IRCT201202159025N1 IRCT 2012-04-12 Vice chancellor for research, Shiraz University of Medical Sciences Comparison of four ways for insertion of laryngeal mask Comparison of efficacy, ease and speed of insertion and post operative complications of classic laryngeal mask airway (C-LMA) using four different methods in elective surgeries under general anesthesia 2012-02-29 anticipated 200 Complete https://irct.ir/trial/9649 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive. 2-3 Cataract. Intervention 1: 1st Method: Standard method: The patient’s head is extended by one hand and the proximal part of LMA is placed in the other hand in such a way that it is entered the patient mouth from gap surface side. Then, the LMA is moved along the hard palate with the forefinger until a resistance is felt due to oropharynx and the cuff is expanded based on manometer and finally the leakage is checked. Intervention 2: 2nd Method: Lateral method: The patient’s head is extended by one hand and the proximal part of LMA is placed in the other hand in such a way that it is entered the patient mouth as standard method in such a way that the entire cuff is located in mouth. Then, the cuff is rotated at 45 degree angle laterally in such a way that only tongue side is in contact with mask edge. Then, the forefinger and thumb is used to move it along the mouth until a resistance is felt. Finally, the mask is rotated 45 degree in opposite direction and located in middle position and the cuff is expanded based on manometer and leakage is checked. Intervention 3: 3rd Method: Rotational method: The patient’s head is extended by one hand and the proximal part of LMA is placed in the other hand in such a way that it is entered the patient mouth with 180 degree angle (the mask gap is toward hard palate). Then, it is moved along the mouth until a resistance is felt. Finally, it is rotated 180 degree and fixed behind the larynx and the cuff is expanded based on manometer and leakage is checked, and the cuff is expanded based on manometer and leakage is checked. Intervention 4: 4th Method: Modified standard method: This method is similar to the standard method except for the mask is moved in its paths without using any fingers.