VNS: Magnets

• Block Magnet & Horseshoe Magnet
  • block magnet -- 1" x 5/8 " x 2" = 26mm x 17mm x 51 mm
    horseshoe magnet -- 2" x 3/4" x 2" = 52mm x 20mm x 51mm
  • The magnet may be used to start stimulation during an aura or at the beginning of a seizure. Although many people do not benefit from starting stimulation with the magnet, some report that their seizures are stopped, less intense and of a shorter duration. Magnet activation may be started by placing a magnet near the NCP Pulse Generator and then removing the magnet. Two differently shaped magnets are available from Cyberonics. The horseshoe magnet is strongest, but is also the largest. The block magnet is not as strong, but it is smaller and easier to store and manipulate. Both of these magnets can be used to start and stop stimulation.
  • Another way VNS therapy is delivered is when you, a family member or a caregiver senses a seizure coming on and passes the NCP magnet over the area in the chest where the generator is implanted to activate an extra, on-demand stimulation .
  • Holding the magnet steady over the implant will shut the device down until the magnet is removed.
  • The bar magnet's field strength is 65 gauss (0.0065 Tesla).
• Magnet Use = On Demand Seizure Control
  • Oncoming seizure, aura or seizure in progress - Swipe magnet over generator to start stimulation.
  • SOME people have:
    • stopped seizures
    • shortened seizures
    • decreased severity
    • improved post-ictal period
    • “taken control” - "carpe diem"
• Magnet Use = Side Effect Control
  • How To Stop Stimulation
    • Hold the magnet over the generator to temporarily stop stimulation
    • Removal of magnet will restart stimulation
  • Why Stop Stimulation?
    • Singing
    • Public speaking
    • During exercise
    • To facilitate swallowing, (eating or drinking) for people with pre-existing swallowing difficulties