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Neyro-Ophthalmic Literature Review

机译:神经眼科文献综述

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The pattern electroretinogram (PERG) waveform consists of the P50 (positive peak at -50 ms) and the N95 (negative trough at 95 ms). The latter is thought to represent retinal ganglion cell (RGC) function. Therefore, the ratio of N95/P50 in PERG can be used to differentiate between visual loss due to a optic neuropathy from that due to a maculopathy. However, the standard PERG does not detect localized neuronal loss. Multifocal PERG (mfPERG) is an emerging technique, which could theoretically reveal localized RGC dysfunction. It has been studied in glaucoma patients but a significant correlation between mfPERG and visual field defects has not been demonstrated. The mfPERG system used in this study employed a stimulus screen which had 19 rectangles of 12 black-and-white squares each, subtending a total visual angle of 24deg, which was roughly equivalent to the Humphrey visual field (HVF) 24-2. The waveform from the mfPERG consisted of a small initial negative component (N1), a large positive component at ~50ms (P1), and a large negative component at ~95ms (N2). In this study, the authors performed mfPERG and HVF 24-2 measurements in 23 eyes of 23 patients with temporal visual field defects (complete and incomplete) from pituitary adenoma-induced chiasmal compression (treated) and compared the results with 21 normal controls. It was found that when the mfPERG responses were analysed in terms of subset of rectangles in hemifields and quadrants, the P1 and N2 amplitudes were reduced in the temporal hemifields and supero-temporal quadrants in the chiasmal compression patients compared with normals. The mfPERG amplitudes also correlated significantly with HVF relative sensitivity in different quadrants/hemifields. The correlation was better with P1 than with N2, which was somewhat different to the full-field PERG where N95 is more affected than P50 in optic nerve disorders. This study provided preliminary evidence that mfERG could be used as an indicator for localized RGC dysfunction.
机译:模式视网膜电图(PERG)波形由P50(-50毫秒处的正峰值)和N95(95毫秒处的负谷)组成。后者被认为代表视网膜神经节细胞(RGC)功能。因此,PERG中N95 / P50的比率可用于区分由于视神经病变引起的视力丧失与因黄斑病变引起的视力丧失。但是,标准PERG不能检测到局部神经元丢失。多焦点PERG(mfPERG)是一项新兴技术,理论上可以揭示局部性RGC功能障碍。已在青光眼患者中进行了研究,但尚未证明mfPERG与视野缺损之间存在显着相关性。在本研究中使用的mfPERG系统采用了一个激励屏幕,该屏幕具有19个矩形,每个矩形具有12个黑白正方形,其总视角为24度,大致相当于汉弗莱视野(HVF)24-2。来自mfPERG的波形由一个小的初始负分量(N1),一个在〜50ms(P1)处的大正分量和一个在〜95ms(N2)处的大负分量组成。在这项研究中,作者对垂体腺瘤诱导的颊侧压迫(治疗)的23例颞视野缺损(完全和不完全)患者的23只眼进行了mfPERG和HVF 24-2测量,并将结果与​​21个正常对照进行了比较。结果发现,当根据半场和象限中矩形的子集分析mfPERG响应时,与正常人相比,the骨压迫患者的颞半场和颞上象限的P1和N​​2幅度减小。在不同象限/半场中,mfPERG振幅也与HVF相对灵敏度显着相关。 P1与N2的相关性更好,这与全视野PERG有所不同,后者在视神经疾病中N95比P50受影响更大。这项研究提供了初步的证据,证明mfERG可以用作局部RGC功能障碍的指标。

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