Utility of neuronavigation and neuromonitoring in epilepsy surgery

2008 ◽  
Vol 25 (3) ◽  
pp. E17 ◽  
Author(s):  
Scellig S. D. Stone ◽  
James T. Rutka
Keyword(s):  
Present Article ◽  
Epilepsy Surgery ◽  
Refractory Epilepsy ◽  
Potential Utility ◽  
Technical Challenge ◽  
The Future ◽  
Therapeutic Opportunity ◽  
Medically Refractory Epilepsy

The management of medically refractory epilepsy poses both a valuable therapeutic opportunity and a formidable technical challenge to epilepsy surgeons. Recent decades have produced significant advancements in the capabilities and availability of adjunctive tools in epilepsy surgery. In particular, image-based neuronavigation and electrophysiological neuromonitoring represent versatile and informative modalities that can assist a surgeon in performing safe and effective resections. In the present article the authors discuss these 2 subjects with reference to how they can be applied and what evidence supports their use. As technologies evolve with demonstrated and potential utility, it is important for all clinicians who deal with epilepsy to understand where neuronavigation and neuromonitoring stand in the present and what avenues for improvement exist for the future.

A historical cohort of temporal lobe surgery for medically refractory epilepsy: a systematic review and meta-analysis to guide future nonrandomized controlled trial studies

2020 ◽  
Vol 133 (1) ◽  
pp. 71-78 ◽  
Author(s):  
Anthony T. Lee ◽  
John F. Burke ◽  
Pranathi Chunduru ◽  
Annette M. Molinaro ◽  
Robert Knowlton ◽  
...  
Keyword(s):  
Systematic Review ◽  
Temporal Lobe ◽  
Epilepsy Surgery ◽  
Refractory Epilepsy ◽  
Meta Analysis ◽  
Small Sample ◽  
Seizure Freedom ◽  
Level I ◽  
Study Designs ◽  
Medically Refractory Epilepsy

OBJECTIVERecent trials for temporal lobe epilepsy (TLE) highlight the challenges of investigating surgical outcomes using randomized controlled trials (RCTs). Although several reviews have examined seizure-freedom outcomes from existing data, there is a need for an overall seizure-freedom rate estimated from level I data as investigators consider other methods besides RCTs to study outcomes related to new surgical interventions.METHODSThe authors performed a systematic review and meta-analysis of the 3 RCTs of TLE in adults and report an overall surgical seizure-freedom rate (Engel class I) composed of level I data. An overall seizure-freedom rate was also collected from level II data (prospective cohort studies) for validation. Eligible studies were identified by filtering a published Cochrane meta-analysis of epilepsy surgery for RCTs and prospective studies, and supplemented by searching indexed terms in MEDLINE (January 1, 2012–April 1, 2018). Retrospective studies were excluded to minimize heterogeneity in patient selection and reporting bias. Data extraction was independently reverified and pooled using a fixed-effects model. The primary outcome was overall seizure freedom following surgery. The historical benchmark was applied in a noninferiority study design to compare its power to a single-study cohort.RESULTSThe overall rate of seizure freedom from level I data was 72.4% (55/76 patients, 3 RCTs), which was nearly identical to the overall seizure-freedom rate of 71.7% (1325/1849 patients, 18 studies) from prospective cohorts (z = 0.134, p = 0.89; z-test). Seizure-freedom rates from level I and II studies were consistent over the years of publication (R2< 0.01, p = 0.73). Surgery resulted in markedly improved seizure-free outcomes compared to medical management (RR 10.82, 95% CI 3.93–29.84, p < 0.01; 2 RCTs). Noninferiority study designs in which the historical benchmark was used had significantly higher power at all difference margins compared to using a single cohort alone (p < 0.001, Bonferroni’s multiple comparison test).CONCLUSIONSThe overall rate of seizure freedom for temporal lobe surgery is approximately 70% for medically refractory epilepsy. The small sample size of the RCT cohort underscores the need to move beyond standard RCTs for epilepsy surgery. This historical seizure-freedom rate may serve as a useful benchmark to guide future study designs for new surgical treatments for refractory TLE.

