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Prediction of seizure freedom after epilepsy surgery – critical reappraisal of significance of intracranial EEG parameters
Clinical Neurophysiology ( IF 4.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.clinph.2020.08.018
David Steinbart , Mirja Steinbrenner , Frank Oltmanns , Martin Holtkamp

OBJECTIVE To analyze the significance of intracranial electroencephalography (iEEG) parameters such as seizure onset patterns (SOP) and size of seizure onset zone (SOZ) with respect to prediction of seizure freedom after resective epilepsy surgery. METHODS All patients who underwent iEEG with subdural electrodes between January 2006 and December 2015 in our epilepsy-center were included. Various iEEG parameters were retrospectively analyzed regarding their predictive value to post-operative seizure freedom. Furthermore, associations of specific SOPs with underlying histopathology and brain regions of the SOZ were examined. RESULTS Eighty-one patients (34 female) with 324 seizures were assessed. Low-voltage fast activity (37%) and sharp activity <13 Hz (30%) were the most frequent SOPs. Focal SOZ (≤2 cm) was the only iEEG parameter independently associated with 1-year post-operative seizure freedom (OR 4.1, 95% CI 1.433-11.679). While no SOP was linked to specific histopathologies, some associations between SOPs and anatomical regions of SOZ were found. CONCLUSIONS A circumscribed SOZ, but no specific SOP was predictive for seizure freedom after epilepsy surgery. SIGNIFICANCE Intracranial EEG may be helpful to predict post-operative seizure freedom. Multicenter studies with larger numbers of patients are required to reliably assess the significance of specific SOPs for successful resective epilepsy surgery.

中文翻译:

癫痫手术后无癫痫发作的预测——对颅内 EEG 参数重要性的重新评估

目的 分析颅内脑电图 (iEEG) 参数,如癫痫发作模式 (SOP) 和癫痫发作区的大小 (SOZ) 对预测切除性癫痫手术后癫痫发作自由的意义。方法 纳入 2006 年 1 月至 2015 年 12 月在我们癫痫中心接受硬膜下电极 iEEG 的所有患者。回顾性分析了各种 iEEG 参数对术后癫痫发作自由的预测价值。此外,还检查了特定 SOP 与潜在组织病理学和 SOZ 大脑区域的关联。结果 评估了 81 名患者(34 名女性)的 324 次癫痫发作。低电压快速活动 (37%) 和尖锐活动 <13 Hz (30%) 是最常见的 SOP。局灶性 SOZ(≤2 cm)是唯一与术后 1 年无癫痫发作独立相关的 iEEG 参数(OR 4.1,95% CI 1.433-11.679)。虽然没有 SOP 与特定的组织病理学相关联,但发现了 SOP 与 SOZ 解剖区域之间的一些关联。结论 限制性 SOZ 但没有特定 SOP 可预测癫痫手术后无癫痫发作。意义 颅内 EEG 可能有助于预测术后无癫痫发作。需要对大量患者进行多中心研究,以可靠地评估特定 SOP 对成功切除性癫痫手术的重要性。结论 限制性 SOZ 但没有特定 SOP 可预测癫痫手术后无癫痫发作。意义 颅内 EEG 可能有助于预测术后无癫痫发作。需要对大量患者进行多中心研究,以可靠地评估特定 SOP 对成功切除性癫痫手术的重要性。结论 限制性 SOZ 但没有特定 SOP 可预测癫痫手术后无癫痫发作。意义 颅内 EEG 可能有助于预测术后无癫痫发作。需要对大量患者进行多中心研究,以可靠地评估特定 SOP 对成功切除性癫痫手术的重要性。
更新日期:2020-11-01
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