Multifocal electroretinography in retinitis pigmentosa

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Imaging

Background:

• Retinitis pigmentosa (RP) is a group of inherited retinal diseases causing progressive vision loss.
• Early and accurate diagnosis is crucial for managing RP and potential future therapies.

Purpose of the Study:

• To evaluate the diagnostic utility of multifocal electroretinography (mfERG) in clinical settings for detecting retinal changes in patients with retinitis pigmentosa.
• To assess the sensitivity of mfERG in identifying RP-related retinal dysfunction across different stages and forms of the disease.

Main Methods:

• A prospective study involving 38 patients diagnosed with various forms of retinitis pigmentosa and 30 healthy volunteers.
• Multifocal electroretinograms were recorded using the visual evoked response imaging system, analyzing a 30-degree visual field with 61 hexagonal elements.
• Statistical analysis, including the Mann-Whitney U test, was performed on the mfERG data from the left eye of participants.

Main Results:

• mfERG responses were detectable in 71% of RP patients, indicating its utility even with advanced disease.
• Significant reductions in mfERG response density were observed in all retinal eccentricity groups (P < .00001), demonstrating a center-to-periphery progression of retinal dysfunction.
• Elevated implicit times were noted, particularly in the third eccentricity group (P < .0038) and further peripherally (P < .00001), correlating with disease severity.

Conclusions:

• Multifocal electroretinography effectively differentiates between affected and unaffected retinal areas in patients with retinitis pigmentosa.
• Eccentricity-dependent alterations in both amplitude and implicit time, as revealed by mfERG, provide valuable diagnostic information for RP patients.
• mfERG serves as a complementary tool in the clinical evaluation of retinitis pigmentosa, enhancing diagnostic capabilities.