IAH - intra-abdominal hypertension: is the pathologic elevation of IAP. IAH is defined by a sustained or repeated IAP > 12 mmHg or an APP < 60 mmHg.
ACS - abdominal compartment syndrome
IAP - intra-abdominal pressure: is the pressure concealed within the abdominal cavity. IAP varies with respiration. The normal adult IAP is around 5mmHg, but can be non-pathologically increased in the obese. Elevated IAP is a common finding among critically ill medical and surgical patients.
APP - abdominal perfusion pressure (MAP-IAP) > 60 mmHg assesses not only the severity of IAP, but also the adequacy of the patient’s systemic perfusion. APP = mean arterial pressure (MAP) – IAP.
Primary ACS - conditions associated with injury or disease in the abdomino-pelvic region requiring emergent surgical or angioradiological intervention (damage control laparotomy, bleeding pelvic fractures, massive retroperitoneal hematomas, failed nonoperative management) or following elective abdominal surgery (secondary peritonitis, liver transplantation)
Secondary ACS - ACS due to conditions that do not originate from the abdomino-pelvic region (sepsis, capillary leak, major burns, other conditions requiring massive fluid resuscitation).
Recurrent ACS - The condition in which ACS redevelops following previous surgical or medical treatment of primary or secondary ACS or following closure of a previous decompressive laparotomy