Control of high common mode voltage during transthoracic defibrillation.
Control of high common mode voltage during transthoracic defibrillation.
复制标题
经胸除颤期间高共模电压的控制。
DOI：
10.1109/10.476128
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Lerman,BB
中科院分区：
文献类型：
--
作者：
Deale,OC;Ng,KT;Kim,EJ;Lerman,BB
在传递除颤器脉冲期间，心肌产生相对于接地的高共模电压（V/sub cm/），当用双极电极和隔离放大器记录电位梯度时，可以产生差分误差信号。误差信号与V/sub cm/成正比，减小V/sub cm/可提高电位梯度数据的精度。在5只狗身上进行了实验，以确定是否可以使用桥电路控制V/sub cm/。桥式电路由一个5k /spl ω /功率变阻器与狗的胸廓电阻并联组成。变阻器的可变触点与地相连，通过调节变阻器，可以改变心肌上的V/sub / cm/。在每只狗身上，通过不锈钢经胸电极施加20a电击。点接触电极缝合心外膜测量V/sub cm/。结果表明，在给定的心脏电极上，V/sub cm/可以降至接近零。此外，对于所研究的5只狗，当桥电路在心脏内部点平衡时，心脏上测量到的最大V/sub cm/仅为经胸电压的10%。
A high common mode voltage (V/sub cm/) relative to earth ground is produced on the myocardium during the delivery of a defibrillator pulse and can generate a differential error signal when potential gradients are recorded with bipolar electrodes and isolation amplifiers. The error signal is proportional to V/sub cm/, and therefore, a reduction in V/sub cm/ improves the accuracy of the potential gradient data. Experiments were conducted on 5 dogs to determine whether V/sub cm/ can be controlled using a bridge circuit. The bridge circuit consisted of a 5 k/spl Omega/ power rheostat in parallel with the transthoracic resistance of the dog. The variable contact of the rheostat was connected to earth ground, and by adjusting the rheostat, V/sub cm/ on the myocardium could be varied. In each dog, 20 A shocks were delivered through stainless steel transthoracic electrodes. Point contact electrodes sutured to the epicardium were used to measure V/sub cm/. It was determined that V/sub cm/ could be reduced to approximately zero at a given electrode on the heart. In addition, for the 5 dogs studied, the maximum measured V/sub cm/ on the heart was only 10% of the transthoracic voltage when the bridge circuit was balanced for an interior point in the heart.