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Optic disc edema in raised intracranial pressure. V. Pathogenesis
Archives of Ophthalmology (Chicago, Ill. : 1960)
|September 1, 1977
Summary
Optic disc edema (ODE) results from mechanical pressure on the optic nerve sheath. Raised cerebrospinal fluid pressure causes axoplasmic flow stasis, leading to axonal swelling and edema.
Area of Science:
- Ophthalmology
- Neurology
- Pathophysiology
Background:
- Optic disc edema (ODE) is a clinical sign associated with increased intracranial pressure.
- The exact mechanisms leading to ODE have been debated.
- Recent observations offer new insights into its pathogenesis.
Purpose of the Study:
- To discuss the pathogenesis of optic disc edema (ODE) in the context of raised intracranial pressure.
- To elucidate the mechanical factors involved in ODE development.
- To differentiate the mechanisms of ODE in conditions with and without elevated cerebrospinal fluid pressure.
Main Methods:
- Review of recent observations and literature on optic disc edema.
- Analysis of the mechanical effects of cerebrospinal fluid pressure on optic nerve axoplasmic flow.
- Comparison of ODE pathogenesis in various clinical scenarios.
Main Results:
- Optic disc edema (ODE) is primarily a mechanical phenomenon.
- Elevated cerebrospinal fluid pressure (CSFP) within the optic nerve sheath causes axoplasmic flow stasis.
- This stasis leads to axonal swelling, manifesting as early ODE and subsequent vascular changes.
Conclusions:
- Raised CSFP is a key driver of ODE through induced axoplasmic flow stasis.
- While axoplasmic flow stasis occurs in ODE without raised CSFP, the underlying mechanisms vary.
- A single unifying mechanism for all ODE cases is not supported by current findings.