Apr 1, 1994

Differences in behaviour of sensory and motor axons following release of ischaemia

Brain : a Journal of Neurology
Hugh BostockJ P Hales


The changes in excitability and supernormality of sensory and motor axons of the median (or ulnar) nerve were tracked during and following ischaemia at the wrist for periods of 5-20 min in normal human volunteers. Supernormality was defined as the fractional increase in excitability produced by a maximal conditioning stimulus, 10 ms before the test stimulus. With relatively brief periods of ischaemia (< 10 min), sensory and motor axons behaved similarly, with an increase in excitability (producing a decrease in threshold) and a decrease in supernormality during ischaemia and a long-lasting decrease in excitability (and increase in supernormality) following release of ischaemia. Most subjects reported paraesthesiae during brief periods of ischaemia but not after its release. No one experienced fasciculation. The threshold changes were generally similar during longer periods of ischaemia, but in the post-ischaemic phase the behaviour of sensory and motor axons diverged. After a rapid post-ischaemic increase, the threshold of sensory axons decreased, approaching the pre-ischaemic level, before rising again and then slowly returning to the control level. Sensory axons of different threshold behaved in a qualitatively similar manner...Continue Reading

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Mentioned in this Paper

Reaction Time
Motor Neurons
Painful Paresthesias
Sensory Thresholds
Nerve Impulses

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