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Epilepsy surgery is effective in 30–85% of patients with drug-resistant epilepsy. However, risk factors associated with favorable and unfavorable outcomes of epilepsy surgery need to be further evaluated. We present the outcome of the large epilepsy surgery cohort in Russian Federation.Purpose: evaluation of risk factors of favorable and unfavorable long-term outcomes in the Russian cohort of drugresistant patients with epilepsy.Material and methods. Three hundred and eight patients with structural drug-resistant epilepsy were operated by the neurosurgery team of Moscow State University of Medicine and Dentistry. Presurgical investigations and surgeries were performed by this team between 01.01.2014 and 31.12.2020. All patients underwent neurological and neuropsychological evaluation, seizure semiology assessment, neuroimaging and neurophysiological examination. Histological analysis of resected tissues was performed. Results of surgery were assessed according to J. Engel (1993) at 6, 12, 24, 48 and 60 months after surgery. Risk factors, associated with favorable (Engel I–II) and unfavorable (Engel III–IV) outcomes were evaluated.Results. Underwent 308 primary resection procedures, placement of a vagus nerve stimulator were in 41 patients, 9 patients have been repeated by resection procedures and 8 — underwent radiosurgical treatment. 256 (83%) patients were MR-positive, 53 (17%) — MR-negative. Temporal lesions were revealed in 186 (60%) patients, extratemporal — in 8 (3%), bilateral temporal — in 15 (5%), combination of temporal and extra-temporal — in 81 (26%), multifocal — in 16 (5%), generalized form in 2 (1%). In 12 months after surgery there were favorable outcomes (Engel I + II) in 85% of patients (n = 148), in 24 months — 70% (n = 127). In patients with MRI positive and negative lesions the result of surgery after 12 months was comparable. Postoperative complications were diagnosed in 6 (1.9%) patients, there were no mortality. Temporal plus epilepsy (p = 0.009), multifocal (p = 0.008) and bilateral lesions (p = 0.006) were the most significant risk factors of unfavorable surgery outcomes.Conclusion. The presented results confirm the efficiency of surgical treatment of drug-resistant epilepsy. Temporal plus form epilepsy, multifocal and bilateral lesions were the most significant risk factors of unfavorable surgery outcomes.
Epilepsy surgery is effective in 30–85% of patients with drug-resistant epilepsy. However, risk factors associated with favorable and unfavorable outcomes of epilepsy surgery need to be further evaluated. We present the outcome of the large epilepsy surgery cohort in Russian Federation.Purpose: evaluation of risk factors of favorable and unfavorable long-term outcomes in the Russian cohort of drugresistant patients with epilepsy.Material and methods. Three hundred and eight patients with structural drug-resistant epilepsy were operated by the neurosurgery team of Moscow State University of Medicine and Dentistry. Presurgical investigations and surgeries were performed by this team between 01.01.2014 and 31.12.2020. All patients underwent neurological and neuropsychological evaluation, seizure semiology assessment, neuroimaging and neurophysiological examination. Histological analysis of resected tissues was performed. Results of surgery were assessed according to J. Engel (1993) at 6, 12, 24, 48 and 60 months after surgery. Risk factors, associated with favorable (Engel I–II) and unfavorable (Engel III–IV) outcomes were evaluated.Results. Underwent 308 primary resection procedures, placement of a vagus nerve stimulator were in 41 patients, 9 patients have been repeated by resection procedures and 8 — underwent radiosurgical treatment. 256 (83%) patients were MR-positive, 53 (17%) — MR-negative. Temporal lesions were revealed in 186 (60%) patients, extratemporal — in 8 (3%), bilateral temporal — in 15 (5%), combination of temporal and extra-temporal — in 81 (26%), multifocal — in 16 (5%), generalized form in 2 (1%). In 12 months after surgery there were favorable outcomes (Engel I + II) in 85% of patients (n = 148), in 24 months — 70% (n = 127). In patients with MRI positive and negative lesions the result of surgery after 12 months was comparable. Postoperative complications were diagnosed in 6 (1.9%) patients, there were no mortality. Temporal plus epilepsy (p = 0.009), multifocal (p = 0.008) and bilateral lesions (p = 0.006) were the most significant risk factors of unfavorable surgery outcomes.Conclusion. The presented results confirm the efficiency of surgical treatment of drug-resistant epilepsy. Temporal plus form epilepsy, multifocal and bilateral lesions were the most significant risk factors of unfavorable surgery outcomes.
Introduction. In patients with drug-resistant temporal lobe epilepsy (TLE), surgical treatment is aimed to resect an epileptogenic zone (EZ) followed by seizure control. Despite complicated EZ location, surgical resection should be considered as a treatment of choice in bilateral TLE. Objective: to evaluate surgical outcomes and factors contributing to outcomes in patients with drug-resistant bilateral TLE confirmed via magnetic resonance imaging. Materials and methods. The study included patients with unilateral (n = 50) and bilateral (n = 50) temporal lobe involvement. The results of surgical treatment were evaluated according to the classification of J. Engel (1993). Results. Favorable outcomes of surgical treatment (Engel I and Engel II) in the group with unilateral temporal lobe involvement were found in 98% of patients after 12 months, in 88% after 24 months, and in 100% after 48 and 60 months after surgery. In the group with bilateral temporal lobe involvement outcomes of surgical treatment were favorable in 41% of patients after 12 months, in 50% after 24 months, in 39% after 48 months, and in 50% of patients after 60 months post-surgery. Conclusion. Early onset, burdened perinatal history, and MRI-confirmed left temporal lobe involvement contribute to the poor outcome (Engel III and Engel IV) in the bilateral TLE group. Engel I outcomes were more common in the patients with unilateral TLE while Engel IIIV outcomes were more common in the patients with bilateral TLE.
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