title: Evaluation of the Truview™ EVO2 laryngoscope for nasotracheal intubation.
abstract: BACKGROUND
  The Truview™ EVO2 laryngoscope, with its unique optical lens system and blade tip angulation, has proved its usefulness in providing adequate laryngeal exposure and intubation via the oral route. However, the same has not been evaluated for nasotracheal intubation.
  
  
  OBJECTIVE
  We evaluated the suitability of the Truview™ EVO2 laryngoscope for nasotracheal intubation.
  
  
  METHODS
  Fifty ASA grade I and II elective surgical patients were studied. Patients aged below 15 years or having difficult airway were excluded. Under standard anesthesia protocol, nasotracheal intubation was performed using a Truview™ EVO2 laryngoscope and, in cases of inability to complete intubation in three attempts, the Macintosh laryngoscope was used. Time taken for intubation, use of Magill's forceps and need for optimization maneuvers were noted. The primary outcome was percentage of successful intubation, while hemodynamic changes and duration of intubation were taken as secondary outcomes.
  
  
  RESULTS
  Majority (94%) could be intubated successfully with the Truview™ EVO2 laryngoscope. Average time taken for intubation was 50.1 s. The hemodynamic changes were not clinically significant. Regression analysis revealed lack of association between duration of intubation and hemodynamic changes. There were no serious complications.
  
  
  CONCLUSIONS
  The Truview™ EVO2 laryngoscope is a useful tool in performing nasotracheal intubation, ensuring a high level of success rate among patients with normal airway anatomy.
authors.affiliation: Department of Anaesthesiology and Critical Care, K S Hegde Medical Academy of Nitte University, Deralakatte, Mangalore, Karnataka, India.
authors.forename: U S
authors.initials: US
authors.lastname: Raveendra
authors.forename: Sripada G
authors.initials: SG
authors.lastname: Mehandale
authors.forename: Sumalatha R
authors.initials: SR
authors.lastname: Shetty
authors.forename: Manjunath R
authors.initials: MR
authors.lastname: Kamath
keywords: Laryngoscope; Truview™ EVO2; nasotracheal intubation; orthognathic surgery