The AMBU® Aura-i™ Laryngeal Mask and LMA Supreme™: A Randomized Trial of Clinical Performance and Fibreoptic Positioning in Unparalysed, Anaesthetised Patients by Novices

Table 2

Airway insertion characteristics and performance of airway devices. Values are expressed as mean (SD) or numbers of patients () and percentages (%).

	AMBU Aura-i; ()	LMA Supreme; ()	value
Size of airway used: 3/4/5	11/39/0	7/43/0	0.436
Number of insertion attempts, (%)
1	43 (86.0%)	44 (88.0%)	0.591
2	5 (10.0%)	6 (12.0%)
3	2 (4.0%)	0
Reported ease of insertion, (%)
1 = easy	40 (80.0%)	42 (88.0%)	0.792
2 = not so easy	6 (12.0%)	6 (12.0%)
3 = difficult	4 (8.0%)	2 (4.0%)
4 = very difficult	0	0
5 = impossible	0	0
Time to successful airway insertion,	18.2 (6.0)	17.3 (6.4)	0.900
Cuff volume at 60 cmH2O, mL	17.7 (3.5)	23.1 (4.4)	<0.001
Manoeuvres to optimize ventilation
None	37 (74.0%)	42 (84.0%)	0.784
Adjusting head/neck position	4 (8.0%)	3 (6.0%)
Changing depth of insertion	1 (2.0%)	0
Applying jaw lift	1 (2.0%)	1 (2.0%)
Reinserting the device	7 (4.0%)	4 (8.0%)
Changing device size	0	0
Oropharyngeal leak pressure, cmH2O	28.8 (7.1)	27.2 (5.3)	0.240
Leak pressure <20 cmH2O, (%)	8 (16.0%)	1 (2.0%)	0.031
Air leak into stomach at OLP
Yes : No	4 (8.0%) : 46 (92.0%)	1 (2.0%) : 49 (98.0%)	0.362
Fiberoptic view
0 = cannot function, no cord seen	0	NA
1 = cords not seen but function adequate	5 (10.0%)
2 = cords plus anterior epiglottis seen	34 (68.0%)
3 = cords plus posterior epiglottis seen	10 (20.0%)
4 = only cords seen	1 (2.0%)

^†Defined as time from insertion of airway device into patient’s mouth to the first end-tidal carbon dioxide trace.