Examkin

Question

Difficulty: HardPhysical Examination Findings

An ambulatory care clinic receives a 71-year-old man for the assessment of a non-healing sore on his right foot, present for four weeks. His medical history is significant for a 40 pack-year smoking habit and type 2 diabetes mellitus. He reports intense, burning pain in the right foot that frequently awakens him from sleep; he manages this by sitting on the edge of the bed and letting his legs dangle. During the evaluation, the resident notes the patient's long-standing diabetes and suggests, "This is likely a neuropathic complication. We should proceed with an MRI of the foot to investigate for potential osteomyelitis."

The attending physician intervenes, directing attention to the specific physical characteristics of the lesion: it is situated at the distal tip of the right second toe, features a dry and pale wound base with no purulence, and is surrounded by cool, hairless skin. The attending states that non-invasive arterial studies are the immediate priority.

Based on the attending physician's clinical assessment, which of the following physical examination findings is most specific to the underlying etiology of this patient's ulcer?

  1. Marked blanching of the plantar surface when the leg is elevated to 60∘60^\circAnswer
  2. B
    A thick, hyperkeratotic rim of callus directly surrounding the wound margins
  3. C
    Bounding pedal pulses accompanied by a brisk capillary refill time of <2< 2 seconds
  4. D
    Extensive brownish hemosiderin pigmentation concentrated at the medial malleolus
  5. E
    Complete loss of protective sensation tested by a 1010-gram monofilament

Answer

Marked blanching of the plantar surface when the leg is elevated to 60∘60^\circ, indicating a positive Buerger's test for peripheral arterial disease.
The correct answer identifies marked blanching of the plantar surface upon leg elevation. This describes a positive Buerger's test, which indicates severe peripheral arterial disease (PAD). The patient's history of ischemic rest pain (pain at night relieved by dependency) and the specific ulcer morphology (apical toe location, pale base, dry, cool and hairless surrounding skin) confirm an arterial etiology. Recognizing this prevents the unnecessary MRI suggested by the resident and correctly prompts non-invasive vascular testing.

Step-by-Step Solution

1
Analyze the patient's symptoms and pain pattern.
The patient has severe pain at rest that is relieved by leg dependency, which is classic for ischemic rest pain seen in advanced peripheral arterial disease (PAD).
Differentiating the type of pain helps narrow the etiology of the foot ulcer before relying solely on the patient's medical history.
2
Correlate the pain pattern with the physical examination findings of the ulcer.
The ulcer is located on the tip of the toe, is pale and dry, and is surrounded by cool, hairless skin.
These are textbook physical signs of an arterial ulcer, contrasting sharply with neuropathic (plantar pressure points, warm, callus) or venous (medial malleolus, exudative, hemosiderin) ulcers.
3
Identify the physical examination maneuver that confirms the suspected arterial diagnosis.
A positive Buerger's test (pallor on elevation, reactive rubor on dependency) specifically demonstrates arterial insufficiency.
Confirming the arterial etiology via physical examination correctly directs the next step in management (ankle-brachial index) rather than an unnecessary MRI for suspected neuropathic osteomyelitis.

Key Concept

Differentiating foot ulcers based on physical examination findings (arterial vs. neuropathic vs. venous) is critical for determining appropriate diagnostic sequencing.
Estimated Time:1m 15s
Rate this question

Topics

Physical Examination Findings

More questions from this topic