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Giant cell arteritis (GCA) and polymyalgia rheumatica (PMR) are inflammatory conditions more prevalent in older adults of Northern European descent. Prompt glucocorticoid treatment is crucial for GCA to prevent vision loss and stroke.

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Area of Science:

  • Rheumatology
  • Internal Medicine
  • Vascular Inflammation

Background:

  • Giant cell arteritis (GCA) and polymyalgia rheumatica (PMR) disproportionately affect individuals of North European ancestry, with women being 2-3 times more susceptible.
  • Both conditions are rare before age 50, with PMR potentially occurring independently or alongside GCA.
  • Elevated inflammatory cytokines in temporal arteries of PMR patients, even without overt arteritis, suggest subclinical GCA in one-third of cases detected by PET scans.

Approach:

  • Diagnosis of GCA involves clinical symptoms (headache, jaw claudication, vision loss), elevated inflammatory markers (ESR, CRP), and potentially temporal artery biopsy or ultrasound.
  • PMR diagnosis is primarily clinical, characterized by bilateral shoulder aching and morning stiffness.
  • Exclusion of mimic conditions is essential for accurate GCA and PMR diagnosis.

Key Points:

  • Common GCA symptoms include headache, temporal artery tenderness, jaw claudication, PMR, vision loss, and fever.
  • PMR typically presents with bilateral shoulder aching and morning stiffness.
  • Both conditions show elevated ESR and CRP; anemia and thrombocytosis can also occur.

Conclusions:

  • Glucocorticoids are the primary treatment for GCA and PMR, with prompt GCA treatment vital to prevent vision loss and stroke.
  • Low-dose aspirin may offer additional protection against GCA complications.
  • While treatment averages 2-3 years, some patients require longer courses, facing potential disease or treatment-related complications; steroid-sparing agents are under investigation.