Ea To Improve Due To Vestibular Dysfunction, The Experimental Study Of Cervical Vertigo

Objective To investigate the mechanism of the electroacupuncture which is used to treat the cervicogenic vertigo caused by vertebro-arteiial cervical spondylosis by improving the vestibular dysfunction with the methods of the nystagmus elicited; audiometry and direct vestibular evoked potentials (VsEPs).Methods The rabbits in the model group and electroacupuncture group were injected tissue sclerosing remedy-775 injection into the soft tissue on the left side of cervical vertebral transverse processes to set up the chronic vertebrobasilar insufficiency(VBI) models of the vertebro-arterial cervical spondylosis (VCS) achieved by the stenosis in the left vertebral arteries and the lower blood flow in the basilar and bilateral vertebral arteries.The rabbits were injected Ns as the contrast group. Electroacupuncture of points at both sides of "Fengchi(GB20)" "Tinggong(SI19)" and"Waiguan(SJ5)" were administered to the rabbits in the electroacupuncture group .The animals allowed to be measured the duration of nystagmus by the caloric test -infusing 20 ℃ wiariito the external ear canal, the auditory brainstem response (ABR) induced by click at low(10Hz) and high (50Hz) stimulating rate ,the electrococheogram evoked by click, and the electro-stimulating vestibular evoked potentials(VsEPs) respectively from the left side of ears . and then the results are compared between electroacupuncture group , model group , and contrast groups. Results: The HI wave peak latency(PL) and the I-III wave interpeak latency(TPL) of ABR at 50Hz high stimulating rate in the model group became longer than those in the contrast group ( P<0.05;P<0.05) , compareing with model group, those in eclectroacupuncture group is shorter obviously (P<0.05 ;P<0.05) and there was no remarkable distinction between those in the electroacupuncture group and in the contrast group (P>0.05) .There was no significant difference of ABR at 10Hz low stimulating rate among three groups (P>0.05).The V3 wave PL, and V1-V3 V1-V3 wave IPL of VsEPs in the model group became longer than those in the contrast group (P<0.01; P<0.01; P<0.05) . The V3 wave PL and the V1-V3 wave IPL in the electroacupuncture group became shorter than those in the model group obviously (P<0.05; P<0.01). There was less difference between VsEPs in the electroacupuncture group and in the contrast group (P>0.05).The -SP/AP ratios of the electrococheogram and the duration of nystagmus in the model group increased and shortened more than those in the constrast group respectively ( P<0.01;P<0.01) ,and decreased and prolonged in the electroacupuncture group individually ( P<0.01; P<0.05 ) , and there was no obvious difference between those in the electroacupuncture group and in the contrast group(P>0.05). Conclusion: The function of the vestibular nerves including the semicircular canals is more severely affected than is the cochlear nerves , The electroacupuncture can improve the neure synapses efficiency of the brainstem and the conduction of the vestibulocochlear nerves path, recover the function of the vestibulocochlear organs, and improve cervical vertigo.