QINJiaming 1 , NIGuanzhong 1 , FANGZiyan 2 , CHENShuda 3 , CAIXiaodong 4 , ZHOULiemin 1
  • 1. Department of Neurology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China;
  • 2. Department of Neurology, Guangzhou brain hospital, Guangzhou 510000, China;
  • 3. Department of Neurology, Guangzhou No.1 People's Hospital, Guangzhou 510000, China;
  • 4. Department of Neurology, Epilepsy Center, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou 510000, China;
ZHOULiemin, Email: lmzhou56@163.com
Epilepsy; Withdrawal; Relapse; Hippocampal sclerosis
10.7507/2096-0247.20160036
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Objective To determine the outcome of antiepileptic drugs (AEDs) withdrawal in patients who had been seizure-free for more than two years. Methods Patients with epilepsy who had been seizure-free for at least two years and decided to stop AEDs therapy gradually were checked on every two months for seizure relapse. The inclusion criteria were:①diagnosis of epilepsy, defined as at least two unprovoked seizures at least 24 hours apart; ②patients remained seizure-free for at least 24 consecutive months during AEDs therapy; ③patients expressed a desire to discontinue AEDs therapy gradually and agreed to return for regular follow-ups; and④electroencephalogram (EEG) showed no epileptic discharge. The time to a seizure relapse and predictive factors were analyzed by survival methods, including sex; age at seizure onset; number of episodes; seizure-free period before AEDs withdrawal; duration of follow-up after AEDs withdrawal; AEDs tapering off period (taper period); results from brain MRI; EEG before seizure-free; EEG before drug withdrawal; seizure type (classified as generalized, partial, or multiple types based on history); the number of AEDs administered for long-term seizure control. A log-rank test was used for univariate analysis, and a Cox proportional hazard model was used for multivariate analysis. Results Sixty-eight patients (39 male, 29 female) were admithed. The relapsed rate was 23.5%. Univariate analysis and multivariate Cox regression analysis indicated that multiple AEDs, hippocampal sclerosis and withdrawal time were significantly correlated with seizure recurrence and those were significant independent predictive factors, with hazard ratio were 0.861, 2.223 and 2.137 respectively. Conclusions The relapsed rate in our study was similar to other studies. Distinguishing variables, such as multiple AEDs, hippocampal sclerosis and withdrawal time, need to be considered when decide to withdraw. Therefore, our recommendation is that after two years of being seizure-free, patients could consider withdrawal unless they are hippocampal sclerosis patients.

Citation： QINJiaming, NIGuanzhong, FANGZiyan, CHENShuda, CAIXiaodong, ZHOULiemin. Risks of seizure recurrence from antiepileptic drug withdrawal among seizure-free patients for more than three years. Journal of Epilepsy, 2016, 2(3): 193-198. doi: 10.7507/2096-0247.20160036 Copy

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