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Cerebral metabolism in chronic ocular ischemia
K Yamaguchi1, M Kiyosawa, M Ito
1Department of Ophthalmology, School of Medicine, Tohoku University, Miyagi, Japan.
Summary
Ophthalmic artery steal phenomenon in glaucoma patients indicates critical cerebral blood flow. This condition, known as misery perfusion, highlights severe circulatory compromise in the brain.
Area of Science:
- Neurology
- Ophthalmology
- Medical Imaging
Background:
- Neovascular glaucoma can be associated with internal carotid artery obstruction.
- Ophthalmic artery steal phenomenon involves reversed blood flow through the ophthalmic artery.
Observation:
- Digital subtraction angiography revealed ophthalmic artery steal in two glaucoma patients with carotid obstruction.
- Positron emission tomography was used to assess cerebral metabolic state.
Findings:
- Patients showed reduced regional cerebral blood flow and metabolism for oxygen and glucose.
- Increased regional oxygen and glucose extraction ratios were observed.
Implications:
- The findings suggest chronic ocular ischemia can lead to a critical state of cerebral perfusion.
- This state, termed misery perfusion, indicates compromised brain function due to inadequate blood supply.