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[Optic nerve head circulation in alloxan-induced diabetic rabbits]
1Department of Ophthalmology, Faculty of Medicine, Tottori University, Japan.
Nippon Ganka Gakkai Zasshi
|February 1, 1995
Summary
Diabetic rabbits showed normal optic nerve head blood flow at low intraocular pressure (IOP). However, elevated IOP significantly reduced blood flow in diabetic rabbits, suggesting microcirculation damage.
Area of Science:
- Ophthalmology
- Diabetology
- Physiology
Context:
- Diabetes mellitus can affect ocular microcirculation.
- The optic nerve head is particularly vulnerable to blood flow changes.
- Early detection of microcirculatory dysfunction is crucial.
Purpose:
- To investigate optic nerve head blood flow in alloxan-induced diabetic rabbits.
- To assess the impact of varying intraocular pressure (IOP) on optic nerve head blood flow in diabetes.
- To determine if ocular hypertension exacerbates microcirculatory impairment in early diabetes.
Summary:
- Blood flow volume in the optic nerve head was measured using the hydrogen clearance method in diabetic and control rabbits.
- At normal IOP, blood flow was comparable between groups.
- At elevated IOP (25, 35, 45 mmHg), diabetic rabbits exhibited significantly reduced optic nerve head blood flow compared to controls.
Impact:
- Ocular hypertension may damage optic nerve head microcirculation in early diabetes mellitus, even without retinopathy.
- Findings highlight the potential link between diabetes, ocular hypertension, and optic nerve health.
- Suggests a need for monitoring IOP in diabetic patients to prevent optic nerve damage.