Oscillatory potentials in patients with birdshot chorioretinopathy

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Imaging

Background:

• The electroretinogram (ERG) is crucial for assessing posterior uveitis.
• Reduced oscillatory potentials (OPs) can occur in uveitic eyes even with normal overall ERG responses.

Purpose of the Study:

• To compare ERG parameters, specifically OPs, between patients with birdshot chorioretinopathy (BCR), other posterior uveitis, and healthy controls.
• To evaluate the diagnostic performance of OPs in BCR detection.

Main Methods:

• Retrospective case-control study involving 64 patients and 93 age-matched controls.
• Fourier analysis to calculate the root-mean-squared (RMS) energy of OPs.
• Comparison of photopic flicker amplitudes/latencies, scotopic b-wave amplitudes, and OP RMS values.
• Receiver operating characteristic (ROC) curve analysis to assess diagnostic performance.

Main Results:

• Mean OP RMS was significantly lower in patients (15.6 µV) versus controls (33.0 µV) (p < 0.001).
• Area under the ROC curves (AUROC) for OP RMS was 0.88, outperforming other ERG parameters.
• OP RMS showed significantly higher AUROC compared to photopic flicker amplitudes (p < 0.001), flicker latencies (p = 0.0032), and scotopic b-wave amplitudes (p < 0.0001).

Conclusions:

• Analysis of OPs demonstrates superior sensitivity and specificity for diagnosing and evaluating birdshot chorioretinopathy compared to standard ERG amplitudes and latencies.
• OPs are a valuable biomarker for BCR and posterior uveitis.