Diagnosis and Management of Large Vessel Vasculitis

Clinical Assessment and Diagnosis

The American College of Rheumatology recommends initiating high-dose glucocorticoids (40-60 mg/day prednisone) immediately upon clinical suspicion of large vessel vasculitis, before imaging confirmation, to prevent irreversible complications 1, 2, 3
For Giant Cell Arteritis (GCA), key clinical features include new-onset temporal headache, scalp tenderness, jaw claudication, visual symptoms, tenderness or thickening of temporal arteries, and constitutional symptoms, particularly in patients aged 50 years or older 1, 2, 3
For Takayasu Arteritis, key clinical features include hypertension, new loss of pulses, pulse inequality, vascular bruits, and blood pressure discrepancy, particularly in patients under 40 years old 1, 2, 4

The European League Against Rheumatism recommends obtaining inflammatory markers, such as erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP), immediately, recognizing their limitations, and using them in conjunction with clinical assessment and imaging to confirm diagnosis 1, 2, 5
For suspected GCA, first-line imaging includes ultrasound of temporal arteries, showing a non-compressible "halo" sign, or high-resolution MRI of cranial arteries to detect mural inflammation 1, 5, 6
For suspected Takayasu Arteritis, first-line imaging includes MRI/MRA to investigate mural inflammation and luminal changes, with alternative modalities including PET-CT, CT/CTA, or ultrasound for extracranial vessels 1, 2, 4, 6

The American College of Rheumatology recommends initiating high-dose oral prednisone (40-60 mg/day) immediately upon clinical suspicion of GCA or Takayasu Arteritis, with consideration of intravenous methylprednisolone for acute vision loss or amaurosis fugax in GCA 1, 2, 3, 7
For Takayasu Arteritis, initiate high-dose oral glucocorticoids plus a non-glucocorticoid immunosuppressive agent, such as methotrexate, simultaneously 1, 2, 4, 8

Establish baseline assessment with four-extremity blood pressures, complete vascular examination, and cross-sectional imaging, and schedule regular follow-up imaging every 3-6 months during active disease 4, 6
At each clinical visit, assess four-extremity blood pressures, perform vascular examination, and evaluate for clinical signs/symptoms of active disease, using inflammatory markers as imperfect indicators 4