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.