Corpus callosotomy in multistage epilepsy surgery in the pediatric population

2011 ◽  
Vol 7 (2) ◽  
pp. 189-200 ◽  
Author(s):  
Jessica S. Lin ◽  
Sean M. Lew ◽  
Charles J. Marcuccilli ◽  
Wade M. Mueller ◽  
Anne E. Matthews ◽  
...  
Keyword(s):  
Epilepsy Surgery ◽  
Refractory Epilepsy ◽  
Initial Step ◽  
Electrode Placement ◽  
Invasive Monitoring ◽  
Eeg Monitoring ◽  
Corpus Callosotomy ◽  
Epileptiform Discharges ◽  
Select Group ◽  
Medically Refractory Epilepsy

Object The object of this study was to evaluate surgical outcome in a select group of patients with medically refractory epilepsy who had undergone corpus callosotomy combined with bilateral subdural electroencephalography (EEG) electrode placement as the initial step in multistage epilepsy surgery. Methods A retrospective chart review of 18 children (ages 3.5–18 years) with medically refractory symptomatic generalized or localization-related epilepsy was undertaken. A corpus callosotomy with subdural bihemispheric EEG electrode placement was performed as the initial step in multistage epilepsy surgery. All of the patients had tonic and atonic seizures; 6 patients also experienced complex partial seizures. All of the patients had frequent generalized epileptiform discharges as well as multifocal independent epileptiform discharges on surface EEG monitoring. Most of the patients (94%) had either normal (44%) MR imaging studies of the brain or bihemispheric abnormalities (50%). One patient had a suspected unilateral lesion (prominent sylvian fissure). Results Of the 18 patients who underwent corpus callosotomy and placement of subdural strips and grids, 12 progressed to further resection based on localizing data obtained during invasive EEG monitoring. The mean patient age was 10.9 years. The duration of invasive monitoring ranged from 3 to 14 days, and the follow-up ranged from 6 to 70 months (mean 35 months). Six (50%) of the 12 patients who had undergone resection had an excellent outcome (Engel Class I or II). There were no permanent neurological deficits or deaths. Conclusions The addition of invasive monitoring for patients undergoing corpus callosotomy for medically refractory epilepsy may lead to the localization of surgically amenable seizure foci, targeted resections, and improved seizure outcomes in a select group of patients typically believed to be candidates for palliative surgery alone.

scholarly journals Long-term outcomes of resective epilepsy surgery after invasive presurgical evaluation in children with tuberous sclerosis complex and bilateral multiple lesions

2015 ◽  
Vol 15 (1) ◽  
pp. 26-33 ◽  
Author(s):  
Ravindra Arya ◽  
Jeffrey R. Tenney ◽  
Paul S. Horn ◽  
Hansel M. Greiner ◽  
Katherine D. Holland ◽  
...  
Keyword(s):  
Tuberous Sclerosis ◽  
Epilepsy Surgery ◽  
Tuberous Sclerosis Complex ◽  
Refractory Epilepsy ◽  
Full Scale ◽  
Secondary Outcome ◽  
Resective Surgery ◽  
Class 1 ◽  
Medically Refractory Epilepsy

OBJECT Tuberous sclerosis complex (TSC) with medically refractory epilepsy is characterized by multifocal brain abnormalities, traditionally indicating poor surgical candidacy. This single-center, retrospective study appraised seizurerelated, neuropsychological, and other outcomes of resective surgery in TSC patients with medically refractory epilepsy, and analyzed predictors for these outcomes. METHODS Patients with multilesional TSC who underwent epilepsy surgery between 2007 and 2012 were identified from an electronic database. All patients underwent multimodality noninvasive and subsequent invasive evaluation. Seizure outcomes were classified using the International League Against Epilepsy (ILAE) scale. The primary outcome measure was complete seizure remission (ILAE Class 1). Secondary outcome measures included 50% responder rate, change in full-scale IQ, electroencephalography improvement, and reduction in antiepileptic drug (AED) burden. RESULTS A total of 37 patients with TSC underwent resective surgery during the study period. After a mean follow-up of 5.68 ± 3.67 years, 56.8% achieved complete seizure freedom (ILAE Class 1) and 86.5% had ILAE Class 4 outcomes or better. The full-scale IQ on follow-up was significantly higher in patients with ILAE Class 1 outcome (66.70 ± 12.36) compared with those with ILAE Class 2 or worse outcomes (56.00 ± 1.41, p = 0.025). In 62.5% of the patients with ILAE Class 2 or worse outcomes, the number of AEDs were found to be significantly reduced (p = 0.004). CONCLUSIONS This study substantiates the evidence for efficacy of resective epilepsy surgery in patients with bilateral multilesional TSC. More than half of the patients were completely seizure free. Additionally, a high proportion achieved clinically meaningful reduction in seizure burden and the number of AEDs.

