Role of Carotid Ultrasound in Diagnosing Giant Cell Arteritis
Diagnostic Recommendations for GCA
- The American College of Rheumatology conditionally recommends temporal artery biopsy over temporal artery ultrasound for establishing a diagnosis of GCA, with a preference for long-segment temporal artery biopsy (>1 cm) to improve diagnostic yield 1, 3, 4, 5
- Biopsy should be obtained within 2 weeks of starting glucocorticoids to maximize detection of histopathologic changes, as recommended by the American College of Rheumatology 3, 6
Role of Ultrasound in GCA Diagnosis
- Ultrasound is operator-dependent and results are influenced by treatment, with signs of inflammation quickly disappearing after glucocorticoid initiation, according to the American College of Rheumatology 1, 2
- In centers with appropriate training and expertise, temporal artery ultrasound may be a useful complementary tool for diagnosing GCA, as suggested by the American College of Rheumatology 1, 3
Vascular Imaging Recommendations
- For patients with suspected GCA and a negative temporal artery biopsy, noninvasive vascular imaging of large vessels with clinical assessment is conditionally recommended to aid in diagnosis, as recommended by the American College of Rheumatology 1, 7
- For patients with newly diagnosed GCA, noninvasive vascular imaging is conditionally recommended to evaluate large vessel involvement, according to the American College of Rheumatology 1, 2