EMG-Biofeedback Training of Traumatic Strabismus (Palsy of VI Nerve)

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  • 外傷性斜視(外直筋痳痺)に対する筋電図バイオフィードバック・トレーニングの試み

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Abstract

EMG-Biofeedback training (EMG-BFT) was applied to a college student who suffered from sequellae of cheek bone fracture due to bicycle accident for 2 years. He was diagnosed abducens palsy (VI) and facial palsy (VII) with symptoms of traumatic divergent strabisums, secondary spasmodic torticollis, loss of wrinkle on L-forehead, imbalance of nasal groove, slight degree of speech dysfunction and walk disturbance. He could not walk straight. Five sessions of EMG-BFT in one month showed that he could move left eyeball outward and as a consequence he became free from strabismus and secondary torticollis, and could wrinkle his forehead al-most even with right-left balance. However, his wrinkle was shallower in the left after 6 months when he finished EMG-BFT. With regard to therapeutic mechanism why EMG-BFT of facial nerve (VII) worked on obducens palsy, Tasaki & Saito's text book revealed that both nuclei was located adjacent in the pons and VII nerve goes round VI nucleus. According to textbook (SOBOTA/BECHER eds.), VII nerve fiber reach to VI nucleus directly. So biofeedback information of both forehead and ocular orbital muscle (VII) might contribute abducens muscle (VI) through adjacent effect. In the kingdom of ophthalmology, EOG(electrooculography) and PEOG (Photoelectrooculography) is undertrial for biofeedback training of strabismus too. Clinical application of self-control technique is expected in near future.

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