A survey of neurologists’ views on epilepsy surgery and medically refractory epilepsy

2008 ◽  
Vol 13 (1) ◽  
pp. 96-101 ◽  
Author(s):  
Andrea S. Hakimi ◽  
Marianna V. Spanaki ◽  
Lori A. Schuh ◽  
Brien J. Smith ◽  
Lonni Schultz
Keyword(s):  
Epilepsy Surgery ◽  
Refractory Epilepsy ◽  
Medically Refractory Epilepsy

Safety of Staged Epilepsy Surgery in Children

Neurosurgery ◽  
2013 ◽  
Vol 74 (2) ◽  
pp. 154-162 ◽  
Author(s):  
Jonathan Roth ◽  
Chad Carlson ◽  
Orrin Devinsky ◽  
David H. Harter ◽  
William S. MacAllister ◽  
...  
Keyword(s):  
Epilepsy Surgery ◽  
Refractory Epilepsy ◽  
Electrode Placement ◽  
Wound Complications ◽  
Neurosurgical Procedures ◽  
Epileptogenic Zone ◽  
Invasive Monitoring ◽  
Depth Electrodes ◽  
Major Complications ◽  
Medically Refractory Epilepsy

Abstract BACKGROUND: Surgical resection of epileptic foci relies on accurate localization of the epileptogenic zone, often achieved by subdural and depth electrodes. Our epilepsy center has treated selected children with poorly localized medically refractory epilepsy with a staged surgical protocol, with at least 1 phase of invasive monitoring for localization and resection of epileptic foci. OBJECTIVE: To evaluate the safety of staged surgical treatments for refractory epilepsy among children. METHODS: Data were retrospectively collected, including surgical details and complications of all patients who underwent invasive monitoring. RESULTS: A total of 161 children underwent 200 admissions including staged procedures (&gt;1 surgery during 1 hospital admission), and 496 total surgeries. Average age at surgery was 7 years (range, 8 months to 16.5 years). A total of 250 surgeries included resections (and invasive monitoring), and 189 involved electrode placement only. The cumulative total number of surgeries per patient ranged from 2 to 10 (average, 3). The average duration of monitoring was 10 days (range, 1–30). There were no deaths. Follow-up ranged from 1 month to 10 years. Major complications included unexpected new permanent mild neurological deficits (2%/admission), central nervous system or bone flap infections (1.5%/admission), intracranial hemorrhage, cerebrospinal fluid leak, and a retained strip (each 0.5%/admission). Minor complications included bone absorption (5%/admission), positive surveillance sub-/epidural cultures in asymptomatic patients (5.5%/admission), noninfectious fever (5%/admission), and wound complications (3%/admission). Thirty complications necessitated additional surgical treatment. CONCLUSION: Staged epilepsy surgery with invasive electrode monitoring is safe in children with poorly localized medically refractory epilepsy. The rate of major complications is low and appears comparable to that associated with other elective neurosurgical procedures.

Evaluation of different antiepileptic drug strategies in medically refractory epilepsy patients following epilepsy surgery

2012 ◽  
Vol 101 (1-2) ◽  
pp. 14-21 ◽  
Author(s):  
Tian-fang Zeng ◽  
Dong-mei An ◽  
Jin-mei Li ◽  
Yao-hua Li ◽  
Lei Chen ◽  
...  
Keyword(s):  
Antiepileptic Drug ◽  
Epilepsy Surgery ◽  
Refractory Epilepsy ◽  
Medically Refractory Epilepsy

scholarly journals Outcome of Surgical Treatment in Medically Refractory Epilepsy

2016 ◽  
Vol 41 (3) ◽  
pp. 121-124 ◽  
Author(s):  
Akhlaqe Hossain Khan ◽  
K. M. Tarikul Islam ◽  
Kanuj Kumar Barman ◽  
Kanak Kanti Barua ◽  
Methew Abraham
Keyword(s):  
Epilepsy Surgery ◽  
Refractory Epilepsy ◽  
Medical Science ◽  
Early Response ◽  
Temporal Lobectomy ◽  
Response To Treatment ◽  
Seizure Outcome ◽  
Sree Chitra Tirunal Institute ◽  
Mesial Temporal Sclerosis ◽  
Medically Refractory Epilepsy

The aim of epilepsy surgery is not only to control seizures but also to curtail future adverse neurological sequelae and improve quality of life. Epilepsy surgery is a viable treatment option for selected cases of medically refractory epilepsy. A study was carried out with a series of 34 cases who underwent epilepsy surgery at Sree Chitra Tirunal Institute for Medical Science & Technology, Kerala, India during July, 2010 to December, 2010. Clinical features, operative procedures and early response to treatment were characterized. Among 34 cases, main clinical manifestation was recurrent seizures. All cases were evaluated by Video Electro Encephalogram (EEG) & Magnetic Resonance Imaging (MRI) of brain with epilepsy protocol. Nearly 58% cases were diagnosed as mesial temporal sclerosis who were treated by anterior temporal lobectomy (ATL) with amygdalohippocampectomy (AH). Excision of epileptogenic foci was confirmed by preoperative Electro Cardiogram. Early response to surgery was good. However, a prolonged longitudinal follow up is essential for accurate assessment of seizure outcome.

Sign in / Sign up

Export Citation Format

Share Document