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Difficulty: MediumPhysical Examination Findings

An ambulatory clinic evaluates a retired mail carrier reporting a three-month history of tightness and aching in the right calf. The discomfort reliably begins after walking approximately two blocks and fully resolves after five minutes of standing idle. Comorbidities include diet-controlled type 2 diabetes mellitus, hyperlipidemia, and long-standing tobacco use. Bilateral lower extremity pulses are palpable but faintly diminished on the right. Which of the following physical examination findings would most specifically confirm the suspected etiology of this patient's symptoms?

  1. A
    Sharp exacerbation of the calf discomfort when the examiner abruptly and passively dorsiflexes the affected ankle
  2. B
    Reproduction of the cramping pain when the patient actively extends the lumbar spine while standing
  3. C
    Pronounced indentation of the pretibial skin that persists after applying firm pressure for several seconds
  4. Development of striking foot pallor upon limb elevation followed by intense erythema when placed in a dependent positionAnswer
  5. E
    A prominent, palpable, and expansile pulsation located deep within the popliteal fossa

Answer

Development of striking foot pallor upon limb elevation followed by intense erythema when placed in a dependent position
The patient's presentation of reproducible, exercise-induced calf pain relieved by standing is highly characteristic of intermittent claudication due to peripheral arterial disease (PAD). The physical examination finding of elevation pallor and dependent rubor (Buerger's test) strongly supports this diagnosis. It indicates severe arterial insufficiency where the arterioles maximally dilate due to chronic tissue ischemia, subsequently causing a striking red or purplish discoloration (rubor) when gravity assists blood flow back into the dependent foot.

Step-by-Step Solution

1
Analyze the patient's clinical presentation and medical history.
A patient with multiple vascular risk factors (diabetes, hyperlipidemia, smoking) presents with reproducible exertional calf pain that is relieved by rest.
Identifying the classic triad of intermittent claudication (exertional onset, reproducible distance, relief with standing) helps establish peripheral arterial disease (PAD) as the leading diagnosis.
2
Correlate the suspected diagnosis with specific physical examination maneuvers.
PAD is characterized by signs of poor arterial perfusion, such as diminished pulses, hair loss, and gravity-dependent skin color changes.
Physical examination acts as a critical bedside diagnostic tool to differentiate arterial, venous, and neurologic causes of lower extremity pain.
3
Evaluate the options to identify the finding that specifically indicates arterial insufficiency.
Elevation pallor followed by dependent rubor (Buerger's test) is the classic specific physical exam sign of PAD.
In PAD, arterioles maximally dilate due to chronic ischemia, causing striking redness (rubor) when gravity assists blood flow into the dependent foot.

Key Concept

Physical Examination Findings of Peripheral Arterial Disease
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Topics

Physical Examination Findings

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