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Anesthesiol Res Pract. 2012; 2012: 405812.
Published online Feb 29, 2012. doi:  10.1155/2012/405812
PMCID: PMC3299248
Randomised Comparison of the AMBU AuraOnce Laryngeal Mask and the LMA Unique Laryngeal Mask Airway in Spontaneously Breathing Adults
Daryl Lindsay Williams, * James M. Zeng, Karl D. Alexander, and David T. Andrews
Department of Anaesthesia and Pain Management, Royal Melbourne Hospital, Parkville 3050, Australia
*Daryl Lindsay Williams: daryl.williams/at/
Academic Editor: Michael R. Frass
Received August 24, 2011; Revised December 21, 2011; Accepted December 23, 2011.
We conducted a randomised single-blind controlled trial comparing the LMA-Unique (LMAU) and the AMBU AuraOnce (AMBU) disposable laryngeal mask in spontaneously breathing adult patients undergoing general anaesthesia. Eighty-two adult patients (ASA status I–IV) were randomly allocated to receive the LMAU or AMBU and were blinded to device selection. Patients received a standardized anesthetic and all airway devices were inserted by trained anaesthetists. Size selection was guided by manufacturer recommendations. All data were collected by a single, unblinded observer. When compared with the LMAU, the AMBU produced significantly higher airway sealing pressures (AMBU 20 ± 6; LMAU 15 ± 7 cm H2O; P = 0.001). There was no statistical difference between the two devices for overall success rate, insertion time, number of adjustments, laryngeal alignment, blood-staining, and sore throat (P ≥ 0.05). The AMBU AuraOnce disposable laryngeal mask provided a higher oropharyngeal leak pressure compared to the LMA Unique in spontaneously breathing adult patients.
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