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Is Ahmed Glaucoma Valve Consistent in Performance?

Nikhil S Choudhari1, Swathi Vallabh Badakere1, Ashutosh Richhariya2

  • 1VST Glaucoma Centre, Dr. Kallam Anji Reddy Campus, L V Prasad Eye Institute, Hyderabad, India.

Translational Vision Science & Technology
|June 28, 2018
PubMed
Summary

This study evaluated the Ahmed glaucoma valve (AGV) in vitro, finding variable performance. Priming resistance did not impact the AGV's opening or closing pressures, potentially explaining clinical outcome variations.

Keywords:
Ahmed glaucoma valveflow characterizationglaucoma drainage devicepriming

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Glaucoma drainage devices, such as the Ahmed glaucoma valve (AGV), are crucial for managing intraocular pressure.
  • Understanding the in vitro performance of these devices is essential for predicting clinical efficacy.

Purpose of the Study:

  • To investigate the in vitro mechanism of action and flow characteristics of the Ahmed glaucoma valve (AGV) under simulated physiological conditions.
  • To evaluate the effect of priming resistance on the performance of the AGV.

Main Methods:

  • Newly opened AGV devices were connected to manometers and primed with saline.
  • Devices were placed in a saline bath and infused with saline at 3 μL/min for 24 hours.
  • Pressure readings were recorded using digital manometers at 4 Hz.

Main Results:

  • The Ahmed glaucoma valve (AGV) demonstrated valve-like functionality with distinct transient and steady phases.
  • Opening and closing pressures were 13 and 7 mm Hg, respectively, with pressure fluctuations of 6 mm Hg.
  • Priming resistance showed no significant correlation with opening or closing pressures (ρ = -0.13, P = 0.72 and ρ = -0.36, P = 0.33).

Conclusions:

  • The Ahmed glaucoma valve (AGV) functions as a valve, but exhibits variable in vitro performance.
  • Priming resistance does not influence the AGV's opening and closing pressures.
  • Observed in vitro variability may contribute to differences in clinical outcomes.