Analysis Of Electrophysiology In Patients With Posterior Circulation TIA

Objective:Transient ischemic attack of posterior circulation ischemia is posterior circulation ischemia common type, the clinical attack is short, the symptoms are transient, in clinical practice of the posterior circulation TIA correct understanding and mastering of the necessary auxiliary examinations is particularly important. This paper discusses the brainstem auditory evoked potential (BAEP), Blink reflex (BR), trigemino-cervical reflex (TCR) for transient ischemic attack of posterior circulation ischemia patients the diagnostic value of brain dysfunction.Methods:The group of the posterior circulation transient ischemic attack (TIA group) patients in all the cases of 50 cases, clinical mainly for short, reversible, repeated acute onset of cerebellum, brainstem, occipital lobe and the hippocampus function defect, every time duration of disease in a few minutes until a usually hours, the symptoms and signs in 24 hours, has not fully recovered from the nervous system function defect symptoms, head MRI DWI sequences show no infarcts, do BAEP, BR, TCR examine, observe BAEPⅠ,Ⅲ,Ⅴwave potential latency (PL) inter potential latency (IPL), calculation blink reflex R1, R2 and R2 'all ingredients in average the potential latency, TCR P19/N31 wave potential latency,40 patients and those with health as a control.Results:1.BAEP abnormal 36 cases of TIA (72 percent), including left abnormal 12 cases, right abnormal 14 cases, and 10 cases of bilateral abnormal.20 cases of performance forⅠwave normally,Ⅲ,Ⅴwave PL extended or wave pattern, poorly differentiated,Ⅰ-Ⅲwave of IPL extend are 11 cases (3 cases were bilateral extended),Ⅲ-Ⅴwave IPL extended andⅢ-Ⅴ/Ⅰ-Ⅲ> 1 are 6 cases (1 case was bilateral extended),Ⅰ-Ⅴwave IPL extend are 3 cases(1 case was bilateral extended); 12 cases of all of theⅠ,Ⅲ,Ⅴwave PL extended,Ⅰ-Ⅲwave of IPL extend are 6 cases (2 cases were bilateral extended),Ⅲ-Ⅴwave IPL extended andⅢ-Ⅴ/Ⅰ-Ⅲ> 1 are 3cases (1 case was bilateral extended),Ⅰ-Ⅴwave IPL extend are 3 cases;4 cases onlyⅠwave PL extended (2 cases were bilateral extended),Ⅰ-ⅢaffectedⅢ-Ⅴwave not seen IPL apparently unusual.2.TIA group BR abnormal 38 cases (76%),12 cases of R1 abnormal (one side abnormal 8 cases, bilateral abnormal 4 cases),16 cases of R2,R2' abnormal(one side abnormal 6 cases, bilateral abnormal 10 cases), one side or both sides R1 with one side or bilateral R2, R2'abnormal 10 cases.3. TIA group TCR abnormal 15 cases (30%), Performance for bilateral PL asymmetric are10 cases, bilateral P19/N31 wave PL extends are 5 cases.4. Group of 50 cases TIA, TIA group BAEP, BR and TCR united examine are 41 cases (82%) abnormal.Conclusion:1.BAEP each wave with vertebrobasilar arterial system sources blood-supply area are identical with each other。This study found that all kinds of abnormal index distributionⅢwave andⅠ-Ⅲwave IPL highest. It can sensitive to reflect the degree of brain ischemia and brainstem neural stem nuclei blood perfusion status changes, it can early from electrical physiology function of reflect brainstem auditory pathways abnormal.2. This study BR abnormal rate is the highest (76%). Because BR check may be affected by the status of patients with hearing brainstem functions reflect, it has application advantages than BAEP.3. For patients with posterior circulation TIA of TCR testing, appear abnormal and asymmetric the incubation period, it can be used as understanding the medulla oblongata function under section carried a simple method.4. BAEP, BR, TCR 3 checks are different, and have internal relations. Three of the brainstem responses are different degree of function structure of cross overlap. Three united inspection abnormal rate up 82%, patients often have two or more check abnormalities, Explain the mutual supplement each other, more likely to complement each other, combined application abnormal.5.The electrophysiological examination is noninvasive, with the characteristics of simple, economy, as functional check, can be made earlier imaging examination, and can be used as abnormal condition monitoring, dynamic observation the objective index.