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Retinal venous sheathing in optic neuritis. Its significance for the pathogenesis of multiple sclerosis
Abstract:
A systematic study of the frequency of retinal vascular abnormalities and cells in the media has been made in 50 patients presenting with acute optic neuritis. Abnormalities were found in 14 (fluorescein leakage in 10, perivenous sheathing in 6, cells in the vitreous in 6 and in the anterior chamber in 4; in 2 the cells in the media were seen without vascular changes). After a mean follow up of 3.5 years multiple sclerosis (MS) had developed in 8/14 patients with vascular abnormalities and/or evidence of inflammation and in 5/32 without; the difference is significant (P less than 0.02). The occurrence of perivenular abnormalities in a region free of myelin and oligodendrocytes provides evidence that the vascular changes in MS can occur independently of contiguous demyelination, and may be the primary event in the formation of a new lesion.
Insights
Retinal vascular abnormalities in acute optic neuritis patients predict multiple sclerosis (MS) development. These vascular changes may initiate MS lesions independently of demyelination.
Area of Science:
- Ophthalmology
- Neurology
- Immunology
Background:
- Acute optic neuritis is a common presenting symptom of multiple sclerosis (MS).
- The exact pathological mechanisms initiating MS lesions remain under investigation.
- Retinal examination offers a potential window into central nervous system inflammatory processes.
Purpose of the Study:
- To investigate the frequency of retinal vascular abnormalities and inflammatory cells in patients with acute optic neuritis.
- To determine if these findings correlate with the subsequent development of multiple sclerosis.
- To explore the potential role of vascular changes in MS lesion formation.
Main Methods:
- Systematic examination of 50 patients with acute optic neuritis.
- Assessment for retinal vascular abnormalities including fluorescein leakage and perivenous sheathing.
- Evaluation for inflammatory cells in ocular media (vitreous and anterior chamber).
- Long-term follow-up to ascertain the development of multiple sclerosis.
Main Results:
- Retinal vascular abnormalities or inflammatory cells were observed in 14 out of 50 patients.
- Subsequent development of multiple sclerosis occurred in 8/14 patients with these ocular findings versus 5/32 without (P < 0.02).
- Perivenular abnormalities were noted in areas lacking myelin and oligodendrocytes.
Conclusions:
- Retinal vascular abnormalities in acute optic neuritis are significantly associated with an increased risk of developing multiple sclerosis.
- These vascular changes may represent an early, independent event in MS pathogenesis, potentially preceding demyelination.
- Ocular findings could serve as a biomarker for MS risk stratification and understanding disease mechanisms.