During a routine primary care appointment, a 71-year-old woman reports experiencing a seve… — USMLE Step 2 CK

During a routine primary care appointment, a $71$ -year-old woman reports experiencing a severe, right-sided headache for the past two weeks. She describes her scalp as being highly sensitive, noting that it hurts simply to brush her hair. Over the last $48$ hours, she has also developed a deep, cramping pain in her jaw that exclusively occurs when she is eating meals. Earlier this morning, she experienced a frightening episode where the vision in her right eye completely went dark for five minutes before spontaneously returning to normal. Her temperature is $37.7^\circ\text{C}$ ( $99.9^\circ\text{F}$ ). Physical examination demonstrates a prominent, thickened right temporal artery that is tender to palpation and lacks a palpable pulse. Point-of-care laboratory testing reveals an erythrocyte sedimentation rate of $105\text{ mm/h}$ .

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

A
Perform a non-contrast CT scan of the head
B
Perform a temporal artery biopsy prior to initiating medical therapy
Immediate administration of high-dose corticosteroidsCevap
D
Administration of broad-spectrum intravenous antibiotics
E
Prescription of oral indomethacin and outpatient neurology referral

Cevap

The most appropriate next step is the immediate administration of high-dose corticosteroids to prevent irreversible vision loss caused by giant cell arteritis.

Giant cell arteritis is a large-vessel vasculitis that most commonly affects branches of the carotid artery in older adults. When inflammation involves the ophthalmic artery, it can cause transient vision loss (amaurosis fugax) which rapidly progresses to permanent blindness if left untreated. The immediate priority is administering high-dose systemic corticosteroids (e.g., intravenous methylprednisolone or high-dose oral prednisone depending on severity) to abruptly halt the inflammatory cascade. While a temporal artery biopsy remains the gold standard for a definitive diagnosis, empirical therapy must be initiated the moment clinical suspicion is established, long before the biopsy is scheduled.

Adım Adım Çözüm

Analyze the patient's demographic and clinical presentation.

The patient is an elderly woman presenting with a new-onset headache, scalp tenderness, jaw claudication, and a transient episode of monocular vision loss (amaurosis fugax).

Identifying the classic triad of symptoms (headache, jaw claudication, vision changes) in a patient over 50 is essential for recognizing the underlying syndrome.

Correlate physical examination and laboratory findings with the clinical syndrome.

The thickened, tender temporal artery without a pulse and a markedly elevated erythrocyte sedimentation rate (

105\text{ mm/h}

) strongly confirm a state of systemic inflammation localized to the cranial arteries.

These findings solidify the clinical diagnosis of giant cell arteritis (temporal arteritis).

Determine the urgency and select the most appropriate initial intervention.

Because the patient has already experienced transient vision loss, she is at imminent risk for irreversible blindness (anterior ischemic optic neuropathy). Therefore, high-dose corticosteroids must be administered immediately.

In giant cell arteritis with ischemic complications, reducing vascular inflammation immediately takes precedence over any diagnostic testing to preserve organ function.

Anahtar Kavram

Patients with suspected giant cell arteritis (temporal arteritis), especially those with visual symptoms or jaw claudication, require immediate administration of high-dose systemic corticosteroids to prevent irreversible blindness. Treatment should never be delayed for a temporal artery biopsy.

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