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Related Concept Videos

Motor Unit Stimulation01:20

Motor Unit Stimulation

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.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Esophageal Achalasia01:27

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Esophageal achalasia is a chronic neurogenic disorder characterized by impaired relaxation of the lower esophageal sphincter (LES) and absent or ineffective peristalsis in the distal esophagus. This leads to a functional obstruction without a physical blockage, despite significant disruption of esophageal motility.EtiologyAchalasia is caused by degeneration of the myenteric (Auerbach's) plexus, specifically the loss of inhibitory ganglion cells that produce vasoactive intestinal peptide (VIP)...
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...

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Related Experiment Video

Updated: Jul 7, 2026

Vagus Nerve Stimulation As an Adjunctive Neurostimulation Tool in Treatment-resistant Depression
04:29

Vagus Nerve Stimulation As an Adjunctive Neurostimulation Tool in Treatment-resistant Depression

Published on: January 7, 2019

Hardware failure in vagus nerve stimulation therapy.

K Rijkers1, M W Berfelo, E M J Cornips

  • 1Department of Neurosurgery, Maastricht University Hospital, Maastricht, The Netherlands. kimrijkers@gmail.com

Acta Neurochirurgica
|February 19, 2008
PubMed
Summary

A broken vagus nerve stimulator (VNS) caused exercise-induced side effects in an epilepsy patient. Replacing the VNS device restored seizure control and resolved symptoms.

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Last Updated: Jul 7, 2026

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Area of Science:

  • Neurology
  • Biomedical Engineering

Background:

  • Vagus nerve stimulation (VNS) is an established treatment for refractory epilepsy.
  • Long-term VNS therapy can achieve significant seizure frequency reduction.
  • Device integrity is crucial for sustained therapeutic efficacy.

Observation:

  • A 20-year-old male with a 7-year history of successful VNS therapy for epilepsy reported new-onset hoarseness, throat pain, and dyspnea during exercise.
  • These symptoms suggested a potential malfunction of the VNS pulse generator.
  • Surgical intervention was planned for device replacement.

Findings:

  • Intraoperative examination revealed the VNS pulse generator had fractured into two pieces.
  • The fracture was attributed to an unstable connection between the battery and connector subunits.
  • Replacement with a new pulse generator successfully restored the patient's 50% seizure frequency reduction.

Implications:

  • This case highlights a rare but significant mode of VNS device failure.
  • Mechanical failure of implanted devices can lead to symptom recurrence or new adverse events.
  • Regular monitoring and prompt surgical intervention are essential for managing VNS device complications.