Comparison of the C-MAC D-blade video laryngoscope and the McCoy laryngoscope for double-lumen endotracheal tube intubation A prospective randomized controlled study

Background: Inserting a double-lumen endotracheal tube (DLT) poses more challenge than inserting a single-lumen tube. The C-MAC D-blade videolaryngoscope is a useful alternative to the direct laryngoscope. However, no study has compared its performance with that of the McCoy laryngoscope, which has a hyperangulated blade tip similar to that of the C-MAC D-blade. We aimed to compare the performance of the C-MAC D-blade videolaryngoscope with that of the McCoy laryngoscope in DLT intubation. Methods: In this prospective randomized controlled study, 90 patients requiring DLT intubation were randomly allocated to either the C-MAC D-blade videolaryngoscope group (group C, n=47) or McCoy laryngoscope group (group M, n=43). During intubation, the percentage of glottic opening, modified Cormack-Lehane grade, time taken for intubation, malposition of the bronchial lumen, and hemodynamic parameters were recorded. After intubation, we assessed the intubation difficulty scale score and, a postoperative sore throat in the recovery room. Results: The time taken for intubation was 35.8510.77 seconds and 33.18 +/- 11.97 seconds in groups C and M, respectively (P=.269). The modified Cormack-Lehane grade was significantly lower in group C than in group M (P=.000). Percentage of glottic opening was significantly higher in group C (79.36 +/- 13.42%) than in group M (53.49 +/- 29.83%) (P=.000). The intubation difficulty scale score was significantly lower in group C than in group M (P=.030). There were no significant differences between the 2 groups in terms of malposition status, hemodynamic parameters, or visual analog scale score for a postoperative sore throat. Conclusion: Although the time taken for intubation was comparable between the 2 intubation devices, the C-MAC D-blade videolaryngoscope facilitated glottis visualization and reduced the intubation difficulty scale better than the McCoy laryngoscope in patients undergoing DLT intubation.