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小波变换提取谷氨酸代谢对大鼠视网膜电图b波的时频域贡献特征

, PP. 1200-1203

Keywords: 谷氨酸代谢,谷氨酰胺合成酶,b波,小波分析

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Abstract:

目的通过建立Müller细胞内谷氨酰胺合成酶损伤模型,探讨b波的时频域特征,检测谷氨酸代谢对b波时频域的影响。方法大鼠(Rcs-rdy?-p?)右眼注射4μL不同浓度(7、70、140μg/μL)的谷氨酸合成酶抑制剂(DL-AAA),左眼注射等计量PBS作为对照组。采用RETI-scan系统,环形角膜电极和不锈钢针状电极,记录18只30d龄大鼠系列暗适应视网膜电图。导出数据后,在Matlab7.1环境下自编程序行小波分析。行配对样本t检验统计学分析。结果时域特征:随着DL-AAA浓度的增加,a、b波的幅值降低。在低浓度时双眼间无统计学差异,中、高浓度实验组a、b波幅值较对照组均明显降低(P<0.05,P<0.01),而b波的峰时未见明显变化。高浓度时,b/a及T1/2d均出现明显变化。频域特征:在设定包络阈值为0.8时,归一化处理后发现,低浓度时最小环比基本重合,而随着药物浓度的增加,实验组最小环比则明显增高(P<0.05),且离散度增高,同时最高峰值的时间点后延(P<0.05)。结论抑制谷氨酰胺合成酶后,视网膜内谷氨酸代谢出现异常,该变化对b波的贡献在时域上体现为早期成分,在频域上体现为慢相低频成分,且对维持视网膜功能稳定性起到重要作用。

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