The fine line between Takayasu arteritis and giant cell arteritis

Area of Science:

• Rheumatology
• Vascular Medicine
• Internal Medicine

Background:

• Large vessel arteritis (LVA) encompasses conditions like Takayasu arteritis (TAK) and giant cell arteritis (GCA).
• Distinguishing between TAK and GCA, particularly in patients over 50, can be challenging.
• Previous assumptions may underestimate the prevalence of TAK-typical vascular involvement in older LVA patients.

Purpose of the Study:

• To describe clinical characteristics and vascular involvement in patients over 50 with LVA.
• To investigate the overlap and potential spectrum between TAK and GCA in this age group.
• To evaluate treatment outcomes and compare disease manifestations based on diagnostic criteria.

Main Methods:

• Retrospective review of 18 patients aged over 50 with LVA.
• Analysis of clinical data, laboratory values, and vascular imaging (CT, MRI, angiography).
• Assessment of adherence to American College of Rheumatology (ACR) criteria for GCA and TAK.

Main Results:

• Median patient age was 64 years; 61% had signs of vascular compromise.
• Common symptoms were constitutional; cranial/peripheral symptoms were rare.
• Significant arterial involvement observed, including aorta (78%), carotids (9), and subclavian arteries (12).
• Six of nine temporal artery biopsies confirmed giant cell arteritis.
• Sixty percent of patients achieved remission after one year of treatment with prednisone and steroid-sparing agents.
• No significant differences in vascular involvement or outcomes were found between GCA and TAK groups.

Conclusions:

• Vascular involvement typical of TAK is more common in patients over 50 with LVA than previously thought.
• TAK and GCA may represent a continuum of the same underlying disease process.
• Findings support a unified view of these conditions, impacting diagnostic and therapeutic approaches.