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Related Concept Videos

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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
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Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Vagus nerve stimulation for partial seizures.

Mariangela Panebianco1, Alexandra Rigby, Jennifer Weston

  • 1Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Clinical Sciences Centre for Research and Education, Lower Lane, Liverpool, UK, L9 7LJ.

The Cochrane Database of Systematic Reviews
|April 4, 2015
PubMed
Summary
This summary is machine-generated.

Vagus nerve stimulation (VNS) effectively reduces seizure frequency in drug-resistant epilepsy. High-level VNS is more effective than low-level VNS, with manageable side effects like hoarseness and dyspnea.

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Area of Science:

  • Neurology
  • Neurosurgery
  • Epileptology

Background:

  • Vagus nerve stimulation (VNS) is an adjunctive therapy for medically refractory epilepsy.
  • Up to 30% of epilepsy patients develop drug-resistant epilepsy, necessitating advanced treatments.
  • This review updates evidence on VNS efficacy and tolerability for drug-resistant partial epilepsy.

Purpose of the Study:

  • To evaluate the seizure reduction effects of VNS compared to control (low-level stimulation).
  • To assess the adverse effect profile of VNS compared to control.
  • To determine the efficacy and tolerability of VNS in drug-resistant partial epilepsy.

Main Methods:

  • Systematic review of randomized, double-blind, controlled trials of VNS for drug-resistant partial seizures.
  • Searched multiple databases including Cochrane, MEDLINE, and SCOPUS up to February 2015.
  • Assessed outcomes such as seizure frequency reduction, treatment withdrawal, and adverse effects.

Main Results:

  • High-frequency VNS demonstrated over 1.7 times greater efficacy in reducing seizure frequency compared to low-frequency VNS (RR 1.73, 95% CI 1.13 to 2.64).
  • Adverse effects included hoarseness (RR 2.17) and dyspnea (RR 2.45), with moderate to low quality evidence.
  • Treatment withdrawal rates were low, suggesting good tolerability, though data was limited.

Conclusions:

  • VNS is an effective and generally well-tolerated treatment for drug-resistant partial seizures.
  • High-stimulation VNS is significantly more effective than low-stimulation VNS for seizure reduction.
  • Further high-quality research is recommended to fully establish VNS efficacy and tolerability.