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Table 3 Effects of P&PD on sputum production, effects of percussion and postural drainage (P&PD) on oxygen consumption (VO2), and number of patient turns during the four 6-h study periods

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

   Manual turning +   Continuous rotation +
Variable Manual turning P&PD Continuous rotation P&PD
Sputum volume (ml) 13 ± 7 15 ± 5 23 ± 9* 25 ± 9*
Sputum volume, high production (ml) 18 ± 8 27 ± 13 26 ± 14 30 ± 11
Change in VO2 during P&PD (%) NA [+] 22 ± 8 NA [+] 7 ± 4
Turns per 6 h 2.5 ± 0.4 3.0 ± 0.2 41 ± 8 43 ± 10
  1. Sputum volume is the total volume for each 6-h period; high production refers to patients with a sputum production of more than 40 ml/day. NA, not applicable. Change in VO2 is the percentage change from previous period without P&PD. *, P < 0.05 versus manual turning periods. , P < 0.001 versus manual turning periods. , P < 0.05 versus times without P&PD.