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Relative Seizure Relapse Risks Associated with Antiepileptic Drug Withdrawal After Different Seizure-Free Periods in Adults with Focal Epilepsy: A Prospective, Controlled Follow-Up Study.
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- Author(s): Wang, Xinshi (AUTHOR); He, Ruqian (AUTHOR); Zheng, Rongyuan (AUTHOR); Ding, Siqi (AUTHOR); Wang, Yi (AUTHOR); Li, Xueying (AUTHOR); Hua, Yingjie (AUTHOR); Zeng, Qingyi (AUTHOR); Xia, Niange (AUTHOR); Zhu, Zhenguo (AUTHOR); Kwan, Patrick (AUTHOR); Xu, Huiqin (AUTHOR)
- Source:
CNS Drugs. Nov2019, Vol. 33 Issue 11, p1121-1132. 12p. - Source:
- Additional Information
- Subject Terms: PARTIAL epilepsy; PHENOBARBITAL; SEIZURES (Medicine); ANTICONVULSANTS; PROPORTIONAL hazards models; DRUG therapy for convulsions; COMPARATIVE studies; DRUG withdrawal symptoms; EPILEPSY; LONGITUDINAL method; RESEARCH methodology; MEDICAL cooperation; RESEARCH; RISK assessment; SPASMS; TIME; DISEASE relapse; EVALUATION research
- Abstract:
Background: Approximately two-thirds of patients with newly diagnosed epilepsy become seizure-free after antiepileptic drug (AED) treatment. A crucial issue for these patients and their families, especially after a long period of seizure freedom, is when to stop their medications.Objective: The aim of this study was to identify the optimal timing of AED withdrawal in adults with focal epilepsy who had been seizure-free for ≥ 2 years.Methods: Adults with focal epilepsy who had been seizure-free for ≥ 2 years were recruited. Based on their decision to discontinue (withdrawal) or continue (non-withdrawal) AED treatment, patients were assigned to withdrawal or non-withdrawal subgroups according to the length of remission (2 to < 3 years, 3 to < 4 years, 4 to < 5 years and ≥ 5 years). The relapse risks of the withdrawal and corresponding non-withdrawal subgroups were compared, and the relative relapse risks were assessed in a Cox proportional hazard regression model.Results: A total of 213 eligible patients began to withdraw from AED treatment; 70 had been seizure-free for 2 to < 3 years, 62 had been seizure-free for 3 to < 4 years, 37 had been seizure-free for 4 to < 5 years and 44 had been seizure-free for ≥ 5 years. The figures for the corresponding non-withdrawal subgroups were 463, 334, 251 and 182, respectively. There was a significantly higher risk of seizure relapse in patients withdrawing from AEDs after 2 to < 5 years of seizure freedom than in the corresponding non-withdrawal controls, and the relative relapse risk was 3.052 (95% confidence interval [CI] 2.126-4.381; p < 0.001) for the seizure-free period of 2 to < 3 years, 3.617 (95% CI 2.384-5.488; p < 0.001) for 3 to < 4 years and 2.644 (95% CI 1.456-4.799; p = 0.001) for 4 to < 5 years. However, for patients who were seizure-free for ≥ 5 years, AED withdrawal did not significantly increase the risk of seizure relapse compared with that of patients continuing treatment (hazard ratio [HR] 1.362, 95% CI 0.634-2.926, p = 0.428). Compared with a seizure-free period of 2 to < 3 years, the relative relapse risk after AED withdrawal was significantly reduced only after being seizure-free for ≥ 5 years (HR 0.441, 95% CI 0.233-0.834; p = 0.012).Conclusion: Overall, for adults with focal epilepsy, withdrawal from AEDs significantly increased the risk of seizure relapse after being seizure-free for 2 to < 5 years, but might not increase the risk if the seizure-free period was ≥ 5 years. [ABSTRACT FROM AUTHOR] - Abstract: Copyright of CNS Drugs is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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