Electroretinogram Recording for Infants and Children under Anesthesia to Achieve Optimal Dark Adaptation and International Standards
September 3rd, 2020
Adhering to international standards and maintaining retinal dark adaptation are critical to acquire valid full-field electroretinogram responses in the diagnosis and management of inherited retinal diseases. A practical protocol using a portable darkroom is provided to obtain full-field electroretinogram for infants and children under sedation or general anesthesia in the operating room setting.
Overview
This article discusses the importance of adhering to international standards and maintaining retinal dark adaptation for valid full-field electroretinogram (ERG) responses. A practical protocol is provided for conducting ERG tests in infants and children under sedation or general anesthesia.
Key Study Components
Area of Science
- Electrophysiology
- Retinal function testing
- Inherited retinal diseases
Background
- Full-field electroretinogram is a critical test for assessing retinal function.
- Dark adaptation is essential for obtaining reliable ERG responses.
- Testing in young children often requires anesthesia for safety and efficacy.
- Inherited retinal diseases can be detected early through ERG testing.
Purpose of Study
- To optimize retinal dark adaptation for valid ERG responses.
- To establish a protocol for conducting ERG tests in a clinical setting.
- To enhance patient safety during testing in infants and young children.
Methods Used
- Installation of opaque, non-reflective curtains in the operating room.
- Use of translucent red filter films over monitors to minimize light exposure.
- Conducting ERG tests under general anesthesia.
- Selection of appropriate operating room conditions to ensure dark adaptation.
Main Results
- Improved safety and reliability of ERG tests in young patients.
- Successful acquisition of valid ERG responses under anesthesia.
- Protocol facilitates early detection of retinal dysfunction.
- Supports the implementation of gene therapy and clinical trials.
Conclusions
- Adhering to dark adaptation protocols is crucial for accurate ERG testing.
- Testing in a controlled environment enhances patient outcomes.
- Establishing standardized procedures can improve clinical practices.
Frequently Asked Questions
Executive Industry Relevance
Objective retinal function assessment via full-field ERG is critical for early detection of inherited retinal diseases in pediatric populations where subjective visual testing is not feasible. Maintaining retinal dark adaptation under anesthesia ensures reliable biomarker data essential for go/no-go decisions in gene therapy development and clinical trial endpoints. This method supports preclinical-to-clinical translational continuity by enabling consistent, standardized ERG readouts in infants and young children.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of retinal pathway function through objective electrophysiological readouts in disease models.
- Operational Value: Supports functional target validation by quantifying rod and cone photoreceptor responses prior to therapeutic intervention.
Screening & Assay Development
- Scientific Value: Provides standardized, quantitative ERG outputs suitable for assay readiness in retinal dysfunction screening.
- Operational Value: Ensures reproducibility through controlled dark adaptation and minimized environmental light interference.
Translational & Preclinical Research
- Scientific Value: Facilitates disease progression monitoring via longitudinal ERG tracking in models of retinal degeneration.
- Operational Value: Enables cross-functional collaboration by delivering interpretable, ISCEV-standardized data across sites.
Pipeline & Workflow Integration
The method integrates into discovery biology by providing objective retinal functional data that informs target engagement and mechanism of action assessments.
- Discovery Biology: Supports hypothesis testing by measuring retinal responses to light stimuli as a functional readout of retinal health.
- Screening: Enables assay standardization through reproducible dark-adapted and light-adapted ERG recordings under controlled conditions.
- Analytics: Delivers quantitative dependent variable measurements (amplitude, latency) essential for comparing treatment effects across cohorts.
- Translational Research: Connects discovery to preclinical validation by enabling consistent ERG monitoring from early disease models to therapeutic intervention studies.
- Enterprise Reuse: Establishes a reusable capability for multi-site retinal functional assessment in drug development programs.
Operational & Enterprise Impact
- Scientific Value: Predictive confidence in retinal target modulation through objective, quantifiable ERG biomarkers.
- Operational Value: Standardization and reproducibility via adherence to ISCEV protocols and controlled dark adaptation.
- Strategic Value: Improved go/no-go decisions by reducing biological noise in retinal functional readouts.
- Portfolio Impact: Risk-adjusted advancement decisions based on reliable retinal functional data in pediatric populations.
Implementation Considerations
- Requires expertise in electrophysiology and pediatric anesthesia coordination.
- Dependent on infrastructure for operating room darkening and portable darkroom setup.
- Necessitates cross-team standardization between ophthalmology, anesthesia, and electrophysiology teams.
- Involves adaptation considerations for varying pediatric age groups and sedation levels.
- Practical limitation: Ambient light from monitoring equipment must be actively mitigated to maintain dark adaptation.
Biopharma FAQs
Chapters in this video
0:04
Introduction
1:08
Operating Room and Foldable Portable Darkroom Modification
2:09
Patient Preparation and Retinal Dark Adaption
3:25
Dark-Adapted Full Field Electroretinogram (ffERG) Recording
5:20
Light-Adapted ffERG Recording
6:21
Results: Representative ffERG Responses
7:53
Conclusion
