If you’re preparing for the United States Medical Licensing Examination® (USMLE®) Step 2 exam, you might want to know which questions are most often missed by test-prep takers. Check out this example from Kaplan Medical, and read an expert explanation of the answer. Also check out all posts in this series.
An 82-year-old woman comes to the physician because of a right-sided throbbing headache, which has occurred intermittently for two weeks. She has also had fatigue and intermittent jaw pain when chewing. The patient has a 25-year history of hypertension treated with hydrochlorothiazide. She is in no distress. Her temperature is 98.8 ºF (37.1 ºC), blood pressure 125/83 mm Hg, pulse is 92 beats per minute, and respirations 20 per minute. Examination is remarkable for a weak, tender, but palpable right-sided temporal artery pulse, as well as tenderness to palpation on the right side of the face.
Which of the following is the most appropriate next step in management?
A. Erythrocyte sedimentation rate test.
B. High-dose prednisone with slow taper.
C. Magnetic resonance angiography (MRA) of carotid circulation.
D. Nonsteroidal anti-inflammatory medications (NSAIDs).
E. Urgent referral for biopsy of vessel and base treatment on results.
The correct answer is A.
This patient has signs and symptoms of temporal arteritis, also known as giant cell arteritis. It is a progressive inflammatory disorder that affects large cranial arteries. Common symptoms include unilateral headache, jaw claudication (pain with chewing), and amaurosis fugax (transient ischemic attack of the retina).
Temporal arteritis is more common in individuals who have polymyalgia rheumatica. The initial workup of temporal arteritis should include an erythrocyte sedimentation rate (ESR); an elevated ESR (greater than 100 mm/hour) in the presence of clinical symptoms is virtually diagnostic of temporal arteritis. Laboratory studies may also reveal elevated C-reactive protein or anemia of chronic disease. Approximately 15 to 20 percent of patients who have untreated temporal arteritis develop blindness from involvement of the ophthalmic artery or its branches.
Choice B: In the presence of an elevated ESR and acute symptoms, including visual changes, immediate high-dose prednisone or IV methylprednisolone should be initiated. It is essential to begin treatment with glucocorticoids immediately to prevent this complication.
Choice C: MRA is useful for studying carotid circulation, but is not necessary to diagnose or to treat this condition. Waiting for an MRA is an unnecessary and dangerous delay.
Choice D: NSAIDs are an adjunct treatment used to facilitate tapering of steroids and help control pain. They do not provide adequate anti-inflammatory effects to be considered first-line therapy.
Choice E: Temporal artery biopsy is the gold standard for diagnosis, but it may be deferred in those who have acute, threatening symptoms. If there is no improvement in symptoms in 72 hours, the diagnosis should be revisited. Patients who respond to glucocorticoids will need to be tapered and kept on low-dose maintenance therapy for at least one year, with monitoring of the ESR to gauge response.
- Temporal arteritis (GCA): headache, visual disturbances, PMR, jaw claudication.
- High ESR plus symptoms equals immediate treatment with IV methylprednisone.
- Temporal artery biopsy is the gold standard for diagnosis.
For more prep questions on USMLE Steps 1, 2 and 3, view other posts in this series.
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