Table 2.
Airway insertion characteristics and performance of airway devices. Values are expressed as mean (SD) or numbers of patients (n) and percentages (%).
| AMBU Aura-i (n = 50) |
LMA Supreme (n = 50) |
p value | |
|---|---|---|---|
| Size of airway used: 3/4/5 | 11/39/0 | 7/43/0 | 0.436 |
| Number of insertion attempts, n (%) | |||
| 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, n (%) | |||
| 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, s† | 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, n (%) | 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.