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 2 Characteristics of IAH and non-IAH critically ill patients

	Total (n= 50	IAH (n= 6)	Non-IAH (n= 44)	p value
Female (n)	24 (48.0)	1 (16.7)	23 (52.3)	0.192^a
Age (years)	45.9 ± 15.5	51.7 ± 7.6	45.1 ± 16.1	0.289^b
BMI (kg/m²)	24.2 ± 3.5	26.5 ± 4.4	23.9 ± 3.2	0.199^b
APACHE II	9.2 ± 5.4	9.7 ± 4.9	9.2 ± 5.5	0.753^b
IAP	6.7 ± 4.1	14.9 ± 3.2	5.6 ± 2.8	<0.000 ^b
APP	85.3 ± 21.7	70.3 ± 23.1	87.3 ± 21.0	0.078^b
MV	50 (100)	6	44
Medical	26 (52.0%)	3 (50.0%)	23 (52.3%)	1.000^a
Surgical	24 (48.0%)	3 (50.0%)	21 (47.7%)
Elective	18 (36.0%)	3 (50.0%)	15 (34.1%)	^c
Emergency	2 (4.0%)	0 (0.0%)	2 (4.5%
Trauma	5 (10.0%)	0 (0.0%)	5 (11.4%)
ICU stay	6.5 ± 6.5	5.8 ± 5.2	6.6 ± 6.7	0.940^b
ICU mortality	32 (64.0%)	4 (66.7%)	28 (63.6%)	1.000^a

^aFisher's exact test; ^bMann-Whitney U test; ^c p value was not calculated as the expected frequency was <5 in more than 25% of the cells. IAH, intra-abdominal hypertension; BMI, body mass index; APACHE, Acute Physiology and Chronic Health Evaluation; IAP, intra-abdominal pressure; APP, abdominal perfusion pressure; MV, mechanical ventilation; ICU, intensive care unit.