that would aid in predicting difficult intubation.
  
  
  METHODS
  A case-control study was undertaken. Based on defined criteria, 15 parameters were examined in patients with unanticipated difficult intubation. The parameters included a previous history of difficult intubation, pathologies associated with difficult intubation, clinical symptoms of airway pathology, the Mallampati score, upper lip bite test, receding mandible, and cervical spine and temporomandibular joint movement. Thyromental, hyomental and sternomental distances and inter-incisor gap were measured. The methods were precisely defined and the measurements were carried out by a trained anesthesiologist. Statistical analysis was performed on data from 74 patients with difficult intubation and 74 control patients with easy intubation.
  
  
  RESULTS
  Significant predictors of difficult intubation were inter-incisor gap (IIG), thyromental distance (TMD) and class 3 limited movement of the temporomandibular joint. The IIG and TMD cut-offs were set at 42 mm and 93 mm, respectively.
  
  
  CONCLUSIONS
  The results will be used to confirm these predictors in an anesthesiology clinic along with the aid of the laryngoscopic findings to improve the prediction of unanticipated difficult intubation.
authors.affiliation: Department of Anesthesiology, Resuscitation and Intensive Medicine, University Hospital Olomouc and Faculty of Medicine and Dentistry, Palacky University Olomouc, Czech Republic.
authors.forename: Sarka
authors.initials: S
authors.lastname: Fritscherova
authors.forename: Milan
authors.initials: M
authors.lastname: Adamus
authors.forename: Katerina
authors.initials: K
authors.lastname: Dostalova
authors.forename: Jirina
authors.initials: J
authors.lastname: Koutna
authors.forename: Lumir
authors.initials: L
authors.lastname: Hrabalek
authors.forename: Jana
authors.initials: J
authors.lastname: Zapletalova
authors.forename: Radovan
authors.initials: R
authors.lastname: Uvizl
authors.forename: Vladimir
authors.initials: V
authors.lastname: Janout
mesh_terms: D058109:Airway Management; D000402:Airway Obstruction / Q000209:etiology; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007442:Intubation, Intratracheal / Q000009:adverse effects / Q000379:methods; D007828:Laryngoscopy; D008297:Male; D008875:Middle Aged