Application Of Somatosensory Evoked Potential In Function Assessment Of Patients With Lumber Disc Herniation

ObjectiveThe purpose of this article is to use dermatomal somatosensory evoked potentialtechnique in patients with lumbar disc herniation, according to dermatomalsomatosensory evoked potentials graphics and related indicators in patients to Judgelower extremity sensory function to guide clinical diagnosis, treatment methods todetermine.MethodsBefore the experiment, Tell the patient the actual situation, Select64lumbar discherniation patients with lower limb illness and have typical clinical symptoms andsigns after CT and (or) MRI examination, Grouped according to the situation of lowerextremity sensory nerve function, To whether there is numbness, pain into group (A)and numbness (group B). Which is pure pain group only unilateral sciatica and lowback pain, contralateral limb is no abnormal, No numbness of both Lower limb;Standard of numb group is only have Numbness on one foot, may have lower limbpain and sciatica, etc. while. two groups of patients were collected the bilateral limbsfeeling evoked potentials, Detection of method: Using electrophysiological testinginstrument, Patient take supine get the result under calm、emotionally stable、comfortable ambient temperature conditions, stimulus intensity was2.5times sensorythreshold to toe slight twitch as the standard. L5dermatome stimulation points on theinside of the first metatarsophalangeal joint and S1dermatome outside in the fifthmetatarsophalangeal joint. Both Lower limbs should examined, Recording electrodeplaced on the head Cz′point, Reference electrode placed on Fz point, Signalsuperimposed300-500times, Record changes of the peak latency measurement of P40.Computer print the results automatically. select P40peak latency change as criteria ofthe result. ResultsAfter testing both lower limbs P40latency change of the all patients, Take thecontralateral lower limb P40latency of mean and standard deviation of normalreference values, Ipsilateral P40latency than normal reference values2.5standarddeviation as abnormal, two groups of patients rates were91.7％、92.8％, two groupsP40peak latency decreased compared with the contralateral(P<0.05)，Between the twogroups: the two groups of patients with contralateral P40peak latency was nosignificant difference (P>0.05), group B ipsilateral P40peak latency and both sides ofthe difference between the values were lower than group A (P<0.05).ConclusionSomatosensory evoked potentials in the two groups of patients testing positiverates are higher, Consistent with the clinical symptoms, signs and CT、MRI or otherimaging results. There is a good correlation, Can be used as basis of the diagnosis oflumbar disc herniation, and Supplement and make up for deficiencies and defects ofradiographic examination, Statistically significant between pain and numbness group，Thus somatosensory evoked potentials can distinguish between pain and numbness, todetermine the lower extremity nerve function，and have important reference value ofthe treatment choice and prognosis provided. Overall, somatosensory evoked potentialcan be used as a non-invasive tool detect of lumbar disc herniation and Assess oflower extremity sensory neurological function.