Table 2.

Ventilatory setting, gas exchange, respiratory mechanics and hemodynamic variables at baseline

	Normal IAP (n = 10)	IAH (n = 10)	P value
Ventilatory setting
VT (ml/kg IBW)	5.3 ± 0.4	5.6 ± 0.3	0.178
RR, breaths/min	18 ± 3	16 ± 3	0.129
PEEP, cmH2O	9.1 ± 1.7	9.6 ± 1.8	0.532
Gas exchange
PaO2/FiO2	203 ± 51	180 ± 77	0.479
PaCO2, mmHg	44 ± 9	44 ± 9	0.875
PH	7.35 ± 0.09	7.39 ± 0.05	0.234
Mechanics
Pplat, cmH2O	23 ± 4	24 ± 4	0.623
Pes insp, cmH2O	18 ± 4	19 ± 3	0.378
Pes exp, cmH2O	12 ± 3	13 ± 4	0.554
Ptranspul insp, cmH2O	9 ± 5	8 ± 4	0.796
Ptranspul exp, cmH2O	0 ± 3	-1 ± 3	0.760
Estat, RS, cmH2O/l	32.3 ± 8.8	33.4 ± 8.7	0.774
Estat, L, cmH2O/l	20 ± 8.8	20 ± 7.6	0.988
Estat, CW, cmH2O/l	12.3 ± 3.7	13.4 ± 5.4	0.567
VexhaledZEEP, ml	236 ± 139	185 ± 98	0.402
Hemodynamics
HR, beats/min	89 ± 26	82 ± 24	0.545
MAP, mmHg	80 ± 13	76 ± 7	0.463
CI, l/min/m2	4.5 ± 1.6	3.4 ± 1.1	0.097
ITBVI, ml/m2	991 ± 334	1060 ± 163	0.562
EVLWI, ml/m2	10.7 ± 5.7	6.7 ± 1.9	0.059

Estat, CW = static chest wall elastance; Estat, L = static lung elastance; Estat, RS = static respiratory system elastance; EVLWI = extravascular lung water index; FiO2 = fraction of inspired oxygen; HR = heart rate; IAH = intra-abdominal hypertension; IAP = intra-abdominal pressure; IBW = ideal body weight; ITBVI = intrathoracic blood volume index; MAP = mean arterial pressure; PaCO2 = partial pressure of arterial carbon dioxide; PEEP = positive end-expiratory pressure; Pes insp = inspiratory esophageal pressure; Pes exp = expiratory esophageal pressure; Pplat = inspiratory plateau pressure; Ptranspulexp = expiratory transpulmonary pressure; Ptranspul insp = inspiratory transpulmonary pressure; RR = respiratory rate; Vexhaled ZEEP = exhaled volume from PEEP to zero end-expiratory pressure; V_T = tidal volume.

Data are presented as mean ± standard deviation.