Comparison of Intubating Condition of the McGrath® Video Laryngoscope With and Without Muscle Relaxant

Abstract

Objective: The objectives of this study were to evaluate the intubating conditions using the McGrath® Series 5 Portable Video Laryngoscope (VL) with and without a muscle relaxant.Material and Methods: This randomized, prospective study was performed in 34 patients with ASA (American Society of Anesthesiologist) I-II who required oroendotracheal tube intubation. The patients were divided into two groups asthe rocuronium group and the placebo (saline) group. McGrath® VL intubation was initiated after 90 seconds when thepatient was fully relaxed. The primary outcome was the conditions of tracheal intubation between the two groups. Thesecondary outcome were the success rate of the first intubation attempt, time to intubation, required propofol dosagefor intubation, and the anesthetic events during the intraoperative and recovery room periods were evaluated.Results: Compared to the placebo group, the intubating conditions in the rocuronium group were more acceptable(excellent or good conditions) (88.2 vs. 41.2%; p-value=0.007). There were no significant differences in the successrates of first attempt intubations (16(94.1), 13(76.5); p-value=0.4). In comparison to the rocuronium group, the placebogroup required more propofol (218 mg vs. 186 mg; p-value=0.023). The rates of intraoperative and recovery roomevents were similar.Conclusion: Overall the intubating conditions when using the McGrath® VL Series 5 Portable Video Laryngoscope usingmuscle relaxants were more acceptable than when not using muscle relaxants, but there were no significant differencesin the number of attempts, time to intubation, and anesthetic events between the study groups.