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Table 1 Definitions

From: Abdominal Compartment Syndrome: pathophysiology and definitions

Definition 1 IAP is the steady-state pressure concealed within the abdominal cavity.
Definition 2 APP = MAP - IAP
Definition 3 FG = GFP - PTP = MAP - 2 * IAP
Definition 4 IAP should be expressed in mmHg and measured at end-expiration in the complete supine position after ensuring that abdominal muscle contractions are absent and with the transducer zeroed at the level of the mid-axillary line.
Definition 5 The reference standard for intermittent IAP measurement is via the bladder with a maximal instillation volume of 25 mL of sterile saline.
Definition 6 Normal IAP is approximately 5–7 mmHg in critically ill adults.
Definition 7 IAH is defined by a sustained or repeated pathologic elevation of IAP ≥ 12 mmHg.
Definition 8 IAH is graded as follows:
     • Grade I: IAP 12–15 mmHg
     • Grade II: IAP 16–20 mmHg
     • Grade III: IAP 21–25 mmHg
     • Grade IV: IAP > 25 mmHg
Definition 9 ACS is defined as a sustained IAP > 20 mmHg (with or without an APP < 60 mmHg) that is associated with new organ dysfunction/failure.
Definition 10 Primary ACS is a condition associated with injury or disease in the abdomino-pelvic region that frequently requires early surgical or interventional radiological intervention.
Definition 11 Secondary ACS refers to conditions that do not originate from the abdomino-pelvic region.
Definition 12 Recurrent ACS refers to the condition in which ACS redevelops following previous surgical or medical treatment of primary or secondary ACS.
  1. Consensus definitions as proposed by the International Conference of Experts on Intra-abdominal Hypertension and Abdominal Compartment Syndrome.