Brain, Vol. 114, No. 2, 907-913, 1991
© 1991 Oxford University Press
research-article |
DIFFERENTIAL EFFECT OF COMPRESSION-ISCHAEMIA BLOCK ON WARM SENSATION AND HEAT-INDUCED PAIN
Department of Neurology, Good Samaritan Hospital and Medical Center, and Oregon Health Sciences University Portland, Oregon, USA
The effect of compression-ischaemia nerve block on psychophysical thresholds for warm sensation and heat-induced pain was studied on 19 normal human volunteers. Although those two sensory submodalities should be predicted to block simultaneously, based on the fact that both are served by unmeylinated primary afferents, it was actually found that warm sensation was much more vulnerable to compression-ischaemia than heat-induced pain. This is interpreted as resulting from different summation requirements for each of the two sensory modalities; sensation of warmth depends on spatial summation to a larger extent than heat-induced pain. Such differential vulnerability is in line with recent clinical studies reporting deterioration of warm sensation associated with preservation of heat pain in peripheral nerve disorders caused by diabetes, ageing and other neuropathic processes.
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Received August 15, 1989. Accepted June 9, 1990.
1Present address: Department of Neurology, Rambam Medical Center, Haifa 35254, Israel, to whom correspondence should be addressed
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