Influence of frequency and temperature on the mechanisms of nerve conduction block induced by high-frequency biphasic electrical current

被引:24
作者
Wang, Jicheng [1 ]
Shen, Bing [1 ]
Roppolo, James R. [1 ]
de Groat, William C. [1 ]
Tai, Changfeng [1 ]
机构
[1] Univ Pittsburgh, Dept Pharmacol, Pittsburgh, PA 15261 USA
关键词
axon; block; model; temperature; frequency; stimulation;
D O I
10.1007/s10827-007-0050-x
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The influences of stimulation frequency and temperature on mechanisms of nerve conduction block induced by high-frequency biphasic electrical current were investigated using a lumped circuit model of the myelinated axon based on Schwarz and Eikhof (SE) equations. The simulation analysis showed that a temperature-frequency relationship was determined by the axonal membrane dynamics (i.e. how fast the ion channels can open or close.). At a certain temperature, the axonal conduction block always occurred when the period of biphasic stimulation was smaller than the action potential duration (APD). When the temperature decreased from 37 to 15 degrees C, the membrane dynamics slowed down resulting in an APD increase from 0.4 to 2.4 ms accompanied by a decrease in the minimal blocking frequency from 4 to 0.5 kHz. The simulation results also indicated that as the stimulation frequency increased the mechanism of conduction block changed from a cathodal/anodal block to a block dependent upon continuous activation of potassium channels. Understanding the interaction between the minimal blocking frequency and temperature could promote a better understanding of the mechanisms of high frequency induced axonal conduction block and the clinical application of this method for blocking nerve conduction.
引用
收藏
页码:195 / 206
页数:12
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