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The excessive pressure damages the endothelial layer and the blood–brain barrier, leading to swelling (edema). The predilection toward the posterior brain may be explained by the reduced density of sympathetic innervation in the posterior circulation compared to the anterior circulation (thus a reduced adaptive capacity to fluctuations or ...
Ocular ischemic syndrome is the constellation of ocular signs and symptoms secondary to severe, chronic arterial hypoperfusion to the eye. [1] Amaurosis fugax is a form of acute vision loss caused by reduced blood flow to the eye; it may be a warning sign of an impending stroke, as both stroke and retinal artery occlusion can be caused by thromboembolism due to atherosclerosis elsewhere in the ...
For example, when cytotoxic edema occurs in the endothelial cells of the blood–brain barrier, oncotic cell death contributes to loss of integrity of the blood–brain barrier and promotes the progression to vasogenic edema. [8] When brain edema types are combined, there is typically a primary form and the edema type and context of the cause ...
Major symptoms are sudden loss of vision (partial or complete), sudden blurred or "foggy" vision, and; pain on movement of the affected eye. [4] [5] [2]Many patients with optic neuritis may lose some of their color vision in the affected eye (especially red), with colors appearing subtly washed out compared to the other eye.
In many cases, only one eye is affected and the person may not be aware of the loss of color vision until the examiner asks them to cover the healthy eye. People may also engage in "eccentric viewing" using peripheral vision to compensate for central vision loss characteristic in genetic, toxic, or nutritional optic neuropathy.
The optic disc is where the axons from the retinal ganglion cells collect into the optic nerve. The optic nerve is the bundle of axons that carry the visual signals from the eye to the brain. This optic nerve must penetrate through the wall of the eye, and the hole to accommodate this is usually 20-30% larger than the nerve diameter.
ROSAH stands for retinal dystrophy, optic nerve edema, splenomegaly, anhidrosis and headache. The name emphasizes some, but not all, of the features that can be associated with the syndrome. [ 2 ] The disease is inherited in an autosomal dominant manner and caused by heterozygous missense mutations in the ALPK1 gene , an innate immune sensor ...
Reye syndrome is a rapidly worsening brain disease. [2] Symptoms of Reye syndrome may include vomiting , personality changes, confusion, seizures , and loss of consciousness . [ 1 ] While liver toxicity typically occurs in the syndrome, jaundice usually does not. [ 2 ]