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  • Title: [The new parameters of motor unit potential in the diagnosis of neurogenic lesions in spike-triggered averaging electromyography].
    Author: Liu X, Wang G, Qiu H.
    Journal: Zhonghua Yi Xue Za Zhi; 1997 Nov; 77(11):838-42. PubMed ID: 9772478.
    Abstract:
    OBJECTIVE: To evaluate the clinical significance of the new parameters of motor unit potential (MUP) to the diagnosis of neurogenic lesions. METHODS: Three groups of muscles, anterior tibialis, abductor pollicis brevis and vastus medialis were studied with spike-triggered averaging electromyography (EMG). A total of 3,646 MUPs, 1,903 from normal group and 1,743 from neurogenic group, were recorded under slight muscle contraction. RESULTS: The area, as a single parameter, produced the most significant result in discriminant analysis, about 80% MUPs from neurogenic muscles being judged to be abnormal. Compared with the area, the amplitude and duration were less sensitive, being able to assign about 77% and 70% of MUPs in the neurogenic group as abnormal. A combination of the area/amplitude ratio (thickness) and the amplitude, and a combination of the duration (width) and the amplitude could further improve the discriminating ability, around 80% and 81% MUPs in the neurogenic muscles being classified as abnormal by the combinations. The simplified discriminant functions, 2 x Log10 (amplitude) +Log10 (area/amplitude) -4 for size index, and 5 x Log10 (duration) + 3 x Log10 (amplitude) -10 for width-height index had same discriminating ability as the real discriminant function. CONCLUSIONS: The new parameters, SI, WHI and area in spike-triggered EMG seemed to be promising, since they produced a better yield in the diagnosis of neurogenic lesions than amplitude or duration alone in the discriminant analysis.
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