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Background and Aim: Pneumoperitoneum (PP) for laparoscopic surgery is known to induce a pressor response. It can be attenuated by drugs, like opioids, vasodilators, beta blocking agents and alpha-2 agonists, but these drugs have their side effects. This study investigated the efficacy of magnesium sulphate to attenuate hemodynamic response associated with pneumoperitoneum in patients undergoing laparoscopic cholecystectomy. Methodology: This randomized, double blind, prospective study was carried out at Department of Anesthesiology, Maharishi Markandeshwar University, Mullana, Haryana (India). A total of 60 patients of ASA grade I or II, aged 20-60 y, of either sex, undergoing laparoscopic cholecystectomy, were randomly allocated into one of the two groups of 30 each. Standardized general anesthesia was administered to all patients. Group 1 patients received magnesium sulphate (30 mg/kg) intravenously as a bolus before induction of PP and Group 2 patients received same volume of 0.9% normal saline. Hemodynamic variables, e.g. heart rate (HR), systolic (SBP), diastolic (DBP), mean arterial pressures (MAP) were recorded from the start of surgery till extubation. Statistical analysis: SPSS version 17.0 for windows was used and p value of < 0.05 was considered significant. Results: Mean HR was 81.50 ± 8.44 vs. 93.03 ± 6.93/min, SBP was 126.37 ± 13.03 vs. 150.20 ± 10.45 mmHg, DBP was 82.50 ± 11.20 vs. 94.73 ± 8.33 mmHg, and MAP 98.43 ± 10.29 vs.113.27 ± 9.16 mmHg in Group 1 and Group 2, respectively, at 10 min after PP. Statistically significant fall in HR, SBP, DBP, MAP was seen in Group 1 at 10 min after PP till extubation. (p < 0.05). Conclusion: Intravenous magnesium sulphate effectively attenuates the hemodynamic response to pneumoperitoneum in laparoscopic cholecystectomy under general anesthesia.

anaesthesia, pain and intensive care

Effect of intravenous magnesium sulphate on hemodynamic response to pneumoperitoneum in laparoscopic cholecystectomy: A prospective, double blind study