[Electromyographic analysis of the role of the otolith apparatus in regulation of postural disorders in humans with extrapyramidal pathology].

In 30 patients with cervical dystonia in the posture of orthostasis, an obvious change of the electromyographic pattern was shown both at rest and in different functional tests. The analysis has shown an enhanced excitability of motoneurons and a disorder of the cortical control, as well as enhancement of the irradiation process between paired structures controlling activity of opposite muscular groups. After treatment with intratympanal administration of an ototoxical preparation on the opposite side in respect to head turn direction, normalising of the cortical control and diminishing of the excitation irradiation. The data obtained suggest a significant role of the vestibular otolithic apparatus in regulation of postural disorders in extrapyramidal pathology.