Haemodynamic Response To Laryngoscopy And Intubation: Comparison Of McCoy And Macintosh Laryngoscope

A prospective randomized study was done to compare hemodynamic response to laryngoscopy and intubation using McCoy and Macintosh laryngoscope. Hundred patients of either sex, belonging to ASA grade I or II, between age group of 20-50 years, requiring general anaesthesia with intubation were included in the study. A standard anaesthesia technique was used in all the patients. Both the groups (n=50) were matched demographically. Mallampati grading, laryngoscopy and intubation time and laryngeal visualization grades were comparable. Hemodynamic variables at baseline and following induction were also statistically comparable. Following laryngoscopy there was statistically significant rise in HR, SBP, DBP and MAP in both the groups (31.32±6.96 bpm, 37.78±6.72mmHg, 36.18±7.95mmHg, 31.84±6.94mmHg in group A and 21.04±6.60 bpm, 18.16±4.75mmHg, 19.14±4.91mmHg, 18.48±5.97mmHg in group B respectively). A further rise was seen in all variables following intubation, which persisted till one minute after intubation. Increase in hemodynamic variables was statistically highly significant with Macintosh laryngoscope as compared to McCoy. It was concluded that McCoy laryngoscope produces significantly less marked hemodynamic response.