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Normal IAP 5-7 mmHg — FRCA Primary MCQ

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ModeratePhysiology - Gastrointestinal & HepaticNormal IAP 5-7 mmHgFRCA Primary

Intra-abdominal pressure is normally:

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Correct answer: E — 5-7 mmHg

Normal intra-abdominal pressure (IAP) is approximately 5-7 mmHg (up to 12 mmHg in obese/critically ill patients). IAP >12 mmHg = intra-abdominal hypertension (IAH). IAP >20 mmHg with organ dysfunction = abdominal compartment syndrome. Elevated IAP reduces: venous return / renal perfusion / respiratory compliance / and splanchnic blood flow.

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist