Incidence and severity of POST was assessed at 1, 6 and 24 hr and graded on four point scale (0-3). Collected data was analysed using SPSS. Fisher's Exact test and Mann Whitney U test was used to compare incidence and severity of POST among groups respectively. P<0.05 was considered statistically significant. Results: The overall incidence of POST was 53%, where 54 (77%) in Group A and 21 (30%) patients in Group B experienced POST (p<0.0001). POST was significantly attenuated at 1 hr and 6 hr in Group B (p<0.05). POST occurred in 31 patients of Group A versus 6 patients in Group B at 6 hr. Conclusion: Magnesium sulfate nebulization significantly attenuated incidence and severity of POST in patients undergoing surgery in Prone Position.
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