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Difficulty: EasyPhysical Examination Findings

A 65-year-old woman is brought to the emergency department due to the abrupt onset of severe, diffuse abdominal pain that began two hours ago. Her past medical history is notable for paroxysmal atrial fibrillation, but she reports running out of her apixaban prescription one week ago. Her temperature is 37.1°C (98.8°F), blood pressure is 142/88 mmHg, pulse is 115/min and irregularly irregular, and respirations are 22/min. On physical examination, her abdomen is soft, non-distended, and exhibits only mild, diffuse tenderness to deep palpation. There is no guarding, rigidity, or rebound tenderness. Bowel sounds are hypoactive. Despite these remarkably benign objective abdominal findings, the patient is writhing on the stretcher, crying out in agony, and repeatedly requesting pain medication. Based on this specific pattern of physical examination findings, which of the following is the most likely diagnosis?

  1. Acute mesenteric ischemiaAnswer
  2. B
    Perforated peptic ulcer
  3. C
    Acute severe pancreatitis
  4. D
    Acute appendicitis
  5. E
    Ruptured abdominal aortic aneurysm

Answer

Acute mesenteric ischemia
The most likely diagnosis is acute mesenteric ischemia. The defining hallmark of this condition on physical examination is severe, acute-onset abdominal pain that is strikingly disproportionate to the relatively benign objective findings (a soft, non-distended abdomen with minimal tenderness and an absence of peritoneal signs). The patient's history of atrial fibrillation combined with medication nonadherence provides the classic setup for an embolic event to the superior mesenteric artery.

Step-by-Step Solution

1
Analyze the patient's historical risk factors.
The patient has atrial fibrillation and is currently unanticoagulated, which places her at extremely high risk for systemic thromboembolism.
Identifying the underlying risk factor helps narrow the differential diagnosis for sudden-onset abdominal pain.
2
Evaluate the objective physical examination findings in the context of the patient's subjective symptoms.
The patient subjectively reports agonizing pain and appears in distress, yet the objective abdominal examination reveals a soft, non-distended abdomen without peritonitis.
The discrepancy between the subjective severity of pain and the benign physical exam is the hallmark clinical finding of a specific vascular catastrophe.
3
Synthesize the findings to establish the most likely diagnosis.
The combination of an embolic source and 'pain out of proportion to physical examination findings' strongly suggests acute mesenteric ischemia.
Matching the classic physical examination pattern to the patient's thromboembolic risk confirms the diagnosis.

Key Concept

The classic physical examination presentation of acute mesenteric ischemia is severe abdominal pain that is out of proportion to the relatively benign objective findings on abdominal palpation.
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Physical Examination Findings

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