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Related Experiment Videos

Functional magnetic ventilation in dogs.

Vernon W Lin1, Ian Hsiao, Xiaoming Deng

  • 1Functional Magnetic Stimulation Laboratory, Spinal Cord Injury-Disorder Health Care Group, Long Beach VA Healthcare System, CA 90822, USA. vernon.lin@med.va.gov

Archives of Physical Medicine and Rehabilitation
|September 18, 2004
PubMed
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Functional magnetic ventilation (FMV) using magnetic stimulation of inspiratory muscles was explored in dogs with spinal cord transection. While FMV was achieved, further refinements are needed to improve ventilation efficacy.

Area of Science:

  • Biomedical Engineering
  • Respiratory Physiology
  • Neuromuscular Stimulation

Background:

  • Mechanical ventilation is standard for respiratory support in spinal cord injury.
  • Alternative methods like functional electric stimulation have limitations.
  • Magnetic stimulation offers a non-invasive approach to muscle activation.

Purpose of the Study:

  • To evaluate the efficacy of functional magnetic ventilation (FMV) as an alternative to mechanical ventilation.
  • To assess magnetic stimulation of inspiratory muscles in a canine model with spinal cord transection.

Main Methods:

  • A prospective before-after trial was conducted in six male mongrel dogs with C2 spinal cord transection.
  • Commercially available magnetic stimulators targeted the C5-7 vertebrae.

Related Experiment Videos

  • Parameters included 80% intensity, 20 Hz, and specific pulse train durations.

    • Main Results:

    • Functional magnetic ventilation (FMV) generated an average tidal volume (Vt) of 0.47 L and tracheal pressure (Ptr) of -4.7 cmH2O.
    • Blood gas analysis revealed a significant increase in PaCO2 (33 to 75 mmHg) and a decrease in pH (7.33 to 6.99) over 1 hour.

    Conclusions:

    • Functional magnetic ventilation (FMV) was sustained for up to 2 hours in dogs with C2 spinal cord transection.
    • Current magnetic stimulation techniques require further refinement to optimize ventilation and gas exchange in animals.