Rescuer position | Over-head position | Straddle position | Standard position | All positions | ||||
---|---|---|---|---|---|---|---|---|
Technique data available | MTM n = 375 | PM n = 375 | MTM n = 375 | PM n = 375 | MTM n = 375 | PM n = 375 | MTMa n = 1,125 | PMa n = 1,125 |
Tidal volume 400–800 ml | n = 96 (25.6%) | n = 125 (33.3%) | n = 70 (18.7%) | n = 124 (33.1%) | n = 89 (23.7%) | n = 134 (35.7%) | n = 255 (22.7%) | n = 383 (34.0%) |
Tidal volume < 400 ml | n = 89 (23.7%) | n = 76 (20.3%) | n = 58 (15.5%) | n = 83 (22.1%) | n = 66 (17.6%) | n = 100 (26.7%) | n = 213 (18.9%) | n = 259 (23.0%) |
Tidal volume > 800 ml | n = 60 (16.0%) | n = 57 (15.2%) | n = 44 (11.7%) | n = 40 (10.7%) | n = 50 (13.3%) | n = 39 (10.4%) | n = 154 (13.7%) | n = 136 (12.1%) |
No volume detecteda | n = 130 (34.7%) | n = 117 (31.2%) | n = 203 (54.1%) | n = 128 (34.1%) | n = 170 (45.3%) | n = 102 (27.2%) | n = 503 (44.7%) | n = 347 (30.8%) |
Tidal volume | 400 ml ± 290 ml | 450 ml ± 290 ml | 390 ml ± 260 ml | 480 ml ± 240 ml | 400 ml ± 290 ml | 450 ml ± 220 ml | 400 ml ± 280 ml | 500 ml ± 250 ml |