Giant Cell Arteritis Diagnosis and Management

Clinical Presentation and Red Flags

Bilateral temporal pallor suggests optic nerve ischemia, even with current normal vision, and mandates urgent workup, according to the American Academy of Ophthalmology 1
Temporal region pain with headache is classic for GCA, which can cause permanent visual loss if untreated, as stated by the American College of Rheumatology 1, 2, 3
Neck pain with headache in this context raises concern for vascular inflammation, as noted by the American Heart Association 1

ESR and CRP should be performed immediately, even if only slightly elevated, as the American College of Physicians recommends, to assess for possible GCA in elderly patients with these symptoms 1, 2
Blood pressure, serum glucose, and hemoglobin A1c should be assessed to evaluate vasculopathic risk factors, as suggested by the American Diabetes Association 1, 4
Temporal artery biopsy is definitive for diagnosis and should be performed if ESR/CRP suggest possible GCA, according to the American Academy of Ophthalmology 1

MRI brain and orbits with contrast should be ordered if GCA is excluded but symptoms persist, to evaluate for other causes of bilateral optic nerve pallor, as recommended by the American Academy of Neurology 1, 5
Lumbar puncture is indicated for evidence of increased intracranial pressure with papilledema or meningeal signs, as stated by the American Academy of Neurology 1

Fundus examination should be performed to check for papilledema or optic atrophy, as recommended by the American Academy of Ophthalmology 6
Visual field testing may reveal defects despite normal acuity, according to the American Academy of Ophthalmology 6
Pupillary examination should assess for afferent pupillary defect, as suggested by the American Academy of Ophthalmology 5
Cranial nerve assessment should look for associated palsies, nystagmus, or Horner's syndrome, as recommended by the American Academy of Neurology 6

High-dose corticosteroids must be initiated promptly to prevent permanent visual loss if GCA is confirmed or highly suspected, as stated by the American College of Rheumatology 1, 5
Treatment of underlying vasculopathic risk factors, such as diabetes and hypertension, is essential if GCA is excluded, as recommended by the American Heart Association 1, 4, 7