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Table 2 Portion of insufficient, low-volume, guideline-conform and high-volume ventilations and mean tidal volume during initial rescue breaths and five consecutive CPR cycles

From: CPR with restricted patient access using alternative rescuer positions: a randomised cross-over manikin study simulating the CPR scenario after avalanche burial

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
  1. Data for tidal volume given as mean and standard deviation of mean
  2. MTM, mouth-to-mouth ventilation; PM, pocket mask ventilation
  3. aAttempts at ventilation in which participants provided a tidal volume too small to be detected by the manikin