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Related Experiment Videos

Clinical estimation of corneal endothelial pump function.

W M Bourne1

  • 1Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota, USA.

Transactions of the American Ophthalmological Society
|June 9, 1999
PubMed
Summary

A new technique estimates corneal endothelial pump rate, finding it significantly reduced only in corneal transplant patients, not in diabetics or contact lens wearers.

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Area of Science:

  • Ophthalmology
  • Corneal Physiology
  • Endothelial Function

Background:

  • Corneal hydration is maintained by a pump-leak mechanism.
  • Endothelial function is crucial for corneal clarity.
  • Previous methods lacked a comprehensive assessment of both pump and leak functions.

Purpose of the Study:

  • To develop and validate a technique for estimating the corneal endothelial pump rate in human subjects.
  • To assess corneal endothelial pump function in various patient groups and under specific conditions.

Main Methods:

  • Developed a method to estimate relative endothelial pump rate using deswelling rate and endothelial permeability to fluorescein.
  • Applied the technique to normal subjects, diabetic patients, corneal transplant recipients, and contact lens wearers.
  • Investigated the effect of topical dorzolamide on endothelial pump rate.

Main Results:

  • The relative endothelial pump rate was significantly decreased in corneal transplant patients.
  • No significant difference in pump rate was observed in diabetic patients, contact lens wearers, or after dorzolamide administration compared to controls.
  • Corneal transplant patients showed a reduced permeability (leak) despite the decreased pump rate.

Conclusions:

  • The developed method effectively estimates both barrier and pump functions of the corneal endothelium.
  • This technique is valuable for investigating the causes of functional endothelial insufficiency.
  • Corneal transplantation significantly impacts endothelial pump function.

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