Background: The Laryngeal Tube Suction Disposable (LTS-D) and the Supreme Laryngeal Mask Airway (SLMA) are\nsecond generation supraglottic airway devices (SADs) with an added channel to allow gastric drainage. We studied\nthe efficacy of these devices when using pressure controlled mechanical ventilation during general anesthesia for\nshort and medium duration surgical procedures and compared the oropharyngeal seal pressure in different head\nand-neck positions.\nMethods: Eighty patients in each group had either LTS-D or SLMA for airway management. The patients were\nrecruited in two different institutions. Primary outcome variables were the oropharyngeal seal pressures in neutral,\nflexion, extension, right and left head-neck position. Secondary outcome variables were time to achieve an effective\nairway, ease of insertion, number of attempts, maneuvers necessary during insertion, ventilatory parameters, success\nof gastric tube insertion and incidence of complications.\nResults: The oropharyngeal seal pressure achieved with the LTS-D was higher than the SLMA in, (extension (p=0.0150)\nand right position (p=0.0268 at 60 cm H2O intracuff pressures and nearly significant in neutral position (p = 0.0571). The\noropharyngeal seal pressure was significantly higher with the LTS-D during neck extension as compared to\nSLMA (p= 0.015). Similar oropharyngeal seal pressures were detected in all other positions with each device. The\nsecondary outcomes were comparable between both groups. Patients ventilated with LTS-D had higher\nincidence of sore throat (p = 0.527). No major complications occurred.\nConclusions: Better oropharyngeal seal pressure was achieved with the LTS-D in head-neck right and extension\npositions , although it did not appear to have significance in alteration of management using pressure control\nmechanical ventilation in neutral position. The fiberoptic view was better with the SLMA. The post-operative\nsore throat incidence was higher in the LTS-D.
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