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In Vivo Study of Response Threshold in Retinal Degenerate Model at Different Degenerate Stages

机译:在不同退化阶段视网膜退化模型中的响应阈值的体内研究

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Retinal prostheses are being developed to apply electrical stimulation to the retina in order to restore vision of individuals who suffer from diseases such as retinitis pigmentosa (RP) and aged related macular degeneration (AMD). Various electrical stimulus parameters have been extensively studied in both experimental and clinical settings. Both electrophysiological and psychophysical results have shown that outer retina disease exhibit higher stimulus threshold in one degenerate group versus the control group. Fewer studies have been conducted to investigate the change in threshold currents as a function of different degenerate stages. We propose to study the electrophysiological change in degenerate rat retinas by using an in vivo recording method. We recorded retinal-driven superior colliculus cells response in two control groups and four degenerate groups. Current pulses of seven different stimulus pulse durations were applied to the retinas to obtain strength duration curve per group. Preliminary results showed that for the postnatal (P) day 90 and 180 degenerate groups, threshold currents were not significantly different from the normal control group (P90 and P230). For P300 degenerate group, the threshold currents progressively increased. For P760 degenerate group, threshold currents were significantly elevated across all the stimulus pulse durations tested. Charge densities calculated for P760 degenerate group exceeded the safe limit of the stimulating electrode. Cell morphology in all control and degenerate groups is still under investigation for a correlation study.
机译:视网膜假体正在开发的电刺激应用到视网膜,以恢复从谁的疾病,如视网膜色素变性(RP)和年龄相关性黄斑变性(AMD)遭受个人的愿景。各种电刺激参数已经在实验和临床得到广泛的研究。两个电生理和心理的结果表明,外视网膜病在一个简并组相对于对照组表现出更高的刺激阈值。更少的研究已进行调查不同退化阶段的函数,阈值电流的变化。我们建议使用体内记录方法来研究退化大鼠视网膜的电生理学改变。我们记录在两个对照组和四个简并组视网膜驱动上丘细胞应答。的七个不同的刺激的脉冲持续时间的电流脉冲被施加到视网膜,以获得每组的强度持续时间曲线。初步结果表明,产后(P)90天和180个的简并组,阈值电流是不从正常对照组(P90和P230)显著不同。对于简并P300组,阈值电流逐渐增加。对于简并P760组,阈值电流被显著在所有测试的刺激物的脉冲持续时间升高。对于简并P760组计算电荷密度超过了刺激电极的安全极限。在所有的控制和退化组细胞形态仍在进一步调查中的相关性研究。

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