Quick Answer
Epilepsy surgery evaluation is considered when seizures continue despite adequate medication trials. Thorough presurgical assessment identifies surgical candidates.
Medically reviewed by Dr. Jitendra Prasad Yadav • NMC 8029 • Kathmandu Neurology Clinic & Cognitive Center
Epilepsy surgery is considered when seizures continue despite adequate medication trials. The International League Against Epilepsy (ILAE) defines drug-resistant epilepsy as failure of adequate trials of two tolerated, appropriately chosen antiepileptic drug schedules — whether as monotherapy or in combination — to achieve sustained seizure freedom. Approximately 30% of people with epilepsy meet this definition, and many of these patients are candidates for surgical evaluation.
The presurgical evaluation process begins with confirming the diagnosis and characterising the seizure type and epilepsy syndrome. Not all drug-resistant seizures are suitable for surgery — the evaluation determines whether a focal seizure onset can be identified and whether surgical removal of the focus is feasible without causing unacceptable neurological deficit.
Dr. Jitendra Prasad Yadav — consultant neurologist & headache specialist at Kathmandu Neurology Clinic & Cognitive Center provides evidence-based evaluation for epilepsy.
Video-EEG monitoring is the cornerstone of presurgical evaluation. Prolonged video-EEG recording (typically 5–7 days as an inpatient) captures the patient’s habitual seizures and correlates the clinical seizure pattern with the electrographic onset. This allows precise localisation of the seizure focus and helps determine whether the focus is confined to a resectable area. Scalp EEG may be supplemented by intracranial EEG (stereo-EEG or subdural grids) when non-invasive localisation is insufficient.
MRI brain with epilepsy protocol is essential. High-resolution MRI with dedicated epilepsy sequences (thin-cut coronal FLAIR, T2, and 3D T1) identifies structural abnormalities that may be the seizure focus — hippocampal sclerosis, cortical dysplasia, low-grade tumour, or vascular malformation. A normal MRI does not exclude surgical candidacy, but it significantly influences the evaluation pathway and the likelihood of a good outcome.
PET (positron emission tomography) and SPECT (single-photon emission computed tomography) are used when MRI is normal or when EEG localisation is discordant with MRI findings. PET typically shows hypometabolism in the seizure focus during the interictal period. SPECT, injected during a seizure, shows hyperperfusion at the onset zone. These functional imaging modalities complement structural MRI and help triangulate the seizure focus.
When surgery helps: Anterior temporal lobectomy for mesial temporal lobe epilepsy (hippocampal sclerosis) has the strongest evidence base, with 60–80% seizure freedom rates in well-selected patients. Extratemporal and frontal lobe resections have lower but still meaningful success rates. For patients who are not candidates for resective surgery, palliative procedures such as vagus nerve stimulation (VNS) or corpus callosotomy may be discussed.
Realistic expectations: Surgery does not guarantee seizure freedom in all patients. The goal is meaningful seizure reduction — even a reduction from daily seizures to rare seizures represents a significant improvement in quality of life, driving eligibility, and independence. Not all patients are surgical candidates, and the evaluation process itself is designed to identify those who will benefit.
Dr. Jitendra Prasad Yadav (NMC 8029) evaluates drug-resistant epilepsy patients at Kathmandu Neurology Clinic & Cognitive Center (Durbar Marg, Opposite of Yak & Yeti Hotel) and coordinates presurgical workup with video-EEG monitoring, epilepsy protocol MRI, and specialist referral when surgical candidacy is identified. Bring a detailed seizure diary, medication list, and prior EEG and MRI reports to the consultation. NMC registration: 8029.
This article is educational and does not replace individual medical advice.
Frequently asked questions
Answers reviewed by Dr. Jitendra Prasad Yadav • MBBS, MD (Internal Medicine), FICN (Neurology), FCNV, FIHM • NMC 8029
Not necessarily; a single unprovoked seizure needs careful assessment before a diagnosis of epilepsy is made.
No; seizures vary widely. Some involve jerking (generalized or focal), while others present as staring spells, automatisms, or behavioral change with no apparent movement.
Not necessarily. A single unprovoked seizure needs full assessment before diagnosing epilepsy. Provoked seizures have different implications.
Protect from injury, do not put objects in mouth, time the event, turn recovery position after jerking, call emergency if >5 minutes or injury.
No. A single unprovoked seizure is not epilepsy — epilepsy requires recurrence risk or syndrome criteria (ILAE 2014). Evaluation includes witness/video history, EEG ideally within 48 hours, and MRI when focal. Dr. Jitendra counsels on sleep, alcohol, adherence and driving per local rules, and medication only when risk …
Keep the person safe: ease them to the ground, turn onto side, clear nearby objects, do not put anything in mouth, time the event. If seizure lasts over 5 minutes, repeats without recovery, or breathing is impaired, call emergency. Afterward, arrange neurology evaluation with witness/video history for Dr. Jitendra.
More: All FAQs → · Ask Dr. Jitendra →
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References & Review
Reviewed by Dr. Jitendra Prasad Yadav • Last reviewed: 2026-09-04
- International Classification of Headache Disorders, 3rd edition (ICHD-3).
- Harrison's Principles of Internal Medicine — Neurology sections.
- American Academy of Neurology guidelines for selected conditions (where applicable).
Content is educational and aligns with standard medical references; individual evaluation may vary. External links provide context and do not imply endorsement.