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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