Comparative study of I.V. magnesium sulphate and lignocaine for attenuating the haemodynamic stress during laryngoscopy and intubation

Background: Following induction of general anesthesia, laryngoscopy and endotracheal intubation produce pressor response that are somatic visceral reflexes brought on by stimulation of epipharynx and laryngopharynx. To avoid hemodynamic responses to intubation, several strategies have been tested. Agents like opioids, local anesthetics have been used to attenuate such response. Our study was employed with intravenous magnesium sulphate and lignocaine.
Methods: A total of 60 patients of both sexes in the age group between 15-50years, belonging to ASA grade I and II undergoing elective surgery under general anaesthesia. Out of  the 60 patients 30 were randomly included in the L group (lignocaine group) and the other 30 were included in the M group (magnesium sulphate group).
Results: There was fall in heart rate (p < 0.05) noted following induction, laryngoscopy, and intubation, in Magnesium group and Lignocaine group, but the fall in heart rate was more significant in the Magnesium group when compared with the Lignocaine group
Like heart rate there was a significant fall in mean arterial pressure in both the groups, but there was statistically significant fall (p < 0.05) in the Magnesium group when compared with the Lignocaine group.