By elham rabiee

 Abdominal compartment syndrome refers to organ dysfunction caused by intraabdominal hypertension. Intraabdominal hypertension (IAH) and abdominal compartment syndrome (ACS) are distinct clinical entities and should not be used interchangeably.

 intra-abdominal pressure(IAP) :This is the pressure within the abdominal cavity,5 – 7 mmHg is normal in a critically ill adult.  Intraabdominal hypertension (IAH): is defined as a sustained intraabdominal pressure ≥12 mmHg

 Hyper acute IAH: laughing, coughing, straining, sneezing, defecation, or physical activity.  Acute IAH: trauma or intraabdominal hemorrhage.  Subacute IAH:medical patients  Chronic IAH:pregnancy

 Abdominal compartment syndrome:is defined as a sustained intraabdominal pressure >20 mmHg that is associated with new organ dysfunction.

 Most studies evaluating the incidence of ACS were done in trauma patients, with estimates of incidence varying considerably.

 Trauma  Burns  Liver transplantation  Abdominal conditions(Massive ascites, bowel distension, abdominal surgery, or intraperitoneal bleeding)  Post-surgical patients

 Cardiovascular: Impaired cardiac function Reduced venous return

 Pulmonary Reduced lung compliance secondary to diaphragmatic elevation Hypoventilation Increased work of breathing Hypoxia and hypercarbia Mechanical ventilation often required

 Renal Increased IAH leads to decreased renal blood flow › Oliguria may be observed with IAP of › An IAP of >30 leads to anuria

 Gastrointestinal: Mesenteric blood flow was reduced Intestinal ischemia

 Central Nervous System: Decreased cerebral outflow of blood Increased intracranial pressure

 Symptoms :The rare patient who is able to convey symptoms may complain of malaise, weakness, lightheadedness, dyspnea,abdominal pain.  Physical signs: distended abdomen, Progressive oliguria,hypotension, tachycardia, an elevated jugular venous pressure, peripheral edema, abdominal tenderness.

 Measurement of intraabdominal pressure  The drainage tube of the patient's Foley (bladder) catheter is clamped.  Sterile saline (up to 60 mL) is instilled into the bladder via the aspiration port of the Foley catheter and the catheter filled with fluid.  An 18-gauge needle attached to a pressure transducer is inserted into the aspiration port. With some newer style Foley catheters, this can be done using a needle-less connection system.  The pressure is measured at end-expiration in the supine position after ensuring that abdominal muscle contractions are absent. The transducer should be zeroed at the level of the midaxillary line.

 Ventilatory support  Hemodynamic support

 Surgical decompression for all patients whose intraabdominal pressure is greater than 25 mmHg  Many clinicians suggest surgical decompression at a lower intraabdominal pressure (eg, 15 to 25 mmHg)  Other clinicians believe that the need for surgical decompression should be determined by the abdominal perfusion pressure (APP)

 Failure to recognize IAH prior to the development of ACS causes tissue hypoperfusion, which may lead to multisystem organ failure, and potentially death. Mortality estimates for patients with ACS range from 40 to 100 percent.

 This research was a descriptive– analytical study conducted on 100 patients. IAP was monitored every 4 h in patients suspected to be at high risk for ACS, e.g., those undergoing severe abdominal trauma and pelvic fracture. The IAP was measured via the urinary bladder.

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