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Persistent microvasculopathy in chronic eosinophilia-myalgia syndrome
1University of Minnesota, Hennepin Faculty Associates Neuromuscular Center, Minneapolis 55404, USA.
Advances in Experimental Medicine and Biology
|January 1, 1996
Summary
Chronic eosinophilia-myalgia syndrome (EMS) involves persistent microvascular disease, unlike the acute phase. Biopsies reveal ongoing endothelial pathology and dysfunction years after L-tryptophan exposure.
Area of Science:
- Pathology
- Immunology
- Neurology
Background:
- Eosinophilia-myalgia syndrome (EMS) is a serious condition linked to contaminated L-tryptophan (LT) exposure.
- Some individuals experience long-term symptoms including myalgia, fatigue, and cognitive issues, indicating a chronic form of the disease.
Purpose of the Study:
- To investigate the pathological characteristics of chronic EMS.
- To understand the long-term effects of LT exposure on affected tissues.
Main Methods:
- Skin, fascia, and muscle biopsies were performed on 17 patients with chronic EMS symptoms.
- Biopsies were analyzed four to five years after initial LT exposure and EMS onset.
Main Results:
- All patients exhibited microvascular disease.
- Lymphocytic inflammatory infiltrates were common, with some cases showing dermal sclerosis.
- Eosinophil infiltration was rare in the chronic state, contrasting with acute EMS.
Conclusions:
- Persistent microvascular disease is a hallmark of chronic EMS.
- Endothelial pathology indicates ongoing microvascular dysfunction in long-term EMS.
- Pathological findings in chronic EMS differ from acute EMS, particularly regarding eosinophil presence.
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