2021 Volume 49 Issue 4 Pages 167-171
Background : Video laryngoscopes such as the McGRATH® MAC with X bladeTM (Xb) are reportedly effective in cases of tracheal intubation for difficult airway scenarios. However, the intubation time is strongly dependent on familiarity with the device. The purpose of this study was to investigate the minimum number of training experiences required to perform video laryngoscopy using Xb successfully in less than 30 seconds in a mannequin model.
Methods : This study was conducted in 7 participants with less than 100 intubation experiences (group L) and in 10 participants with 100 to 200 intubation experiences (group H). Each participant was asked to perform a total of 10 video laryngoscopy procedures, taking turns one at a time, on a mannequin with a limited mouth opening (20 mm) and no back bending of the head using Xb. Video laryngoscopy was considered to have failed if more than 30 seconds were required or the maxillary anterior teeth were displaced. The success rate of video laryngoscopy and the time required to obtain an optimal view of the larynx were recorded. A two-way repeated measures analysis of variance using the linear mixed model and the Bonferroni test were used. A p value less than 0.05 was considered statistically significant.
Results : A two-way repeated measures analysis of variance showed no interaction between the groups and the number of successful attempts or the time required to obtain an optimal view of the larynx. Four participants failed their first attempt, while all the participants succeeded at their nineth attempt. The time required to obtain an optimal view of the larynx became significantly faster at the seventh attempt and thereafter.
Conclusions : Practice using a mannequin model successfully reduced the video laryngoscopy time. All the participants were able to perform video laryngoscopy successfully at their ninth attempt.
