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Table 2 Lung volume and intraabdominal pressure during continuous positive-pressure ventilation and continuous external negative-pressure ventilationa

From: Negative- versus positive-pressure ventilation in intubated patients with acute respiratory distress syndrome

  Tidal volume (ml) Minute volume
(L/minute)
  Lung volume
at end expiration (ml)
Intraabdominal pressure
(mmHg)
Patient CPPV CENPV CPPV CENPV Respiratory rate (breaths/minute) CPPV CENPV CPPV CENPV
1 583 578 10.5 10.4 18 612 623 22 4
2 411 417 7.4 7.5 18 623 607 28 5
3 550 559 12.1 12.3 22 937 927 12 -6
4 494 506 8.4 8.6 17 710 722 30 5
5 437 426 8.3 8.1 19 545 530 13 -2
6 560 568 14 14.2 25 667 650 19 -7
Mean ± SD 506 ± 70 509 ± 72 10.1 ± 2.6 10.2 ± 2.6 19.8 ± 3.1 682 ± 137 677 ± 138 21 ± 8 0 ± 6*
  1. aCENPV, continuous external negative-pressure ventilation; CPPV, continuous positive-pressure ventilation. Patient 6 had an open abdomen. *P = 0.03 compared to CPPV.