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Phantom limb pain induced in amputee by strong magnetic fields
W T Yuh1, D J Fisher, R K Shields
1Department of Radiology, University of Iowa Hospitals and Clinics, University of Iowa College of Medicine, Iowa City 52242.
Journal of Magnetic Resonance Imaging : JMRI
|March 1, 1992
Summary
Magnetic fields from MRI scanners exacerbated phantom limb pain in an amputee. The residual limb showed heightened sensitivity to electrical stimulation, mimicking the pain experienced near MRI machines.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Pain Management
Background:
- Phantom limb pain is a common complication following amputation.
- Magnetic Resonance Imaging (MRI) utilizes strong magnetic fields and radiofrequency pulses.
- The potential effects of MRI environments on neuropathic pain are not fully understood.
Observation:
- A traumatic amputee reported a significant increase in phantom limb pain when in close proximity to two different MRI scanners.
- The patient's pain levels were assessed using a visual analog scale.
- Electrical stimulation tests were performed on the residual limb.
Findings:
- The residual limb exhibited an unusual hypersensitivity to low-level electrical currents, below the threshold typically causing muscle contraction.
- The induced pain from electrical stimulation closely replicated the symptoms experienced by the patient when exposed to MRI magnetic fields.
- This suggests a potential link between electromagnetic field exposure and the modulation of phantom limb pain.
Implications:
- Findings suggest that electromagnetic fields, such as those generated by MRI, may exacerbate phantom limb pain in sensitive individuals.
- Further research is warranted to explore the neurophysiological mechanisms underlying this interaction.
- This could inform safety guidelines and patient management strategies for amputees undergoing MRI scans.