| Objective: To exam the patient with vertebrobasilar insufficient (VBI) by using brainstem auditory evoked potential (BAEP), compare with the control group and observe its BAEP abnormal situation, then discuss BAEP diagnostic value on VBI from the electricity physiology angle.Material and method: There were 60 patients with VBI, 36 males and 24 females. The age was from 45 to 65 and the average age was 52.5. The clinic diagnostic standard referred to the domestic correlation research standard and the American state-run health research institute standard formulated in 1990. The healthy comparison group has 30 cases, 18 males and 12 females. The age was from 45 to 66 and the average age was 53.5. They all didn't have the nervous, the spirited and the ear source disease. It had no evident difference between the two groups in sex and age. The apparatus we used was the Keypoint evoked-electromyography that was made in Denmark. The person lie down evenly and at the peacefully relaxes condition. Set the record electrode to two sides earlobes (A1, A2), the reference electrode will set to center top of the head (CZ), the grounding will meet with the wrist, the interelectrode resistance is smaller than 5 kilohms. Stimulate one ear with short sound and conceal the other with the white noise. The intensity of stimulation uses sense pole, band pass 100 - 3000Hz, stimulate frequency 11.1 Hz, the signal superimposes 2,000 times, analysis time 10ms, separately inspects to guarantee its accuracy do it again .Tests I, III, V wave PL and IPL of the wave ridge between I - III, III– V and I - V and the wave amplitude of the I, V wave. The normal values standard referring to the electricpotential/myo-electricity chart room which is in the first clinicalinstitute of Beijing medical college. The contrast between the two groups was examined by the X2 text.Results:1. There were 60 people in the VBI group, the abnormal people were 42 and the abnormality rate was 70%. The control group has 30 people and the abnormal people were 6, the abnormality rate was 20%. The difference between the two groups has the prominent significance. (X2 = 20.09, P < 0.01).2. The abnormal comparison between I—III and III—V IPL: in the VBI group there were 42 BAEP masculine patients, 12 were I—III IPL abnormality and 36 were III—V IPL abnormality. I—III IPL was much more evidence. X2 = 28, (P < 0.01). The comparison between them has the prominent significance3. In the VBI group there were 42 BAEP masculine patients who have the clinical symptom improvement after inspected and the BAEP inspection, 24 patients were still abnormal, accounted for 57.14%.4. Patients of BAEP positive, 5 persons, V wave amplitude were extremely low or vanishes, 3 persons were discovered freshly blocks sickness stove at the brainstem by carrying on head nuclear magnetic resonance inspection.Conclusions:1. Brainstem auditory evoked potential has the important diagnosis value to vertebrobasilar insufficient.2. We can't simply determine whether the VBI patient changes for the better by the BAEP result, we'd better consider comprehensively combine the clinical.3. V wave is abnormal, especially V wave amplitude extremely low or vanish, possibly suggest that the cerebral infarction at the brainstem. |
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