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Related Experiment Videos

Verapamil increases outflow facility in the human eye

K A Erickson1, A Schroeder, P A Netland

  • 1Department of Ophthalmology, Harvard Medical School, Boston, USA.

Experimental Eye Research
|November 1, 1995
PubMed
Summary

Verapamil, a calcium channel antagonist, reduces eye pressure by increasing fluid outflow. This study shows verapamil dose-dependently enhances outflow facility in human eyes, explaining its therapeutic effect.

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Area of Science:

  • Ophthalmology
  • Pharmacology
  • Physiology

Background:

  • Verapamil is a calcium channel antagonist known to reduce intraocular pressure (IOP).
  • The mechanism by which verapamil lowers IOP is not fully understood.
  • Increased aqueous humor outflow facility is a potential mechanism for IOP reduction.

Purpose of the Study:

  • To investigate if verapamil increases outflow facility in human eyes.
  • To determine the dose-response relationship between verapamil concentration and outflow facility.

Main Methods:

  • Human donor eyes were used for perfusion studies.
  • Anterior segments were perfused with varying concentrations of verapamil hydrochloride (10^-10 to 10^-3 M) under constant pressure.
  • Outflow facility was measured by comparing perfusion rate to pressure.

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Main Results:

  • Verapamil demonstrated a dose-related increase in outflow facility.
  • The maximal increase in outflow facility was 64% above baseline at a verapamil concentration of 10^-9 M.
  • This effect was observed across the tested range of verapamil concentrations.

Conclusions:

  • Verapamil significantly increases outflow facility in human eyes.
  • The observed increase in outflow facility likely accounts for the IOP-lowering effect of topical verapamil.
  • Verapamil represents a potential therapeutic agent for managing elevated intraocular pressure.