Question:
An elderly man with a history of atrial fibrillation presents with sudden severe abdominal pain that is out of proportion to physical findings. Which laboratory finding most strongly supports the diagnosis of acute mesenteric ischemia?
An elderly man with a history of atrial fibrillation presents with sudden severe abdominal pain that is out of proportion to physical findings. Which laboratory finding most strongly supports the diagnosis of acute mesenteric ischemia?
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Dying gut means anaerobic metabolism - look at the lactate.
Updated On: Jun 25, 2026
- Raised serum lactate (and LDH)
- Raised serum amylase only
- Hypocalcaemia
- Raised serum bilirubin
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The Correct Option is A
Solution and Explanation
Step 1: Identify the clinical scenario.
Atrial fibrillation predisposes to embolism; an embolus lodging in the superior mesenteric artery causes acute mesenteric ischemia. The hallmark is pain out of proportion to the examination findings.
Step 2: Understand the biochemistry.
Ischaemic bowel undergoes anaerobic metabolism and cell death, releasing lactate and lactate dehydrogenase (LDH). A raised serum lactate (metabolic acidosis with high anion gap) is the most useful and characteristic biochemical marker, and LDH rises with tissue necrosis.
Step 3: Eliminate the distractors.
Amylase may rise modestly but is non-specific (also raised in pancreatitis). Hypocalcaemia and hyperbilirubinaemia are not features of early mesenteric ischemia.
Key fact: AF + pain out of proportion + raised lactate/LDH = acute (embolic) mesenteric ischemia; CT angiography confirms it.
Atrial fibrillation predisposes to embolism; an embolus lodging in the superior mesenteric artery causes acute mesenteric ischemia. The hallmark is pain out of proportion to the examination findings.
Step 2: Understand the biochemistry.
Ischaemic bowel undergoes anaerobic metabolism and cell death, releasing lactate and lactate dehydrogenase (LDH). A raised serum lactate (metabolic acidosis with high anion gap) is the most useful and characteristic biochemical marker, and LDH rises with tissue necrosis.
Step 3: Eliminate the distractors.
Amylase may rise modestly but is non-specific (also raised in pancreatitis). Hypocalcaemia and hyperbilirubinaemia are not features of early mesenteric ischemia.
Key fact: AF + pain out of proportion + raised lactate/LDH = acute (embolic) mesenteric ischemia; CT angiography confirms it.
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