Humbert Ianessa A, Poletto Christopher J, Saxon Keith G, Kearney Pamela R, Ludlow Christy L
Laryngeal and Speech Section, National Institute of Neurological Disorders and Stroke/NIH, 10 Center Drive, Bethesda, MD 20892, USA.
Laryngoscope. 2008 Jan;118(1):14-9. doi: 10.1097/MLG.0b013e318155a47d.
OBJECTIVES/HYPOTHESIS: Closure of the true and false vocal folds is a normal part of airway protection during swallowing. Individuals with reduced or delayed true vocal fold closure can be at risk for aspiration and may benefit from intervention to ameliorate the problem. Surface electrical stimulation is currently used during therapy for dysphagia, despite limited knowledge of its physiological effects.
Prospective single effects study.
The immediate physiological effect of surface stimulation on true vocal fold angle was examined at rest in 27 healthy adults using 10 different electrode placements on the submental and neck regions. Fiberoptic nasolaryngoscopic recordings during passive inspiration were used to measure change in true vocal fold angle with stimulation.
Vocal fold angles changed only to a small extent during two electrode placements (P < or = .05). When two sets of electrodes were placed vertically on the neck, the mean true vocal fold abduction was 2.4 degrees; while horizontal placements of electrodes in the submental region produced a mean adduction of 2.8 degrees (P = .03).
Surface electrical stimulation to the submental and neck regions does not produce immediate true vocal fold adduction adequate for airway protection during swallowing, and one position may produce a slight increase in true vocal fold opening.
目的/假设：真性和假性声带闭合是吞咽过程中气道保护的正常组成部分。真性声带闭合减弱或延迟的个体有发生误吸的风险，可能会从改善该问题的干预措施中获益。尽管对其生理效应了解有限，但表面电刺激目前仍用于吞咽困难的治疗。
前瞻性单效应研究。
在27名健康成年人休息时，使用颏下和颈部区域的10种不同电极放置方式，检查表面刺激对真性声带角度的即时生理效应。在被动吸气期间，使用纤维鼻咽喉镜记录来测量刺激时真性声带角度的变化。
在两种电极放置方式下，声带角度仅发生了小程度的变化（P≤0.05）。当两组电极垂直放置在颈部时，真性声带平均外展2.4度；而电极水平放置在颏下区域时，平均内收2.8度（P = 0.03）。
对颏下和颈部区域进行表面电刺激并不能立即产生足以在吞咽时保护气道的真性声带内收，且一种放置方式可能会使真性声带开口略有增加。
