Comparing the safety and efficacy of three different doses of atracurium in facilitating the insertion of laryngeal mask airway in patients undergoing phacoemulsification cataract surgery: A randomized clinical trial

BACKGROUND: In this study, we aimed to evaluate the safety and efficacy of three different doses of atracurium on conditions of laryngeal mask airway (LMA) insertion, first-try success rate, and possible complications. MATERIALS AND METHODS: A total of 120 patient's ≥18 years old were randomly divided into three groups of 40. The study groups received fentanyl 2 μg/kg thiopental 5 mg/kg and atracurium in doses 0.2 mg/kg, 0.4 mg/kg, and 0.6 mg/kg, respectively, based on the patient group. The conditions of LMA insertion, hemodynamic responses, and complications were evaluated and compared in the groups. RESULTS: In the study groups, the LMA placement was difficult in 15%, 7.5%, and 2.5%, respectively (P = 0.13). There was no statistically significant difference among the groups regarding the success rate in the first attempt to the insertion of LMA. Of the three groups, 5%, 2.5%, and 2.5% had bleeding at the place of mask insertion (P = 0.77). 17.5%, 7.5%, and12.5% had sore throat, respectively (P = 0.4). No patient experienced laryngospasm during the study. Furthermore, changes in blood pressure, heart rate, and oxygen saturation were not significant in the three groups. CONCLUSION: All three doses of atracurium have similar effects on the condition of LMA insertion. Atracurium 0.4 mg/kg accompanied by higher success on LMA insertion in the first attempt and lower airway complications (bleeding and sore throat), increasing this dose had no significant effect on the success rate of LMA insertion.