A retrospective study was performed on 38 patients (23 males and 15 females) in whom the intubating laryngeal mask airway (ILMA) was used for airway management at Srinagarind and Siriraj Hospital in 2003. The patients’ age and weight ranged between 12 and 75 years and 40 and 94 kg, respectively. Difficult tracheal intubation was suspected before starting general anesthesia in 17 patients, whereas it was found difficult after induction of general anesthesia in 21.
The ILMA was successfully placed in all patients with airway patency classified as ‘good’ and ‘acceptable’ in 36 patients (94.7%), and ‘poor’ in two. Oxygen saturation during intubation was maintained above 95 percent in all patients. Tracheal intubation through the ILMA was successful in 34 patients (89.5%), which was described as ‘easy’ in 27 of 34 patients (79.4%). In the remaining 7, 2-5 attempts were required for successful tracheal intubation. The types of endotracheal tubes used were: 1) the pre-formed silicone tube in 55.9 percent, 2) the pre-formed flexible tube in 41.2 percent; and, 3) the standard polyvinyl tube in 2.9 percent. In the four patients with failed tracheal intubation through the ILMA, three were successfully intubated with conventional laryngoscopy and one with gum elastic bougie. There were no serious complications following the use of the ILMA in these patients. The ILMA proved a safe, very useful and easy to use device with a high success rate for difficult airway management.
Keyword : Intubating laryngeal mask airway, Difficult airway management, Endotracheal tube