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Principles of surgery for epilepsy
1Institute of Neurosurgery, Catholic University, Rome, Italy.
Abstract:
The pre-requisite conditions for surgical treatment of epilepsy are: ineffective pharmacotherapy, the unacceptable nature of the seizures and the presence of an organic brain lesion as the basis of the disease. The principles of surgery stem from knowledge of the anatomicofunctional structure and evolution of the epileptic process, which indicate the targets for surgery. Two main groups of surgical approaches are available. The first and most efficient one aims at suppressing the seizures by acting on the nucleus of origin of the epilepsy; the combined removal of both the causative cerebral lesion and the primary epileptogenic zone is considered as the "optimal" type of surgery (hemispherectomy, lobectomy, topectomy); only in rare cases is an ablation limited either to the causative lesion (mainly in children) or to the epileptogenic zone sufficient. The second group of surgical procedures aims at reducing the cerebral epileptogenicity by preventing diffusion of the epileptic discharges (callosotomy, subpial transections), by enhancing inhibitory (cerebellar stimulation) or reducing facilitatory influences (stereotactic deep lesions); these are regarded as a "second choice" treatment. The final surgical indication, the choice of the surgical approach and the surgical prognosis are dependent on accurate presurgical investigations. The very good results which can be obtained should favour the wider use of surgery.
Insights
Epilepsy surgery is an option when medications fail and seizures are severe, requiring precise targeting of the brain
Area of Science:
- Neurosurgery
- Epileptology
- Clinical Neurology
Background:
- Epilepsy surgery is indicated when pharmacotherapy is ineffective and seizures are unacceptable.
- The presence of an organic brain lesion is a prerequisite for surgical intervention.
- Understanding the anatomicofunctional aspects of epilepsy guides surgical targets.
Purpose of the Study:
- To outline the principles and approaches for surgical treatment of epilepsy.
- To define the optimal surgical strategies based on the epileptic process.
- To emphasize the importance of accurate presurgical investigations for surgical success.
Main Methods:
- Surgical approaches are categorized into seizure suppression and epileptogenicity reduction.
- Seizure suppression involves targeting the epilepsy's origin, often through lesionectomy or epileptogenic zone removal.
- Epileptogenicity reduction includes procedures like callosotomy, cerebellar stimulation, and stereotactic lesions.
Main Results:
- The "optimal" surgery combines removal of the causative lesion and the primary epileptogenic zone.
- Limited ablations of either the lesion or epileptogenic zone are sufficient in select cases.
- Second-choice procedures aim to reduce seizure spread or modulate brain activity.
Conclusions:
- Accurate presurgical evaluations are crucial for determining surgical indication, approach, and prognosis.
- The favorable outcomes of epilepsy surgery warrant broader consideration and application.
- Surgical intervention offers a viable and effective treatment option for refractory epilepsy.