THE PROGNOSTIC VALUE OF THE ELECTRORETINOGRAM IN THROMBOSIS OF THE RETINAL VEINS
THE PROGNOSTIC VALUE OF THE ELECTRORETINOGRAM IN THROMBOSIS OF THE RETINAL VEINS
复制标题
视网膜电图对视网膜静脉血栓形成的预后价值
DOI：
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发表时间：
1962
期刊：
影响因子：
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通讯作者：
M. Germanis
中科院分区：
文献类型：
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作者：
G. Karpe;M. Germanis
在临床视网膜电图中，从视网膜的整个区域获得总响应。在半暗适应的标准化状态下，眼睛的单闪光视网膜电图（卡佩1948）给出了整个视网膜的所有电位的总和。由于暗适应使视网膜的阈值降低，来自接触镜和眼介质的杂散光将刺激整个视网膜。因此，在这种记录中，不可能记录来自视网膜的小的被照射部分的响应。视网膜的循环障碍与视网膜电图（ERG）上显示的功能障碍相关。b电位的大小发生改变，b波和a波之间的平衡也发生改变。卡佩（1915）和蔡德勒（1959）研究了从正常眼获得的ERG曲线（图1，A：1和2）、b电位的正常变化和a波的正常出现。(In在这些研究中，a波带的高度是从等电位线或其延长线测量的。）当6波和a波都减小时，就出现了一种病理性偏离，称为ERG低于正常（图1，B：1和2）。如果两个电位都不能用这种方法记录，则ERG被表示为熄灭（图1，D：1和2）。然而，在后一组的某些情况下，可以通过使用特别强的光刺激或分析闪烁函数的特殊方法（Henkes等人，1956）来证明电势的存在。当a波和b波都大于正常值，但相互关系与正常ERG相同时，该曲线表示为超常（图1，C：1）。如果负电位比正常情况下更显著，则ERG表示为阴性（卡佩1945）。可以区分两种类型的负性ERG，即负性ERG和负性ERG（Henkes
In clinical electroretinography, a total response is obtained from the whole area of the retina. Single-flash electroretinography from the eye in a standardized state of semi-dark-adaptation (Karpe 1948) gives the sum total of all potentials from the whole retina. Since dark adaptation makes the threshold of the retina low, the stray light from the contact glass and the ocular media will stimulate the whole retina. Consequently, in this recording, it is not possible to register the response from a small, illuminated part of the retina. A circulatory disturbance of the retina is associated with a functional disturbance that can be demonstrated on the electroretinogram (ERG). The size of the b-potential is altered, as well as the balance between the b-wave and a-wave. The ERG curve obtained from the normal eye (Fig. 1, A: 1 and 2 ) , the normal variations in the b-potential and the normal occurrence of the a-wave have been studied by Karpe (1915) and by Zeidler (1959). (In these studies, the height of both the band a-wave is measured from the isoelectric line or its prolongation.) When both 6and a-wave are decreased in size, a type of pathologic deviation occurs that is denoted as a subnormal ERG (Fig. 1, B: 1 and 2). If neither of the potentials is recordable with this method, the ERG is denoted as extinguished (Fig. 1 , D: 1 and 2). In certain cases in the latter group it is, however, possible by using a particularly strong light stimulus, or special methods for analyzing the flicker function (Henkes et al. 1956) to demonstrate the presence of a potential. When both the aand b-wave are larger than normal, but have the same mutual relation as in the normal ERG, the curve is denoted as supernormal (Fig. 1, C : 1). If the negative potentials are more predominant than under normal conditions, the ERG is denoted as negative (Karpe 1945). Two types of negative ERG can be distinguished, namely, negf and neg(Henkes