Table 1.

Effects of pneumoperitoneum and PEEP on elastance

	PEEP = 0 cmH2O			PEEP = 7 cmH2O
	Pre	Pneumo	P Value	Pre	Pneumo	P Value
Ers	29.6 (11.2)	42.9 (11.9)	<.0001	27.7 (14.7)	38.7 (12.9)‡	<0.0001
El	20.0 (12.2)	21.6 (10.1)	0.253	19.0 (15.2)	19.6 (11.9)	0.66
Ecw	10.5 (3.8)	21.4 (4.6)	<.0001	9.0 (3.7)*	18.2 (6.1)†	<0.0001

Values are means (SD) in cmH₂O/l. Ers, respiratory elastance; El, lung elastance; Ecw, chest wall elastance; PEEP, positive end-expiratory pressure; Pneumo, pneumoperitoneum; Pre, pre-pneumoperitoneum. Elastance difference at 7-cmH₂O PEEP from that at 0-cmH₂O PEEP:

^*P < 0.02, †P < 0.01,

^‡P < 0.0001.