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Direct-Acting Cholinergic Agonists: Therapeutic Uses01:11

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Direct-acting cholinergic agonists have many therapeutic uses in various medical fields. Choline esters, including acetylcholine, have limited clinical utility due to their non-selectivity and short duration of action. Still, acetylcholine and carbachol are applied topically during ophthalmologic surgery to induce miosis. Pilocarpine, a muscarinic and ganglionic stimulator, effectively treats open-angle glaucoma and alleviates xerostomia and dry mouth caused by radiotherapy or Sjögren...
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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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Direct-Acting Cholinergic Agonists: Pharmacological Actions00:59

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Direct-acting cholinergic agonists exert their pharmacological actions by mimicking the effects of acetylcholine on postsynaptic muscarinic receptors to generate parasympathetic responses. These agents elicit a range of physiological responses, including cardiovascular effects. For example, activation of muscarinic receptors induces bradycardia, decreased cardiac output, reduced peripheral resistance, and consequent hypotension. In the eye, stimulation of M3 receptors leads to smooth muscle...
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Sedatives and Hypnotics Drugs: Miscellaneous Agents01:17

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Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
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Adrenergic Agonists: Therapeutic Uses01:30

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Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies.
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Cholinergic Antagonists: Pharmacokinetics01:24

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Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations,  while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and...
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Related Experiment Video

Updated: Jun 21, 2025

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Apraclonidine-An eye opener.

Fabienne C Fierz1, Leah R Disse1,2, Christopher J Bockisch1,2,3

  • 1Department of Ophthalmology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.

Frontiers in Ophthalmology
|July 10, 2024
PubMed
Summary

Apraclonidine eye drops effectively reverse anisocoria in Horner

Keywords:
Apraclonidine testHorner’s syndromeMuller’s muscleanisocoriaeyelid apertureptosis

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Area of Science:

  • Ophthalmology
  • Neuroscience

Background:

  • Apraclonidine eye drops are used to test for Horner's syndrome.
  • The drug's effect on eyelid position is mediated by alpha-1 adrenergic receptors in Muller's muscle.

Purpose of the Study:

  • To quantitatively assess the effect of apraclonidine on eyelid position in Horner's syndrome patients versus physiological anisocoria.
  • To determine if pupillometry can improve apraclonidine test diagnostic accuracy.

Main Methods:

  • Infrared video recordings from pupillometry were used to measure vertical eyelid position before and after apraclonidine 1% instillation in 36 patients.
  • Receiver operating characteristic curves were calculated to find the optimal cutoff for eyelid aperture change.

Main Results:

  • A decrease in inter-eye difference of eyelid aperture greater than 0.42 mm was discriminative of Horner's syndrome.
  • This diagnostic criterion showed 80% sensitivity and 75% specificity.
  • The eyelid-elevating effect of apraclonidine was more pronounced in eyes with sympathetic denervation deficit.

Conclusions:

  • The apraclonidine test demonstrates an eyelid-elevating effect, particularly in Horner's syndrome.
  • Measuring eyelid aperture changes during pupillometry can enhance the diagnostic accuracy of the apraclonidine test for Horner's syndrome.