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Difficulty: MediumRheumatology and Immunology

A 72-year-old woman presents to the emergency department with a 3-week history of severe aching and morning stiffness in her shoulders and hips that lasts for several hours. Over the past 3 days, she has developed a throbbing, new-onset right-sided headache and reports that her jaw aches and tires easily when she chews solid foods. Her temperature is 37.9°C (100.2°F), blood pressure is 138/85 mmHg, and heart rate is 88/min. Physical examination reveals scalp tenderness on the right side and prominent, rope-like temporal arteries. Neurologic examination is unremarkable, and visual acuity is currently intact. Laboratory studies show an erythrocyte sedimentation rate of 98 mm/h and a C-reactive protein of 45 mg/L. Which of the following is the most appropriate next step in the management of this patient?

  1. Initiate high-dose systemic glucocorticoids immediatelyAnswer
  2. B
    Perform a temporal artery biopsy before starting pharmacotherapy
  3. C
    Prescribe high-dose naproxen and schedule a rheumatology follow-up
  4. D
    Order an urgent magnetic resonance imaging of the head
  5. E
    Obtain blood cultures and initiate empiric broad-spectrum intravenous antibiotics

Answer

Initiate high-dose systemic glucocorticoids immediately
The clinical presentation of a new-onset throbbing headache, jaw claudication, scalp tenderness, and a markedly elevated erythrocyte sedimentation rate in a patient over 50 years old is highly suggestive of giant cell arteritis (GCA). The most feared complication of GCA is permanent vision loss due to anterior ischemic optic neuropathy. Because vision loss can occur suddenly and is irreversible, high-dose systemic glucocorticoids (such as prednisone) must be administered immediately upon clinical suspicion. A temporal artery biopsy remains the gold standard for definitive diagnosis, but sight-saving treatment should never be delayed while waiting for the biopsy to be performed.

Step-by-Step Solution

1
Identify the clinical syndrome from the patient's history and physical examination.
The patient has symptoms of polymyalgia rheumatica (shoulder and hip aching/stiffness) combined with features of giant cell arteritis (new headache, jaw claudication, scalp tenderness, prominent temporal arteries).
Recognizing this classic constellation of symptoms in a patient over 50 years old establishes a very high pre-test probability of giant cell arteritis (GCA).
2
Determine the primary clinical risk associated with this condition.
The most severe, feared complication of GCA is anterior ischemic optic neuropathy, which leads to sudden and irreversible vision loss.
Understanding the timeline and severity of complications dictates the urgency of therapeutic intervention.
3
Select the appropriate sequence for diagnostic testing versus pharmacotherapy.
High-dose systemic glucocorticoids must be started immediately. A temporal artery biopsy should be scheduled but must follow the initiation of steroids.
Steroids quickly reduce vascular inflammation and prevent vision loss, while diagnostic histopathologic changes on biopsy remain visible for 2 to 4 weeks after therapy begins.

Key Concept

Giant cell arteritis requires immediate empiric treatment with high-dose glucocorticoids to prevent irreversible vision loss; treatment must not be delayed to obtain a temporal artery biopsy.
Estimated Time:1m 15s
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Topics

Rheumatology and Immunology

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