Can J Neurol Sci
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In a patient receiving intrathecal baclofen injections for intractable trunk and leg spasms, positioning the subarachnoid catheter tip just caudal to the spinal segments innervating the spastic muscles enhanced the spasmolytic effect of bolus injections of intrathecal baclofen on the affected muscles. Such selective positioning of subarachnoid catheters may facilitate segmental spasmolysis with lower intrathecal doses of baclofen and provide an important alternative to relying only on ascending CSF concentration gradients of baclofen from chronic lumbar intrathecal infusion.
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The rationale, basic considerations, and technique of intraoperative nerve action potential (NAP) recording have been reviewed. Experience using this technique in several thousand patients over a 25 year period has been summarized. The most frequent serious nerve injury is one that leaves it in continuity. ⋯ Where resection of the lesion was based on absence of an NAP, the injury was, without exception, neurotmetic and/or one with poor potential for useful recovery without repair. Some lesions had an NAP across their lesion but a portion of the cross-sectional area appeared more seriously injured. By use of NAP recordings, a split repair was done and usually with good results.
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Previous studies using subjective tools to measure pain have shown that muscle exercise can have analgesic effects in man. The nociceptive leg flexion reflex (or RIII reflex) is a useful objective tool for assessing human pain. ⋯ Physical activity resulted in a significant increase (+53%) in the threshold of the nociceptive reflex in the athletes. The role of stress-induced analgesia, the reduction in perceived intensity of stimuli during movement, and the release of opioids are discussed.