Background and Goal of Study: Recently, different types of video laryngoscopes have been reported for use in double-lumen tube (DLT) intubation. However, the advantages and disadvantages between them remain undetermined for DLT intubation. This study aimed to compare the utility of AirtraqTM double lumen (Airtraq DL) and McGRATHTM MAC (McG) video laryngoscope for double-lumen endotracheal tube intubation in patients undergoing elective surgery by one experienced anesthesiologist.
Materials and Methods: This study was approved by the institutional review board of Tokai University, School of Medicine, and written informed consent was obtained from each patient. A total of 37 patients who were scheduled for elective surgeries were enrolled in this study and randomly allocated to one of two groups; in each group, Airtraq DL attaching the phone adaptor to a smartphone (IPod of the hospital management was used to protect personal information) or McG was used for tracheal intubation. After regular induction of anesthesia, tracheal intubation with a video laryngoscope was performed by one experienced anesthesiologist. Our primary outcome measure was the intubation time. The intubation time was defined as the time from insertion of the device into the oral cavity to removal of the device from the oral cavity. The intubation time was compared between the devices using an unpaired t-test. The Mann-Whitney U test was used to assess intubation time. Data are presented as mean ± SD. P ＜ 0.05 was considered statistically significant. 
Results and Discussion: All the patients in the study were intubated successfully at the first attempt without any adverse effect. Exposure time was comparable between groups (P>0.05). Intubation time was significantly shorter in the Airtraq DL group compared with the McG group (Airtraq DL: 15.9 ± 0.8 seconds vs McG: 18.2 ± 0.6 seconds, P=0.033, respectively). 
Conclusion: When using video laryngoscopes for DLT intubation, Airtraq DL is superior McG in intubation time by one experienced anesthesiologist.


06 / Comparison of AirtraqTM double lumen and McGRATHTM MAC video laryngoscope for double-lumen endotracheal tube intubation by an experienced anesthesiologist: a prospective randomized clinical trial.

