Jaffe D M, Solomon N P, Robinson R A, Hoffman H T, Luschei E S
Department of Otolaryngology-Head and Neck Surgery, University of Iowa College of Medicine, Iowa City, USA.
Otolaryngol Head Neck Surg. 1998 May;118(5):655-62. doi: 10.1177/019459989811800515.
The use of a specific electrode type in laryngeal electromyography has not been standardized. Laryngeal electromyography is usually performed with hooked-wire electrodes or concentric needle electrodes. Hooked-wire electrodes have the advantage of allowing laryngeal movement with ease and comfort, whereas the concentric needle electrodes have benefits from a technical aspect and may be advanced, withdrawn, or redirected during attempts to appropriately place the electrode.
This study examines whether hooked-wire electrodes permit more stable recordings than standard concentric needle electrodes at rest and after large-scale movements of the larynx and surrounding structures. A histologic comparison of tissue injury resulting from placement and removal of the two electrode types is also made by evaluation of the vocal folds.
Electrodes were percutaneously placed into the thyroarytenoid muscles of 10 adult canines. Amplitude of electromyographic activity was measured and compared during vagal stimulation before and after large-scale laryngeal movements. Signal consistency over time was examined. Animals were killed and vocal fold injury was graded and compared histologically.
Waveform morphology did not consistently differ between electrode types. The variability of electromyographic amplitude was greater for the hooked-wire electrode (p < 0.05), whereas the mean amplitude measures before and after large-scale laryngeal movements did not differ (p > 0.05). Inflammatory responses and hematoma formation were also similar.
Waveform morphology of electromyographic signals registered from both electrode types show similar complex action potentials. There is no difference between the hooked-wire electrode and the concentric needle electrode in terms of electrode stability or vocal fold injury in the thyroarytenoid muscle after large-scale laryngeal movements.
喉肌电图中特定电极类型的使用尚未标准化。喉肌电图通常使用钩丝电极或同心针电极进行。钩丝电极的优点是能使喉部轻松舒适地移动，而同心针电极在技术方面有优势，在尝试正确放置电极时可推进、撤回或重新定位。
本研究探讨在喉部和周围结构进行大规模运动前后，钩丝电极在静息状态下是否比标准同心针电极能获得更稳定的记录。还通过评估声带对两种电极类型放置和移除所导致的组织损伤进行组织学比较。
将电极经皮插入10只成年犬的甲杓肌。在喉部大规模运动前后进行迷走神经刺激时，测量并比较肌电活动的幅度。检查信号随时间的一致性。处死动物后，对声带损伤进行分级并进行组织学比较。
不同电极类型之间的波形形态并无一致差异。钩丝电极的肌电幅度变异性更大（p < 0.05），而喉部大规模运动前后的平均幅度测量值并无差异（p > 0.05）。炎症反应和血肿形成也相似。
两种电极类型记录的肌电信号波形形态显示出相似的复合动作电位。在喉部大规模运动后，钩丝电极与同心针电极在电极稳定性或甲杓肌声带损伤方面并无差异。
