IRCT20110514006481N11 IRCT 2019-02-19 Semnan University of Medical Sciences Method of laryngeal mask size selection on post-operative sore throat Effect of choosing the size of laryngeal mask based on width of tongue on ease of placement, effective ventilation and post-operative sore throat. 2019-02-20 anticipated 60 Complete https://irct.ir/trial/36882 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Other design features: -, Randomization description: Randomization is done using stratified permuted block randomization. Patients are divided into two stratum of women and men. For each stratum, a separate random assignment continues to reach the sample size. For random assignment in each stratum, four blocks of (A, B), which include different states of test and control sequences (AABB, ABAB …), are used. Block selection is done according to a random digits table, Blinding description: In this study, a person who places a laryngeal mask for patient, as well as the patients and a person who complete the questionnaire are not aware of the type of intervention. N/A Oedema of larynx. Intervention 1: Intervention group: For these patients, the laryngeal mask selection is performed by matching the largest mask width and the largest portion of the patient's tongue. Intervention 2: Control group: For these patients, the laryngeal mask selection is performed by the patient's weight. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is not more information