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Early lacunar strokes complicating polyarteritis nodosa: thrombotic microangiopathy
M D Reichart1, J Bogousslavsky, R C Janzer
1Department of Neurology, University Hospital of Lausanne, Switzerland.
Neurology
|February 26, 2000
Summary
Polyarteritis nodosa (PAN)-associated strokes (PANAS) often manifest as early lacunar strokes, not typically linked to vasculitis. Corticosteroid (CS) therapy may exacerbate this risk, suggesting antiplatelet agents could be beneficial.
Area of Science:
- Neurology
- Rheumatology
- Vascular Medicine
Background:
- Strokes are considered rare, late-stage complications of polyarteritis nodosa (PAN).
- The exact cause of stroke in PAN remains unclear, with theories including atherosclerosis-like changes or vasculitic occlusion.
Observation:
- This study analyzed 15 cases of PAN-associated strokes (PANAS), examining clinical and radiologic patterns, latency, and treatment.
- A significantly shorter latency for stroke onset was observed, with most cases occurring within 8 months of PAN diagnosis.
Findings:
- Lacunar stroke syndrome was the predominant pattern (73%), characterized by small, deep infarcts, particularly in the pons.
- A strong association was found between corticosteroid (CS) use and stroke occurrence, with many strokes developing shortly after CS initiation or dose escalation.
- The underlying mechanism appears to be thrombotic microangiopathy affecting small penetrating arteries, rather than active vasculitis.
Implications:
- Early recognition of lacunar stroke as a primary PANAS manifestation is crucial.
- Corticosteroid therapy might contribute to stroke risk through mechanisms like enhanced platelet activity or arterial fibrosis.
- Combination therapy with antiplatelet agents and corticosteroids may be a strategy to prevent stroke in PAN patients.