Electroretinogram changes in patients and carriers with Leber hereditary optic neuropathy / 中华眼底病杂志

ABSTRACT

Objective:To observe the characteristics of pattern electroretinogram (PERG) and the photopic negative response (PhNR) of flash electroretinogram (FERG) in patients and carriers with Leber hereditary optic neuropathy (LHON).Methods:A cross sectional, observational study. Thirty-two patients (64 eyes) diagnosed with LHON (LHON group) and 15 normal members with the same mutation in patient's family (carrier group) were included in this study from February 2021 to November 2021 in the Department of Ophthalmology of Renmin Hospital of Wuhan University. All patients in LHON group were males (100.0%, 32/32) and the average age was 23.34±7.41 years. In the carrier group of 15 cases (30 eyes), there were 2 males (13.3%, 2/15) and 13 females (86.7%, 12/15). The average age was 43.44±7.65 years. Twenty-four healthy subjects (48 eyes) in the same period were selected as the control group. Among them, there were 8 males (33.3%, 8/24) and 16 females (66.7%, 16/24). The average age was 23.42±2.54 years. All subjects were examined with the GT-2008V-VI visual electrophysiology instrument of Chongqing Gotec Medical Equipment Limited Company for PERG and FERG. P50 and N95 amplitudes of PERG and PhNR, a wave and b wave amplitudes of FERG were recorded. The peripapillary retinal nerve fiber layer (pRNFL) thicknesses of the nasal, superior, temporal, inferior and average quadrants were measured by spectral domain optical coherence tomography (SD-OCT). The amplitudes of a wave, b wave, PhNR, P50 wave, N95 wave and pRNFL thickness between the three groups were compared by one-way ANOVA. Pearson correlation analysis was used to analyze the correlation between different parameters.Results:Compared with the control group, the amplitudes of PhNR in LHON group and carrier group decreased significantly ( F=11.973, P<0.001). The results of correlation analysis showed that the amplitude of PhNR in LHON group was significantly correlated with the thickness of nasal and temporal pRNFL ( r=0.249, 0.272; P=0.048, 0.030). There was no significant difference in P50 wave amplitude between patients, carriers and controls ( F=1.342, P=0.265). There was no significant difference in N95 wave amplitude between patients and controls ( P=0.960). Conclusion:The PhNR amplitudes of FERG in LHON patients and carriers decrease significantly compared to controls.