Randomised Comparison of the AMBU AuraOnce Laryngeal Mask and the LMA Unique Laryngeal Mask Airway in Spontaneously Breathing Adults

Abstract

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.

Comparative efficacy and safety of the Ambu® AuraOnce™ laryngeal mask airway during general anaesthesia in adults: a systematic review and meta‐analysis

“…. Five clinical studies compared the AuraOnce with the LMA Classic; three studies compared the AuraOnce, LMA Unique and Soft Seal; and a further study compared the AuraOnce with the LMA Unique. Our risk of bias assessments are shown in Fig.…”

“…Four clinical trials compared the AuraOnce and the LMA Unique in adults. A pooled analysis from these four trials showed that the AuraOnce provided a higher oropharyngeal leak pressure (304 participants, mean (95% CI) difference 3.1 (1.6–4.7) cmH 2 O, p < 0.0001].…”

Complications Associated with the Use of Supraglottic Airway Devices in Perioperative Medicine

“…The typical incidence of blood on the i-gel at removal is between 4% and 13% [ 58 – 60 ] but has been reported to be as high as 20%, albeit in novice users [ 61 ]. The AuraOnce laryngeal mask was associated with a very low (2%) incidence of blood staining after its removal [ 62 ] but reached 10% in another study [ 63 ]. The presence of blood on the Cobra airway may be as high as 50% [ 64 ].…”

Comparative study of the Ambu® AuraOnce™ laryngeal mask and endotracheal intubation in anesthesia airway management during neurosurgery

“…The insertion time and success rate of the first and final LMA insertion attempts were reported to be between 11.2AE2.7 and 27.0AE10.0 seconds in previous studies. [25][26][27] Studies showed that the success rate of the first insertion attempt ranged from 83% to 92.5% [25][26][27] in adults and 93% to 100% 7,25,27,28 in children, while the success rate of final insertion was an average of 98%. 26,29 In the present study, the LMA insertion time was 35.6 AE 7.1 seconds, which is slightly longer than that of the ETI (31.2 AE 6.0 seconds).…”