The effect of motor cortex stimulation in deafferentated rats.
OBJECTIVE
The aim of the study was to describe the effect of motor cortex stimulation (MCS) on pain thresholds in deafferentated rats.


METHODS
The effect of MCS was studied in 18 deafferentated and 14 intact laboratory rats, using a standardised plantar test and tail-flick latencies. Two inoxious stimulation electrodes were implanted subdurally over the cerebral cortex and a C5-Th1 dorsal root rhizotomy was performed on the left side. Pain thresholds were measured before and after cortical stimulation. The data were analysed with ANOVA for repeated measures.


RESULTS
MCS in intact animals evoked no changes in pain thresholds except for the contralateral forelimb, in which the pain threshold increased after MCS. Following deafferentation, pain thresholds increased in both plantar test and tail-flick in comparison to baseline values. When MCS was applied to the deafferentated animals, the pain thresholds returned to baseline levels. The effect of MCS disappeared within 24 hours.


RESULTS
1. MCS in intact animals evoked hypoesthesia in the corresponding contralateral forelimb; 2. deafferentation itself increased pain thresholds in the unaffected limbs; 3. under MCS, pain thresholds in deafferentated rats were not different from pre-dafferentation values; 4. the effect of MCS disappeared in 24 hours and oscillated.


CONCLUSIONS
Our results show a similar effect of the stimulation in man and experimental animals despite the differences in the organisation of the cerebral cortex. The use of laboratory animals is promising for further studies in the field of involved antalgic mechanisms of MCS.
Rusina
Robert
R
Charles University, 3rd Faculty of Medicine, Department of Normal, Pathological and Clinical Physiology, Prague, Czech Republic.
Vaculin
Simon
S
Yamamotova
Anna
A
Barek
Stephan
S
Dvorakova
Helena
H
Rokyta
Richard
R
D000818:Animals; D002422:Causalgia / Q000503:physiopathology*; D003714:Denervation; D004558:Electric Stimulation; D005260:Female; D008297:Male; D009044:Motor Cortex / Q000502:physiology*; D009619:Nociceptors / Q000502:physiology; D017288:Pain Threshold / Q000502:physiology*; D051381:Rats; D020318:Rats, Long-Evans; D019051:Rhizotomy