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Related Experiment Videos

Retinal circulation responses to systemic autonomic nerve stimulation.

L P Lanigan1, C V Clark, D W Hill

  • 1Research Department of Ophthalmology, Royal College of Surgeons of England, London.

Eye (London, England)
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Autonomic nervous system stimulation via isometric exercise caused significant retinal vessel constriction in healthy subjects. This response was observed with both parasympatholytic and sympathetic agents, indicating a link between systemic nerve activity and retinal vasculature.

Area of Science:

  • Ophthalmology
  • Autonomic Neuroscience
  • Physiology

Background:

  • The autonomic nervous system regulates involuntary bodily functions, including blood vessel tone.
  • Retinal vessel calibre changes can reflect systemic physiological responses.
  • Understanding the relationship between autonomic stimulation and retinal vasculature is crucial for diagnosing and managing various health conditions.

Purpose of the Study:

  • To investigate the effect of controlled autonomic nervous system stimulation on retinal vessel calibre.
  • To compare the responses using parasympatholytic (tropicamide) and sympathetic (phenylephrine) agents.
  • To determine if changes in diastolic blood pressure correlate with retinal vessel constriction.

Main Methods:

  • 10 healthy subjects underwent sustained isometric muscle contraction (handgrip) as a stimulus.

Related Experiment Videos

  • Ocular measurements were taken using two different mydriatic agents: tropicamide 1% and phenylephrine 10%.
  • Retinal arteriolar and venule diameters were measured, along with diastolic blood pressure.

    • Main Results:

    • Both tropicamide and phenylephrine induced significant arteriolar and venule constriction (p < 0.001).
    • Mean arteriolar constriction was approximately 8.1-8.6%, and venule constriction was 3.7-4.8%.
    • No significant difference in vessel calibre was found during recovery or between the two agents; no correlation was observed between blood pressure rise and vessel constriction.

    Conclusions:

    • Systemic autonomic nerve stimulation is significantly associated with changes in retinal vessel calibre.
    • The observed retinal vessel constriction suggests a direct link between autonomic activity and the ocular vasculature.
    • Further research is warranted to elucidate the precise mechanisms underlying this response.