Delivered test lung respiratory data, device insertion failures and device insertion rating
| Primary outcomes | Secondary outcomes | ||||||
| Mask leak,* % | PEEP,* cmH2O | PIP,* cmH2O | Inflation volume,* mL | Max PIP,*‡ cmH2O | LM insertion† Failures, no failure/partial/complete | LM insertion† Easy/Difficult | |
| Estimated mean (SE) | Estimated mean (SE) | Estimated mean (SE) | Estimated mean (SE) | Estimated mean (SE) | |||
| Face mask | |||||||
| M1. Triangular | 43.0 (0.44) | 3.0 (0.04) | 22.7 (0.18) | 28.1 (0.19) | 29.5 (0.87) | 40/0/0 | 40/0 |
| M2. Round | 34.9 (0.39) | 3.6 (0.04) | 25.5 (0.16) | 31.3 (0.17) | 31.6 (0.80) | 40/0/0 | 40/0 |
| Laryngeal mask | |||||||
| 1. Ultimate | 48.8 (0.38) | 2.2 (0.03) | 20.6 (0.16) | 30.3 (0.17) | 25.5 (0.84) | 36/2/2 | 34/6 |
| 2. PRO-Breathe | 64.7 (0.40) | 1.3 (0.04) | 16.5 (0.16) | 25.4 (0.17) | 20.9 (0.81) | 33/6/1 | 26/14 |
| 3. Supreme | 46.2 (0.37) | 2.4 (0.03) | 22.0 (0.15) | 29.0 (0.16) | 29.2 (0.81) | 37/3/0 | 38/2 |
| 4. Unique | 64.5 (0.40) | 0.7 (0.04) | 14.3 (0.16) | 27.2 (0.18) | 18.5 (1.01) | 26/9/5 | 27/13 |
| 5. air-Q | 58.5 (0.39) | 1.0 (0.04) | 16.8 (0.16) | 28.9 (0.17) | 22.4 (0.83) | 28/12/0 | 25/15 |
| 6. AuroOnce | 62.2 (0.41) | 0.7 (0.04) | 17.0 (0.17) | 29.7 (0.18) | 19.5 (0.83) | 28/7/5 | 16/24 |
| 7. i-gel | 4.0 (0.42) | 4.8 (0.04) | 29.5 (0.17) | 34.5 (0.19) | 36.7 (0.95) | 40/0/0 | 40/0 |
*Parameters significant at p<0.001, analysis of variance for repeated measures, estimated means with SE.
†Frequency counts for LMA only tested, Fisher’s exact test, p<0.001.
‡Averaged four maximal inflations to achieve highest possible PIP.
LM, laryngeal mask; PEEP, positive end expiratory pressure; PIP, peak inspiratory pressure.