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Effect of ocular perfusion pressure on retinal function in the rabbit
J M Harrison1, J W Kiel, S Smith
1Department of Ophthalmology, University of Texas Health Science Center, San Antonio 78284, USA. harrisonj@uthscsa.edu
Vision Research
|October 24, 1997
Summary
The rabbit electroretinogram (ERG) remains stable across a broad range of blood perfusion pressures. This study shows the ERG is resilient, even when mean arterial pressure (MAP) fluctuates significantly.
Area of Science:
- Ophthalmology
- Neuroscience
- Physiology
Background:
- The electroretinogram (ERG) measures retinal electrical activity.
- Understanding the relationship between retinal perfusion pressure and ERG function is crucial for diagnosing visual system disorders.
Purpose of the Study:
- To investigate the relationship between electroretinogram (ERG) function and mean arterial pressure (MAP) in anesthetized rabbits.
- To determine the range of perfusion pressures over which the rabbit ERG remains functional.
Main Methods:
- Anesthetized rabbits underwent mechanically induced changes in MAP.
- Electroretinograms (ERGs) were recorded at various perfusion pressures (10-95 mmHg) during brief (30-60 sec) and sustained (5 min) periods.
- B-wave amplitude changes were analyzed in relation to perfusion pressure.
Main Results:
- The b-wave amplitude of the ERG showed no significant change with varying perfusion pressures during both brief and sustained MAP manipulations.
- The ERG b-wave was nearly abolished within 5 minutes post-mortem, indicating a dependence on immediate physiological function.
- Rabbit ERG function is maintained across a wide spectrum of perfusion pressures.
Conclusions:
- The rabbit electroretinogram (ERG) is remarkably stable and functional over an extensive range of perfusion pressures.
- Retinal function, as assessed by ERG, is resilient to significant fluctuations in systemic blood pressure within physiological limits.