Effect of mechanical ventilation on intra-abdominal pressure in critically ill patients without other risk factors for abdominal hypertension: an observational multicenter epidemiological study

Annals of Intensive Care

Table 1 Characteristics of the critically ill patients in the mechanically ventilated and non-ventilated groups

	Total (n= 100)	MV (n= 50)	Non-MV (n= 50)	p value
Female (n)	50	24 (48%)	26 (52%)	0.841^a
Age (years)	46.6 ± 17.0	45.9 ± 15.5	47.3 ± 18.6	0.666^b
BMI (kg/m²)	24.3 ± 3.5	24.2 ± 3,5	24.3 ± 3.6	0.893^b
APACHE II	8.5 ± 4.7	9.2 ± 5.4	7.8 ± 3.8	0.125^b
IAP	5.1 ± 3.7	6.7 ± 4.1	3.5 ± 2.4	<0.0001 ^b
APP	87.7 ± 17.6	85.3 ± 21.7	90.1 ± 11.9	0.173^b
IAH	6	6 (12.0)	0 (0.0%)	0.027 ^c
Medical	53 (53.0)	26 (52.0%)	27 (54%)	1.000
Surgical	47 (47.0)	24 (48.0%)	23 (46.0%)
Elective	31 (66.0%)	18 (72.0%)	13 (59.1%)	^d
Emergency	5 (10.6%)	2 (8.0%)	3 (13.6%)
Trauma	11 (23.4%)	5 (20.0%)	6 (27.3%)
ICU stay	5.6 ± 5.5	6.5 ± 6.5	4.6 ± 4.3	0.087^b
ICU mortality	21 (21.0%)	18 (36.0%)	3 (6.0%)	<0.0001 ^c

^aChi-square test with Yates' correction; ^btwo independent sample t tests; ^cFisher's exact test; ^d p value was not calculated as the expected frequency was <5 in more than 25% of the cells. MV, mechanical ventilation; BMI, body mass index; APACHE, Acute Physiology and Chronic Health Evaluation; IAP, intra-abdominal pressure; APP, abdominal perfusion pressure; IAH, intra-abdominal hypertension; ICU, intensive care unit.