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Related Experiment Videos

Optic disc blood flow

J T Ernest

    Transactions of the Ophthalmological Societies of the United Kingdom
    |September 1, 1976
    PubMed
    Summary

    Optic disc blood flow in rhesus monkeys was measured at 95.4 ml/min/100 g. Intraocular pressure elevation above 40 mm Hg significantly reduced this blood flow, with reactive hyperemia upon pressure normalization.

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    Area of Science:

    • Ophthalmology
    • Physiology
    • Vascular Biology

    Background:

    • Optic disc blood flow is crucial for retinal health.
    • Understanding its regulation is vital for treating optic neuropathies.
    • Previous studies have limited data on optic disc perfusion dynamics.

    Purpose of the Study:

    • To quantify optic disc blood flow in rhesus monkeys.
    • To investigate the impact of elevated intraocular pressure on optic disc perfusion.
    • To observe the hemodynamic response following intraocular pressure reduction.

    Main Methods:

    • Hydrogen gas clearance technique was employed to measure tissue blood flow.
    • Optic disc blood flow was assessed in rhesus monkeys.
    • Intraocular pressure was manipulated to evaluate its effects on blood flow.

    Main Results:

    • The mean optic disc blood flow was determined to be 95.4 +/- 15.5 ml/min/100 g.
    • Optic disc blood flow remained largely unaffected until intraocular pressure reached approximately 40 mm Hg.
    • A rapid decline in blood flow was observed above 40 mm Hg, followed by reactive hyperemia upon pressure normalization.

    Conclusions:

    • Optic disc blood flow exhibits autoregulation up to a certain intraocular pressure threshold.
    • Elevated intraocular pressure significantly compromises optic disc perfusion.
    • Reactive hyperemia suggests a compensatory vascular response to pressure changes.

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