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Development of Evaluation of Swallowing Using Neck Electrical Impedance

利用颈部电阻抗进行吞咽评估的进展

基本信息

批准号：
08680929
负责人：
YAMAMOTO Yoshitake
金额：
$ 1.54万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

We have proposed impedance pharyngograpy (IPG) which is a new evaluation method of swallowing disorders, In the measuring method of IPG is used the four-electrode technique, which is hardly influenced by skin impedance, based on sinusiodal constant current (50 kHz, 0.5 mA). The equivalent series resistance of the evaluated part is measured as impedance using synchronous rectified method. Considering the below mentioned frequency characteristics of IPG, the cut-off frequency of low pass filter is decided as 25 Hz. The electrodes are non-polarization Ag-AgCl skin surface type of 10 mm diameter.We decided the locations of electrodes, considering the conditions about the location of the measured part and change value of impedance. The location of current electrodes is a point of meeting the following two straight lines. The one line joins angle of mandible and condyloid process of mandible. The other line is parallel to mandible and this line is required that adhesive collars for electrodes is on the border between neck and chin. The location of potential electrodes is on line parallel to mandible and inside of the location current ones. The distance between electrodes is 25 mm. A subject sits on a chair and keeps 10 cc water in his mouth. The angle of the chair back is 75 deg.The changes of impedance is caused by the changes of the sharp of esophagus with movement of the bolus of food. We found that the period of main impedance decrease was the same period of pharynx. The phase of swallowing in normal subject can be divided by IPG.The power spectrum density in frequency component of more than 10 Hz is less than -60 dB, From this view point one may say that information about swallowing movement almost includes frequency component of less than 10 Hz.This method can be applied for diagnosis of swallowing disorders. Our future study is to investigate diagnosis considering patterns of IPG using normals and patients data.

提出了一种新的评价吞咽障碍的方法--阻抗咽图(IPG)。在IPG的测量方法中，采用了基于正弦波恒电流(50 kHz，0.5 mA)的四电极技术，几乎不受皮肤阻抗的影响。用同步整流法测量被测部分的等值串联电阻作为阻抗。考虑到IPG的上述频率特性，确定低通滤波器的截止频率为25赫兹。电极为直径10 mm的非极化Ag-AgCl型皮肤表面型电极，根据被测部位的位置和阻抗变化值的大小确定电极的位置。电流电极的位置是以下两条直线相交的点。一条线连接下颌角和下颌骨髁突。另一条线与下颌平行，这条线要求电极的粘合环在颈部和下巴的边界上。电位电极的位置在平行于下颌骨的线上，在位置电流电极的内部。电极之间的距离为25 mm。受试者坐在椅子上，嘴里含着10毫升的水。座椅靠背的角度为75°，阻抗的变化是由于食道尖角随食物团的移动而变化。我们发现，主阻抗下降的周期与咽部相同。正常人吞咽时相可用IPG进行划分，大于10赫兹的频率分量功率谱密度小于-60分贝，从这个角度来看，有关吞咽运动的信息几乎包括小于10赫兹的频率分量，该方法可用于吞咽障碍的诊断。我们未来的研究是利用正常人和患者的数据来研究IPG的诊断模式。