A comparison of C-MAC videolaryngoscope and Macintosh laryngoscope in intraocular pressure changes, throat pain, intubation time and hemodynamic variables

Abstract

Objective: The aim of the current study was to compare intraocular pressure (IOP), hemodynamic parametersand throat pain in the use of C-MAC videolaryngoscope and the Macintosh laryngoscope under generalanesthesia requiring endotracheal intubation.Methods: Seventy-eight patients aged 18-65 years, ASA (American Society of Anesthesiologists physicalstatus). I-II, who underwent elective surgery under general anesthesia were scheduled in the study. The groupswere allocated as Group M (Macintosh laryngoscope) and Group VL (videolaryngoscope). Standard anesthesiatechnique was used in both groups. To assess the depth of anesthesia which was kept between 40 and 60, aBispectral Index Monitor Model 2000 (Aspect Medical Systems, Inc, Newton, MA) was used throughout thestudy. We recorded hemodynamic variables, oxygen saturation before induction, at the 3rd and at the 10thminutes after intubation. The duration of intubation was recorded as the time from the laryngoscope enteringthe mouth to removal with end-tidal carbon dioxide on the monitor. IOP was measured before induction, andat the 3rd and 10th minutes after intubation. Inhalation agent was given after intubation. 78 patients wereincluded in the study. We recorded cough after extubation, and postoperative sore throat was evaluated by ananesthesiologist who was blinded to the group allocations at 10 minutes and at 24 hours postoperatively.Results: There was no significant difference between the groups regarding age (p > 0.05), mean body massindex (p = 0.157), mean ASA (p = 0.475), mean bispectral index values (p = 0.084) and mean operating time(p = 0.068). The mean duration of intubation was determined to be statistically significantly longer in GroupM than in Group VL (p = 0.0001). There was no statistically significant difference between the groups regardingModified Mallampati Score (p = 0.571) and Cormack Lehane Score (p = 0.819). The mean IOP at 3rd minuteafter intubation was determined to be statistically significantly higher in Group M (p = 0.0001). There was nostatistically significant difference between the groups in regarding cough after extubation (p = 0.549), throatpain at 10 minutes (p = 0.662) and at 24 hours postoperatively.Conclusions: C-MAC videolaryngoscope can be recommended as the first choice in patients with high IOPrequiring general anesthesia with endotracheal intubation.