intra-abdominal hypertension (IAH) and delirium are serious, high-frequency complications in intensive care unit (ICU) patients. The consequences of the complication range from high morbidity and mortality to a greater need for nursing care. We hypothesize that there could be a correlation between IAH and incidence of delirium.

Inclusion Criteria:

• Patients of both genders on mechanical ventilation

Exclusion Criteria:

• age under 18 years, use of muscle relaxants, abdominal operation within the previous 3 months, acute peritonitis, and abdominal mass, acute injury to the urinary bladder, acute cystitis, neurogenic bladder, pelvic hematoma, and pelvic fracture.

60 critically ill patients that remained more than 48 hours at trauma and general ICU without apparent risk factors for IAH other than the use of MV