Correlation and variation of cuff inflating volumes and pressures in different adult models of laryngeal mask: a prospective randomized trial

Abstract

Background: Hyperinflation of laryngeal mask cuffs may carry the risk of airway complications. The manufacturer recommends inflating cuff until the intracuff pressure reaches 60 cmH 2 O, or inflate with the volume of air to not exceed the maximum recommended volume. We prospectively assessed the correlation of cuff inflating volumes and pressures, and the appropriated the cuff inflating volumes to generate an intracuff pressure of 60 cmH 2 O in the adult laryngeal masks from different manufacturers. Methods: Two groups of 80 patients requiring laryngeal mask size 3 and 4 during general anesthesia were randomized into 4 subgroups for each size of the laryngeal mask: Soft Seal® (Portex®), AuraOnce™ (Ambu®), LMA-Classic™ (Teleflex®) and LMA-ProSeal™ (Teleflex®). After insertion, the cuff was inflated with 5-ml increments of air up to the maximum recommended volume. After each 5-ml intracuff pressure was measured, the volume of air that generated the intracuff pressure of 60 cmH 2 O was recorded. Results: Mean (SD) volume of air required to achieve the intracuff pressure of 60 cmH 2 O in

Efficacy and safety of three inflation methods of the laryngeal mask airway Ambu® Auraonce™: a randomized controlled study

“…The mean of nal cuff volume of size 4 (12.7 ±2.3 mL) and 5 (17.4 ± 4.8 mL) to obtain an optimum intracuff pressure and sealing of Auraonce LMAs are not signi cantly different from the half of the maximum recommended volume (15mL for size 4 and 20mL for size 5) by the manufacturer and corresponds to the in ated volume we used in patients in the MV group. These results are in agreement with previous studies of pressure and volume correlation [21][22]24].…”

“…Approximately half of the recommended maximum volume produced a cuff pressure above the recommended pressure of 60 cmH 2 O in pediatric patients [21][22]. However, only 2 adult [23][24] and 3 pediatric studies [21,22,25] were performed so far, assessing cuff in ating volumes and pressures of LMAs.…”