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Related Experiment Videos

Retest variability and diurnal effects in the pattern electroretinogram

T Otto1, M Bach

  • 1Universitäts-Augenklinik, Freiburg, Germany.

Documenta Ophthalmologica. Advances in Ophthalmology
|January 1, 1996
PubMed
Summary

Pattern electroretinography (PERG) amplitude reproducibility is within +/- 10% for most subjects. Diurnal variations in PERG amplitude, though small, are similar in size and may impact longitudinal studies.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Electrophysiology

Background:

  • The pattern electroretinogram (PERG) is a key electrophysiological test in ophthalmology.
  • Standardized protocols, like those from the International Society for Clinical Electrophysiology of Vision (ISCEV), are crucial for reliable PERG measurements.
  • Understanding the reproducibility and diurnal variability of PERG is essential for accurate clinical interpretation and longitudinal tracking of visual function.

Purpose of the Study:

  • To assess the intersession reproducibility of PERG amplitudes and latencies under ISCEV-like conditions.
  • To investigate the diurnal variability of PERG responses over a 15-hour period.
  • To determine the potential impact of diurnal fluctuations on the reliability of PERG measurements in clinical practice.

Main Methods:

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  • Pattern electroretinograms were recorded using DTL electrodes with phase-reversing checkerboard stimuli (0.4, 0.8, 16 degrees check sizes).
  • Both transient (2 reversals/s) and steady-state (16 reversals/s) PERGs were recorded in 42 eyes from 21 subjects, with repeat measurements after one week.
  • Diurnal variability was assessed by recording PERGs in 10 subjects across a 15-hour period to analyze amplitude and latency changes throughout the day.

Main Results:

  • The intersession coefficient of variation for steady-state PERG amplitude was 7% +/- 5%, and for transient PERG amplitude was 9.5% +/- 7%.
  • Transient PERG P50 latency showed high reproducibility with a coefficient of variation of 1.5% +/- 2%.
  • Mean PERG amplitude exhibited a diurnal variation of approximately 7% (p < 0.001), with a peak in the morning and a trough in the afternoon, affecting N95 and steady-state amplitudes more than P50 amplitudes.

Conclusions:

  • PERG amplitude demonstrates good intersession reproducibility, generally within +/- 10% for approximately 70% of measurements.
  • Diurnal variations in PERG amplitude are statistically significant but relatively small (3-10%), comparable to reproducibility variability.
  • These diurnal effects, while modest, should be considered in the design and interpretation of longitudinal PERG studies to ensure accurate assessment of visual system changes.