摘要
目的观察健康人强短声诱发的短潜伏期咬肌肌源性电位,并确定其起源。方法21名健康志愿者,给予单侧或双侧强短声刺激(0.1ms、5Hz、70～100dB),在稳定收缩的双侧咬肌表面,记录咬肌肌源性电位,观察头左右倾斜30°对双侧强短声(100dB)诱发的咬肌肌源性电位的影响,并对强短声在咬肌和在胸锁乳突肌(SCM)上诱发的肌源性电位的刺激阈值进行比较。1名传导性耳聋患者及2名单侧重度感音性耳聋患者也进行强短声诱发的短潜伏期咬肌肌源性电位检测,以初步确定该电位的起源。结果健康人单侧短声刺激可诱发双侧短潜伏期的咬肌肌源性电位,根据其潜伏期、阈值和波形可有3种反应模式:在低阈值时为p16/n21,在高强度刺激时表现为p11/n15或p11/n21波。p11幅度受头左右30°倾斜的不对称性调制。咬肌p11波的阈值和短声在SCM上诱发的p13/n23波的阈值相同。传导性耳聋患者强短声刺激不能诱发出咬肌p11电位,而重度感音性耳聋患者单侧或双侧强短声刺激均可诱发出双侧咬肌p11肌源性电位。结论强短声可以诱发双侧咬肌p11肌源性电位,该肌源性电位可能源于前庭,特别是球囊。三叉神经运动系统受到前庭刺激的影响。
Objective To investigate loud click-evoked short latency masseter myogenic potentials in healthy humans and determine the origin of the masseter myogenic potentials. Methods Twenty one healthy volunteers served as subjects. Unilateral or bilateral clicks（0.1 ms, 5 Hz, 70- 100 dB）,delivered during a steady masseter contraction, evoked potentials of bilateral masseters were recording. Effect of 30° tilt of the head on loud click-evoked masseter myogenic potentials were also observed. The threshold of short latency responses in masster were compared with the threshold of click-induced p13/n23 response in sternocleidomastoid muscles（SCM）. Furthermore loud click-evoked masseter myogenic potentials were observed on one conductive hearing loss patient and two severe unilateral sensory neural hearing loss patients in order to determine preliminarily the origin of the masseter myogenic potentials. Results Unilateral click evoked bilateral masseter responses that appeared to consist of 3 components on the basis of threshold,latency, and their wave form in masseter potentials. The lowest threshold response appeared as a p16/n21 wave and higher-intensity clicks recruited an early pll response which displayed pll/n15 or pll/n21 wave in masseter potentials. The amplitude of the pll wave was asymmetrically modulated by 30° tilt of the head. The threshold of the early pll wave in masseter was the same as the threshold for click-induced vestibular-evoked myogenic potentials responses in SCM. Masseter myogenic potentials were not evoked by suffering ipsilateral loud click in a conductive hearing loss patient but were evoked by unilateral or bilateral loud click in two sensory neural hearing loss patients. Conclusions Loud clicks can evoked bilateral pll short-latency myogenic potential in masseter muscle, which is of vestibular origin, saccule especially. Vestibular stimulation has influence on trigeminal motor system.
出处
《中华航空航天医学杂志》
CSCD
2006年第4期285-291,共7页
Chinese Journal of Aerospace Medicine
关键词
声刺激
前庭
诱发电位
听觉
脑干
咬肌
三叉神经
肌电描记术
Acoustic stimulation
Vestibular
Evoked potentials, auditory, brain stem
Masseter
Trigeminal
Electromyography
