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

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

	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*

^aCENPV, continuous external negative-pressure ventilation; CPPV, continuous positive-pressure ventilation. Patient 6 had an open abdomen. *P = 0.03 compared to CPPV.

ISSN: 1364-8535