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Table 2 Mean values for cardiorespiratory variables during the four 6-h periods studied

From: The acute effects of body position strategies and respiratory therapy in paralyzed patients with acute lung injury

   Manual turning +   Continuous rotation +
Cardiorespiratory variable Manual turning P&PD Continuous rotation P&PD
Mean VO2 (ml/min) 299 ± 88 323 ± 114 288 ± 79 302 ± 97
Mean VCO2 (ml/min) 269 ± 71 294 ± 69 260 ± 73 272 ± 77
Mean PIP (cmH2O) 38 ± 9 40 ± 9 36 ± 10 38 ± 8
Mean Pplat (cmH2O) 34 ± 7 37 ± 6 33 ± 6 34 ± 6
Mean Vt (ml) 733 ± 104 710 ± 119 751 ± 96 745 ± 113
Vd/Vt (%) 0.62 ± 0.18 0.63 ± 0.23 0.59 ± 0.18 0.64 ± 0.19
Cardiac output (litres/min) 7.4 ± 2.3 7.8 ± 2.7 7.1 ± 2.2 7.4 ± 2.7
Turns per 6 h 2.5 ± 0.4 3.0 ± 0.2 41 ± 8* 43 ± 20*
  1. Values are means ± SD of data recorded every hour for the study period, except Vd/Vt, which was every 3 h. PIP, peak inspiratory pressure; P&PD, percussion and postural drainage; Pplat, inspiratory plateau pressure; VO2, oxygen consumption; VCO2, CO2 production.