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Regional optic nerve blood flow and its autoregulation
Investigative Ophthalmology & Visual Science
|December 1, 1983
Summary
This study measured optic nerve blood flow (ONBF) in cats, revealing a distinct flow gradient along the nerve. ONBF autoregulated effectively to changes in mean arterial blood pressure.
Area of Science:
- Ophthalmology
- Neuroscience
- Physiology
Background:
- Optic nerve blood flow (ONBF) is crucial for vision.
- Understanding regional ONBF is vital for diagnosing and treating optic neuropathies.
- Previous studies have not fully elucidated the regional distribution of ONBF.
Purpose of the Study:
- To measure regional optic nerve blood flow (ONBF) in adult female cats under basal conditions.
- To investigate the autoregulation of ONBF in response to alterations in mean arterial blood pressure (MABP).
Main Methods:
- Utilized 14C-iodoantipyrine autoradiography to quantify regional ONBF.
- Measured flow in six distinct regions: prelaminar, laminar, 1 mm, 4 mm, 6 mm post-laminar, and intracranial optic nerve/chiasm.
- Assessed ONBF changes with induced alterations in MABP.
Main Results:
- Identified a flow gradient with higher ONBF in the prelaminar, laminar, and 1-mm post-laminar segments.
- Observed significantly lower ONBF in the 4-mm, 6-mm post-laminar, and intracranial segments.
- Demonstrated autoregulatory compensation of ONBF across all measured regions with changes in MABP.
Conclusions:
- Optic nerve blood flow exhibits regional heterogeneity, with distinct patterns along its length.
- The optic nerve demonstrates robust autoregulation, maintaining blood flow despite fluctuations in systemic blood pressure.
- Findings provide essential baseline data for understanding optic nerve physiology and pathology.