LARYNGEAL MASK AIRWAY - A MORE SUCCESSFUL METHOD OF INSERTION

Study Objective: To compare the ease of insertion of the laryngeal mas k airway (LMA) by two methods. Design: Prospective, randomized study. Setting: Operating room of a university-affiliated teaching hospital. Patients: 350 ASA I, II, and III patients undergoing general anesthesi a, in whom use of the LMA was not contraindicated. Interventions: With all routine monitors in place and after the induction of anesthesia w ith propofol, we compared the ease of insertion of the LMA in the two groups of 175 patients each. The timing of insertion was made on clini cal grounds. In one group, the LMA was inserted with the cuff fully de flated, in the other group, the cuff was partially inflated (i.e., fil led with half the recommended air in the cuff). When correct placement of the mask was not successful by one method, the other method was tr ied and the insertion graded in the same manner. Measurements and Main Results: The ease of insertion of the LMA was graded by the user on a scale of 1-4. Insertion of the LMA with the cuff partially inflated w as significantly more successful (97.7%) than when the cuff was fully deflated (92%) (p < 0.05). When correct placement of the mask was not possible with the cuff fully deflated, partial inflation resulted in c orrect placement. Conclusions: Inserting the LMA with the cuff partial ly inflated is likely to be more successful than with the cuff fully d eflated. When it is not possible to insert the LMA with the cuff fully deflated, partial inflation before insertion may result in correct pl acement.