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

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