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Blood viscosity in ocular hypertension
P Garcia-Salinas1, G E Trope, M Glynn
1Department of Ophthalmology, University of Toronto, Toronto General Hospital, Ont.
Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
|December 1, 1988
Summary
Higher blood viscosity is linked to nerve damage in primary open-angle glaucoma patients. Ocular hypertension patients may be protected by lower blood viscosity due to lower hematocrit levels.
Area of Science:
- Ophthalmology
- Rheology
- Medical Science
Background:
- Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
- Understanding factors contributing to POAG pathogenesis is crucial for developing effective treatments.
- Blood rheology, including viscosity and hematocrit, may play a role in ocular diseases.
Purpose of the Study:
- To investigate the relationship between blood viscosity and ocular hypertension in patients with primary open-angle glaucoma.
- To compare blood viscosity and hematocrit levels in POAG patients, ocular hypertension patients, and healthy controls.
Main Methods:
- Blood viscosity and hematocrit were measured in 27 POAG patients, 15 ocular hypertension patients, and 18 healthy controls.
- Participants were matched for sex, blood pressure, and smoking habits.
- Viscosity was assessed at three different shear rates.
Main Results:
- Mean blood viscosity was significantly higher in the POAG group compared to both ocular hypertension and control groups across all shear rates.
- No significant difference in blood viscosity was observed between the ocular hypertension and control groups.
- Mean hematocrit was significantly lower in the ocular hypertension group than in the POAG and control groups.
Conclusions:
- Elevated blood viscosity may be a contributing factor to nerve damage in primary open-angle glaucoma.
- Lower hematocrit levels in ocular hypertension patients might lead to reduced blood viscosity, potentially offering some protection against optic nerve damage.