Comparison of spinal cord evoked potentials and peripheral nerve evoked potentials by electric stimulation of the spinal cord under acute spinal cord compression in cats.
METHODS
Spinal cord evoked potentials and peripheral nerve evoked potentials after spinal cord stimulation were recorded under acute spinal cord compression in 19 cats.


OBJECTIVE
To investigate the effects of acute compression upon grey matter and white matter by comparing both potentials.


METHODS
We compared peripheral nerve evoked potentials, recorded at the biceps brachii branch of the musculocutaneous nerve, with descending spinal cord evoked potentials, recorded from the lumbar spinal cord, by stimulation to the C2 level, under compression of the C6 segment.


RESULTS
The amplitude of both potentials decreased with increased compression. The second wave of peripheral nerve evoked potentials, which are motor fibre action potentials, decreased sooner than those of the spinal cord evoked potentials.


CONCLUSIONS
These findings indicate that peripheral nerve evoked potentials are sensitive to acute damage of the segmented compression. This suggests that grey matter is more vulnerable to compression than white matter.
Arai
M
M
Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan.
Goto
T
T
Seichi
A
A
Miura
T
T
Nakamura
K
K
D000818:Animals; D002415:Cats; D004558:Electric Stimulation; D005071:Evoked Potentials / Q000502:physiology*; D010525:Peripheral Nerves / Q000503:physiopathology*; D013116:Spinal Cord / Q000473:pathology / Q000503:physiopathology*; D013117:Spinal Cord Compression / Q000473:pathology / Q000503:physiopathology*; D013126:Spinal Nerve Roots / Q000473:pathology / Q000503:physiopathology