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Rehabilitation Practice and Science

Translated Title

磁場刺激單側腦皮質下中風忠者復原期之快速傳導路徑反應波之變化

Abstract

SMagnetic stimulation applied to the scalp over the normal motor cortex caused short latency response of contralateral limb muscles. 12 patients with unilateral subcortical stroke for the first time were selected. They had hemiparesis and good motor recovery up to individual finger movements, although mild weakness and clumsiness of affected limbs were still complainted of. Of the twelve patients (eleven men and one woman) the mean age were 54.8±9.3 years. Lesion sites included basal ganglia, thalamus and corona radiata, with six hemorrhage and six infarction. Time since stroke onset to magnetic stimultation were 19.7±23.3 months. Motor conduction latencies from cortex to bilateral first dorsal interossei and extensor digitorum brevis were recorded.The latency of normal short latency response over the unaffected motor cortex were 21.7±1.3 msec in FDI and 39.7±4.8 msec in EDB. Stimulation of the affected cortex showed significantly delayed motor conduction latencies than unaffected side in FDI (23.5±2.5 msec) and EDB (42.0±8.6 msec). The amplitude of cortical motor action potential in most cases of the affected limbs were smaller but some are larger than normal. In conclusion, the short latency response can be found in the stroke patients with motor recovery to individual movement stage. That infered the correlation between fine motor control and short latency cortical pathway. The latency delay of short latency response and amplitude decrease in CMAP might explain the mild clumsiness and weakness of patients. The mechanism of CMAP amplitude over-shooting in some affected side needs further investigation.

Language

Traditional Chinese

First Page

7

Last Page

13

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