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Difficulty: MediumRheumatology and Immunology

A 7474-year-old woman is brought to the emergency department by her daughter due to a recent episode of vision loss in her right eye. The patient states that while eating breakfast this morning, a "dark curtain" descended over her right eye, causing complete blindness in that eye for approximately 1515 minutes before fully resolving. Over the past 33 weeks, she has experienced a persistent right-sided headache, generalized fatigue, and pain in her jaw muscles that worsens when she chews. Her medical history is significant for hypertension and polymyalgia rheumatica. Her temperature is 37.8∘C37.8^\circ\text{C} (100.0∘F100.0^\circ\text{F}), blood pressure is 135/85 mmHg135/85\text{ mmHg}, and pulse is 88/min88/\text{min}. Physical examination shows a prominent, nodular, and tender right temporal artery with diminished pulsation. Visual acuity is currently 20/2020/20 in both eyes. Laboratory studies show:

Hemoglobin: 11.2 g/dL11.2\text{ g/dL}
Leukocyte count: 9,500/mm39,500/\text{mm}^3
Erythrocyte sedimentation rate: 95 mm/h95\text{ mm/h}
C-reactive protein: 45 mg/L45\text{ mg/L}

Which of the following is the most appropriate next step in management?

  1. A
    Obtain a non-contrast computed tomography of the head
  2. B
    Initiate high-dose oral prednisone
  3. Administer intravenous methylprednisoloneAnswer
  4. D
    Perform a temporal artery biopsy
  5. E
    Administer intravenous ceftriaxone and vancomycin

Answer

Administer intravenous methylprednisolone
This patient's presentation is classic for giant cell arteritis (GCA), characterized by a new-onset headache, jaw claudication, an abnormal temporal artery on palpation, and a markedly elevated erythrocyte sedimentation rate (ESR). Her history of polymyalgia rheumatica further increases the pretest probability of GCA. The critical feature in this vignette is the episode of transient monocular vision loss (amaurosis fugax). In GCA, visual symptoms indicate active retinal ischemia due to arteritic anterior ischemic optic neuropathy. To prevent permanent, irreversible blindness, patients with suspected GCA and visual symptoms must receive immediate pulse intravenous methylprednisolone (typically 500500 to 1000 mg1000\text{ mg} daily for 33 days). Once therapy is initiated, a temporal artery biopsy should be scheduled to confirm the diagnosis, as biopsy results remain reliable for 11 to 22 weeks after starting glucocorticoids.

Step-by-Step Solution

1
Identify the primary clinical syndrome.
The patient has a new-onset headache, jaw claudication, temporal artery tenderness, and a highly elevated erythrocyte sedimentation rate in the setting of polymyalgia rheumatica, which is highly suggestive of giant cell arteritis (GCA).
Recognizing the classic triad of symptoms and laboratory findings establishes the working diagnosis.
2
Assess for severe or organ-threatening complications.
The patient experienced a transient loss of vision (amaurosis fugax) in the right eye.
Amaurosis fugax in the setting of GCA indicates active retinal ischemia and represents an impending permanent vision loss, which significantly alters the standard treatment pathway.
3
Determine the most appropriate initial management based on the presence of complications.
Intravenous pulse methylprednisolone must be administered immediately.
While uncomplicated GCA is treated with oral prednisone, the presence of ischemic visual symptoms mandates aggressive intravenous glucocorticoid therapy to prevent irreversible blindness. A temporal artery biopsy should be planned but must not delay treatment.

Key Concept

Management of giant cell arteritis (GCA) with visual symptoms
Estimated Time:1m 30s
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Topics

Rheumatology and Immunology

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