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Renal vascular histology and morphometry in systemic sclerosis. A case-control autopsy study
D C Trostle1, C D Bedetti, V D Steen
1Department of Medicine, University of Pittsburgh School of Medicine, Pennsylvania.
Arthritis and Rheumatism
|March 1, 1988
Summary
Systemic sclerosis causes significant renal vascular changes, including intimal thickening, particularly in diffuse disease. These changes differ between diffuse scleroderma and CREST syndrome, indicating distinct arterial disease patterns.
Area of Science:
- Nephrology
- Rheumatology
- Pathology
Background:
- Systemic sclerosis (scleroderma) is a multisystem autoimmune disease characterized by fibrosis and vascular abnormalities.
- Renal involvement, or scleroderma renal crisis, is a serious complication, particularly in patients with diffuse cutaneous disease.
- Understanding the specific renal vascular pathology is crucial for managing systemic sclerosis.
Purpose of the Study:
- To investigate the histological and morphometric changes in renal vasculature in patients with systemic sclerosis.
- To compare vascular changes between diffuse cutaneous systemic sclerosis and limited cutaneous disease (CREST syndrome).
- To identify differences in renal vascular pathology associated with scleroderma renal crisis.
Main Methods:
- An autopsy case-control study was conducted using renal tissue from 35 systemic sclerosis patients and age/sex-matched controls.
- Histology and morphometry of small and medium-sized renal arteries were performed using a Zeiss Image Analyzer.
- Analysis of variance was used to compare intimal and medial areas, and the proportion of the vessel wall occupied by intima.
Main Results:
- Significant intimal thickening (increased intimal area) was observed in small and medium arteries in diffuse scleroderma and small arteries in CREST syndrome patients compared to controls.
- A decreased medial area was consistently found across all patient groups.
- Patients with diffuse disease and renal crisis exhibited the greatest luminal occlusion and severe intimal thickening with fibrinoid necrosis.
Conclusions:
- Renal vascular structural changes, including intimal thickening, are integral to systemic sclerosis.
- Distinct differences in intimal thickening and luminal occlusion exist between diffuse scleroderma and CREST syndrome, suggesting unique arterial disease processes.
- These findings highlight the specific vascular pathology in different subsets of systemic sclerosis.