Sherman H B, Walker F O, Donofrio P D
Department of Neurology, Wake Forest University, Bowman Gray School of Medicine, Winston-Salem, North Carolina 27103.
Muscle Nerve. 1990 Nov;13(11):1023-6. doi: 10.1002/mus.880131104.
The sensitivity of monopolar and concentric electrodes for detecting fibrillation potentials (FP) has never been formally compared. We studied 35 muscles with FP, sampling 20 sites each with concentric and monopolar needles. The concentric needle identified 0.88 +/- 3.44 (mean +/- standard deviation) more sites with spontaneous activity. Although statistically significant (Wilcoxon signed rank test P less than .03), this difference in sensitivity did not appreciably affect diagnostic interpretation. Subjects described the concentric needles as more painful. Needle insertions in 25 other muscles demonstrated that needle movement generated the majority of FP. We suggest that the increased tissue injury caused by concentric needles may account for both their increased sensitivity and discomfort.
单极电极和同心针电极检测纤颤电位（FP）的灵敏度从未进行过正式比较。我们研究了35块有纤颤电位的肌肉，分别用同心针电极和单极针电极在每块肌肉上采集20个位点。同心针电极识别出的有自发活动的位点比单极针电极多0.88±3.44（均值±标准差）个。尽管差异具有统计学意义（Wilcoxon符号秩检验P<0.03），但这种灵敏度差异并未明显影响诊断解读。受试者表示使用同心针电极时更疼。在另外25块肌肉上进行的针电极插入操作表明，针电极移动产生了大部分纤颤电位。我们认为，同心针电极造成的组织损伤增加可能是其灵敏度提高和引起不适的原因。
