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ISCEV extended protocol for the dark-adapted red flash ERG.

Dorothy A Thompson1,2, Kaoru Fujinami3,4,5, Ido Perlman6

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Summary
This summary is machine-generated.

The dark-adapted red flash electroretinogram (ERG) extends standard protocols to diagnose cone and rod system dysfunctions. This extended ERG test aids in identifying specific retinal disorders, especially in children.

Keywords:
Clinical standardsDark-adapted (DA)Electroretinogram (ERG)Full-field ERGInternational Society of Clinical Electrophysiology of Vision (ISCEV)Red flash ERGRetinal dystrophy

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Area of Science:

  • Ophthalmology
  • Clinical Electrophysiology
  • Retinal Imaging

Background:

  • The International Society for Clinical Electrophysiology of Vision (ISCEV) provides a standard for full-field electroretinography (ERG).
  • The standard protocol encourages but does not mandate extended testing for comprehensive retinal evaluation.
  • There is a need for extended ERG protocols to diagnose specific retinal conditions more effectively.

Purpose of the Study:

  • To describe an extended protocol for the dark-adapted (DA) red flash electroretinogram (ERG).
  • To detail the utility of the DA red flash ERG in diagnosing various cone and rod system dysfunctions.
  • To highlight the adaptability of the DA red flash ERG for abbreviated protocols, particularly in pediatric cases.

Main Methods:

  • The DA red flash ERG is incorporated into the ISCEV standard ERG protocol.
  • It is recorded after a minimum of 20-minute dark adaptation (DA) and the DA 0.01 ERG.
  • A flash strength of 0.3 phot cd s m⁻² elicits a waveform with distinct cone- and rod-mediated components.

Main Results:

  • Healthy individuals exhibit a two-peaked waveform: an early cone-mediated x-wave (30-50 ms) and a later rod-mediated b-wave (~100 ms).
  • The DA red flash ERG aids in diagnosing achromatopsia, cone dystrophies, and "Bradyopsia" when the x-wave is present without standard LA ERGs.
  • It helps differentiate the origin of residual DA ERGs in severe rod dysfunction, including vitamin A deficiency and Oguchi disease.

Conclusions:

  • The DA red flash ERG is a valuable extension to the ISCEV standard, enhancing diagnostic capabilities for retinal disorders.
  • This extended ERG protocol is particularly useful for identifying cone system dysfunction and assessing rod function.
  • The DA red flash ERG's flexibility allows for shorter adaptation times, making it suitable for abbreviated pediatric ERG testing.