What is the likely cause of severe abdominal pain, irregular pulse, and signs of intestinal distension in an emergency department patient?

• A. Atherosclerosis
• B. Embolization
• C. Hemorrhage
• D. Thrombosis

Answer: (B)

The presentation of severe abdominal pain accompanied by an irregular pulse and signs of intestinal distension is indicative of a critical vascular issue, often arising from an acute occlusion of the mesenteric circulation. In this scenario, embolization is the most likely cause.

Embolization refers to the obstruction of a blood vessel due to an embolus, which can originate from various sources such as a cardiac thrombus or plaque from atherosclerosis. When an embolus lodges in the mesenteric arteries, it disrupts blood flow to the intestines, leading to ischemia. The patient experiences severe abdominal pain as a result of the lack of blood supply, and the irregular pulse may suggest underlying cardiac involvement or instability reflecting systemic distress due to the compromised circulation.

Signs of intestinal distension can occur as the bowel becomes ischemic, leading to dysfunction in bowel motility and possibly resulting in paralytic ileus. This clinical picture aligns well with an acute mesenteric embolism, where the sudden interruption in blood flow manifests with these alarming symptoms.

While atherosclerosis, hemorrhage, and thrombosis can also be associated with vascular issues, they do not explain the acute and specific presentation observed in this case as effectively as embolization does. Atheros