ERcast: Clinical Perspectives Podcast Preview
The summary below is from an episode of ERcast: Clinical Perspectives
Mesenteric ischemia is a deadly abdominal pain diagnosis with highly variable presentations and mortality that rises with delayed recognition. The key emergency medicine move is to think beyond the classic “pain out of proportion” story, get CTA-based imaging early, and start resuscitation while surgery is mobilized.
Recognizing Mesenteric Ischemia Early
- Four mechanism framework: Mesenteric ischemia comes in four distinct forms—arterial embolism, arterial thrombosis, venous thrombosis, and non-occlusive disease—and the history changes meaningfully with each subtype.
- Classic presentation limits: Sudden severe pain out of proportion to exam fits embolic SMA ischemia, but more than a quarter of those patients still do not read like the textbook. We get into the bedside pattern recognition in the episode.
- Thrombotic pain pattern: Arterial thrombosis behaves like an ACS of the gut, with postprandial cramping, food fear, and weight loss after often extensive prior negative workups.
- Low flow red flags: Non-occlusive ischemia should move up the list in shock states such as sepsis, cardiogenic shock, or hemodialysis, where hypotension drives bowel hypoperfusion.
- Venous thrombosis clues: Mesenteric venous thrombosis is essentially a massive DVT of the gut, often affecting younger patients with cancer, recent surgery, prior VTE, or other hypercoagulable states.
Diagnosis and ED Management
- CTA over routine CT: Triphasic multidetector CT angiography is the test of choice, with sensitivity and specificity above 95%; a standard contrast CT with venous phase alone cannot exclude the diagnosis.
- Venous phase necessity: If triphasic imaging is unavailable, a CT angiogram plus an added venous phase is the practical alternative, and it should not wait on lab results.
- Labs cannot rule out: Lactate may be normal early because hepatic clearance can mask evolving ischemia, and D-dimer is too nonspecific to rescue the diagnosis when suspicion is real.
- Early ED treatment: Initial management is fluids, broad-spectrum antibiotics, and unfractionated heparin, treating bowel ischemia like a time-sensitive vascular emergency rather than an undifferentiated belly pain.
- Vasopressor caution: Avoid vasopressors when possible because intestinal vasospasm can worsen ischemia; the disposition hinge is early surgical consultation and rapid revascularization planning.
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References:
- Molyneux K, Beck-Esmay J, Koyfman A, Long B. High risk and low prevalence diseases: Mesenteric ischemia. Am J Emerg Med. 2023 Mar;65:154-161. Epub 2023 Jan 4. PMID: 36638612.
- Singh M, Long B, Koyfman A. Mesenteric Ischemia: A Deadly Miss. Emerg Med Clin North Am. 2017 Nov;35(4):879-888. PMID: 28987434
Faculty
- Matthew DeLaney, MD, FACEP, FAAEM
Dr. Matthew DeLaney is an emergency medicine physician and educator based in Birmingham, Alabama. A native of Mobile, he earned his medical degree from the University of South Alabama and completed his emergency medicine residency at Maine Medical Center.Dr. DeLaney has experience in both community and academic emergency medicine and is known for his commitment to teaching and medical education. He lives in Birmingham with his wife, Erin, who is also a physician, and their two daughters.
- Brit Long, MD
Dr. Brit Long is a Professor of Emergency Medicine at the University of Virginia and an emergency medicine physician with experience in both a community ED and at a military academic center ED. He is the Clinical Editor-in-Chief of emDOCs.His professional interests include medical education, evidence-based medicine, and the FOAMed movement. Outside of work, he enjoys spending time with his wife and two daughters
