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[Sleep modifies anticholinergic mydriasis]

H Krastel1, E Alexandridis, D Rating

  • 1Universitäts-Augenklinik Heidelberg.

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|August 1, 1996
PubMed
Summary
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Pupil narrowing during sleep, even after mydriatic eye drops, indicates reduced sympathetic tone. Maintaining pupil dilation in sleepy patients requires additional sympathomimetic medication.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Pharmacology

Context:

  • Pupil size reflects alertness and sleep depth.
  • Miosis (pupil narrowing) occurs during sleep, sedation, and anesthesia due to decreased sympathetic tone.
  • Anticholinergic mydriatics (tropicamide, cyclopentolate, atropine) may be less effective in dilating pupils when sympathetic tone is low.

Purpose:

  • To investigate the effect of sleep and reduced sympathetic tone on pupil dilation in children treated with mydriatic eye drops.
  • To determine if parasympatholytic mydriasis is dependent on sympathetic tone.
  • To establish the necessity of sympathomimetic agents for maintaining mydriasis in sedated or sleeping patients.

Summary:

  • Children receiving mydriatic eye drops for diagnostic pupil dilation showed unsatisfactory dilation during sleep.

Related Experiment Videos

  • This reduced response to anticholinergic mydriatics was overcome by administering phenylephrine, a sympathomimetic agent.
  • The study demonstrates that parasympatholytic mydriasis is influenced by sympathetic tone, and sympathomimetics are crucial for maintaining pupil dilation in deep sleep, sedation, or anesthesia.

    • Impact:

    • Highlights the importance of considering sympathetic tone when assessing pupil dilation.
    • Suggests that phenylephrine administration is mandatory for maintaining mydriasis in conditions of reduced sympathetic tone, such as sleep or anesthesia.
    • Provides crucial information for ophthalmologists and anesthesiologists regarding pupil management in specific patient populations.