title: Comparison of McGRATH MAC and Macintosh laryngoscopes for double-lumen endotracheal tube intubation by anesthesia residents: a prospective randomized clinical trial.
abstract: OBJECTIVE
  This study aimed to compare the utility of McGRATH MAC (McG) and Macintosh (McL) laryngoscopes for double-lumen endotracheal tube intubation in patients undergoing elective surgery.
  
  
  METHODS
  Randomized clinical trial.
  
  
  METHODS
  Operating room.
  
  
  METHODS
  Fifty adult patients scheduled for elective surgery under 1-lung ventilation with American Society of Anesthesiologists physical status 1 to 3.
  
  
  METHODS
  Double-lumen endotracheal tube intubation was performed with the McG (McG group; 25 patients) or conventional McL (McL group; 25 patients) laryngoscope by anesthesia residents.
  
  
  METHODS
  The number of attempts to successful intubation, intubation time, percentage of glottis opening score, and subjective difficulty of laryngoscopy and tube passage through the glottis were assessed.
  
  
  RESULTS
  The total numbers of intubation attempts were 1 (McG group, 24 patients; McL group, 16 patients), 2 (McG group, 1 patient; McL group, 8 patients), and 3 (McG group, 0 patient; McL group, 1 patient), with significant differences between the two groups (P = .018). Intubation time was significantly shorter in the McG group compared with the McL group (McG: 17.1 ± 4.6 seconds vs McL: 20.8 ± 5.9 seconds, P = .026). The percentage of glottis opening score was significantly higher in the McG group compared with the McL group (McG: 88.4% ± 13.7% vs McL: 71.4% ± 20.4%, P = .004).
  
  
  CONCLUSIONS
  The McG demonstrated a better intubation profile compared with the McL, possibly due to its ease of use for double-lumen endotracheal tube intubation. Clinical Trial registry number: UMIN000014636.
authors.affiliation: Department of Anesthesiology, Osaka Medical College, Daigaku-machi 2-7, Takatsuki, Osaka 569-8686 Japan.
authors.forename: Haruki
authors.initials: H
authors.lastname: Kido
authors.affiliation: Department of Anesthesiology, Osaka Medical College, Daigaku-machi 2-7, Takatsuki, Osaka 569-8686 Japan. Electronic address: ane078@poh.osaka-med.ac.jp.
authors.forename: Nobuyasu
authors.initials: N
authors.lastname: Komasawa
authors.affiliation: Department of Anesthesiology, Osaka Medical College, Daigaku-machi 2-7, Takatsuki, Osaka 569-8686 Japan.
authors.forename: Sayuri
authors.initials: S
authors.lastname: Matsunami
authors.affiliation: Department of Anesthesiology, Osaka Medical College, Daigaku-machi 2-7, Takatsuki, Osaka 569-8686 Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Kusaka
authors.affiliation: Department of Anesthesiology, Osaka Medical College, Daigaku-machi 2-7, Takatsuki, Osaka 569-8686 Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Minami
mesh_terms: D000328:Adult; D000368:Aged; D000769:Anesthesia, Inhalation; D005260:Female; D005931:Glottis; D006685:Hoarseness / Q000453:epidemiology / Q000209:etiology; D006801:Humans; D007396:Internship and Residency; D007442:Intubation, Intratracheal / Q000009:adverse effects / Q000379:methods*; D020704:Laryngoscopes / Q000009:adverse effects; D007828:Laryngoscopy / Q000009:adverse effects / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010149:Postoperative Pain / Q000453:epidemiology; D011183:Postoperative Complications / Q000453:epidemiology; D011446:Prospective Studies; D016896:Treatment Outcome
keywords: Double-lumen endotracheal tube intubation; Macintosh laryngoscope; McGRATH MAC