Abdominal compartment syndrome (ACS) is defined by sustained intra-abdominal pressure greater than 20 mm Hg with new organ failure. Which option best matches this definition?

Abdominal compartment syndrome (ACS) is defined by sustained intra-abdominal pressure greater than 20 mm Hg with new organ failure. Which option best matches this definition?

• A. Greater than 20 mm Hg with new organ failure
• B. Greater than 25 mm Hg with any organ impairment
• C. Greater than 15 mm Hg with hemodynamic instability
• D. Greater than 20 mm Hg with preexisting organ dysfunction

Answer: (A)

Abdominal compartment syndrome is defined by a pressure inside the abdomen that is elevated above a critical threshold and, crucially, causes new organ dysfunction. The important point is that the organ failure must be new, signaling an acute problem caused by the increased pressure rather than a preexisting condition. Therefore, the best match is the description that states intra-abdominal pressure greater than 20 mm Hg with new organ failure. The 20 mm Hg threshold reflects when perfusion to abdominal and other organs begins to be compromised. The emphasis on “new” organ dysfunction distinguishes ACS from cases where organ impairment was already present before the pressure rise. Why the other descriptions aren’t correct: a higher threshold (like 25 mm Hg) with any organ impairment doesn’t specifically require new dysfunction, and 25 mm Hg isn’t the established diagnostic threshold. A value of 15 mm Hg is below the diagnostic level, even if instability is present. And a pressure of 20 mm Hg with preexisting organ dysfunction lacks the necessary new organ failure that defines ACS.

Abdominal compartment syndrome is defined by a pressure inside the abdomen that is elevated above a critical threshold and, crucially, causes new organ dysfunction. The important point is that the organ failure must be new, signaling an acute problem caused by the increased pressure rather than a preexisting condition.

Therefore, the best match is the description that states intra-abdominal pressure greater than 20 mm Hg with new organ failure. The 20 mm Hg threshold reflects when perfusion to abdominal and other organs begins to be compromised. The emphasis on “new” organ dysfunction distinguishes ACS from cases where organ impairment was already present before the pressure rise.

Why the other descriptions aren’t correct: a higher threshold (like 25 mm Hg) with any organ impairment doesn’t specifically require new dysfunction, and 25 mm Hg isn’t the established diagnostic threshold. A value of 15 mm Hg is below the diagnostic level, even if instability is present. And a pressure of 20 mm Hg with preexisting organ dysfunction lacks the necessary new organ failure that defines ACS.