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Related Experiment Videos

Retinal vascular autoregulation in normal subjects

H Tachibana, F Gotoh, Y Ishikawa

    Stroke
    |March 1, 1982
    PubMed
    Summary

    Aging reduces the ability of retinal arteries to adjust to blood pressure changes. This study found that older individuals have decreased retinal arterial reactivity, impacting this autoregulatory mechanism.

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    Area of Science:

    • Ophthalmology
    • Physiology
    • Gerontology

    Background:

    • The retinal arterial system exhibits autoregulation to maintain stable blood flow despite fluctuations in systemic blood pressure.
    • Aging is known to affect vascular function, but its specific impact on retinal artery autoregulation requires further investigation.

    Purpose of the Study:

    • To investigate the autoregulatory response of retinal arteries to changes in mean arterial blood pressure (MABP).
    • To determine the influence of aging on the reactivity of retinal arteries to perfusion pressure variations.

    Main Methods:

    • Utilized a fundus camera to measure retinal arterial diameter in 65 healthy subjects.
    • Induced a reduction in effective MABP by changing posture from recumbent to erect.
    • Quantified retinal arterial reactivity as the percentage change in diameter per unit change in MABP.

    Main Results:

    • A small but significant increase in retinal arterial diameter was observed upon reduction of perfusion pressure in all participants.
    • Retinal arterial reactivity significantly decreased with advancing age (p < 0.01).
    • No significant correlation was found between retinal arterial reactivity and the absolute diameter of retinal arteries or systemic MABP levels.

    Conclusions:

    • The retinal artery possesses an autoregulatory mechanism that actively adjusts arterial diameter in response to perfusion pressure changes.
    • This autoregulatory capacity of the retinal artery is demonstrably impaired by the aging process.

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