. 2020 Oct 1;10:130. doi: 10.1186/s13613-020-00746-9

Table 1.

Definitions of IAH, IAH grades and ACS

	Definition
Intra-abdominal Hypertension (IAH)	Sustained intra-abdominal pressure (IAP) ≥ 12 mmHg^a
IAH grade I	IAP 12–15 mmHg^a
IAH grade II	IAP 16–20 mmHg^a
IAH grade III	IAP 21–25 mmHg^a
IAH grade IV	IAP > 25 mmHg^a
IAH at admission	First and second IAP measurements after admission were ≥ 12 mmHg
Abdominal Compartment Syndrome (ACS)	Sustained IAP > 20 mmHg associated with new organ dysfunction or failure^a

^a[4]