Neuropharmacological investigations in the stiff-man syndrome
β Scribed by H. M. Meinck; B. Conrad
- Publisher
- Springer
- Year
- 1986
- Tongue
- English
- Weight
- 770 KB
- Volume
- 233
- Category
- Article
- ISSN
- 0340-5354
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β¦ Synopsis
In a patient with the stiff-man syndrome, abnormal exteroceptive reflexes in hand and arm muscles were used as a tool for investigating the effects of various centrally acting adrenergic drugs by means of acute testing. Clonidine, tizanidine and methamphetamine induced reflex suppression whereas reserpine had a biphasic effect: transient reflex suppression and delayed reflex enhancement. The drug actions on the reflexes paralleled to some degree those on the muscle stiffness. It is concluded that alpha-adrenergic stimulation leads to reflex suppression and muscular relaxation, whereas alpha-adrenergic blockade has the opposite effect. Correspondingly, long-term oral treatment with the alpha-stimulator, tizanidine, proved successful. The hypothesis is put forward that a noradrenergic system which exerts a net inhibitory influence on muscle tone and on exteroceptive reflexes plays an important role in the pathogenesis of the stiff-man syndrome.
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broadens the considerable clinical heterogeneity of movement disorders reported in late-onset HD. tromyographic pattern of continuous muscle activity at rest in the affected muscles. Muscle spasms and axial stiffness usually improve with diazepam or baclofen.' Since the initial description of SMS b
## Abstract An additional case of the stiffβman syndrome manifested by extremely painful, fluctuating muscular spasm and rigidity is reported. Eighteen cases previously reported in the literature are reviewed, and the accumulated indications for a metabolic defect and/or myopathy are presented.