Table 2.

Computed tomographic analysis of degrees of lung aeration of the whole lung

Parameter	PEEP	ZEEP	p
Lung volume, gas + tissue (ml)	3,372 ± 686	2,283 ± 549	<0.001
Functional residual capacity (ml)	2,035 ± 594	992 ± 450	<0.001
Volume of tissue (ml)	1,344 ± 315	1,296 ± 328	0.015
Overinflated lung volume (ml)	51 ± 121 (0–508)	4 ± 11(0–45)	<0.001
Normally aerated lung volume (ml)	2,476 ± 649	1,133 ± 640	<0.001
Poorly aerated lung volume (ml)	394 ± 224	597 ± 280	0.002
Nonaerated lung volume (ml)	451 ± 275 (123–1,213)	549 ± 342 (165–1,452)	0.001

ZEEP, zero end-expiratory pressure; PEEP, positive end-expiratory pressure of 15 cmH₂O. Results in parentheses are ranges.