Long-Range Video Electroencephalographic Characteristics And Clinical Analysis Of Occipital Lobe Epilepsy

Purpose:The present study is to investigate the characteristics of long-range video electroencephalogram(V-EEG)and clinical features in occipital lobe epilepsy(OLE),in order to summary the clinical semiology and the specific manifestation of EEG.Methods:We retrospectively collected 36 patients with OLE who had received long-range V-EEG monitoring in our epilepsy center.We analyzed clinical symptoms and the characteristics of V-EEG.Results:Twenty nine cases(80.56%)had visual auras based on previous history,6 cases(35.29%)had visual auras during monitoring.V-EEG showed interictal epileptic discharges in 35 patients during the interictal episode,of which 24 were both awake and asleep,10 were only found during sleeping,and 1 were only found during awake state,the detection rate of epileptiform discharge is 97.22%.A total of 72 clinical seizures were recorded when the V-EEG monitoring,including 45 times during awake state and 27 times during sleeping.Interictal epileptiform discharges occurred in 29 cases of stageⅠ NREM,34 cases of stage Ⅱ,8 cases of stage Ⅲ and 3 cases of stage Ⅳ.Four cases had the interictal epileptic discharges confined to the occipital lobe,2 cases had the posterior temporal area discharges,while 29 cases had epileptic discharge involved more than one lobe of the brain;In ictal phase,12 cases had clear discharge origin or the earliest evolution in occipital lobe.The rest of 5 cases showed abnormal EEG in the other brain areas,which need other clinical information for diagnosing the OLE.Conclusion:The visual symptoms were typical characteristics of OLE.The interictal and ictal EEG of OLE had specific characteristics.The wakefulness and sleep EEG were also different.To master the EEG characteristics and symptomatology was helpful for the analysis and diagnosis of OLE.