✦ LIBER ✦

Sensitivity for detecting fibrillation potentials: A comparison between concentric and monopolar needle electrodes

✍ Scribed by Howard B. Sherman; Dr. Francis O. Walker; Peter D. Donofrio

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 300 KB
Volume: 13
Category: Article
ISSN: 0148-639X
DOI: 10.1002/mus.880131104

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

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 < .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.

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