Analysis of the electromyographieal character of Parkinson's tremor / 中华神经科杂志

ABSTRACT

Objective To investigate the electromyngraphy eharacteristies of Parkinsen's disease (PD) by studying tremor frequency, intensity and drug response. Methods Sixty-six patients with PD hospitalized during March 2005 to May 2006 were re-evaluated and recruited into the study. A ten-channel electromyography recorded the frequency and intensity of the rest tremor and postural tremor. Tremor analysis soft was used to statistically analyze differences between the two types of tremor, correlation between the frequency and intensity, and changes after regular administration of dopaminergic medication. Results The frequencies of rest tremor ((4. 79±0.69 ) Hz) and postural tremor ( (5.54±1.18) Hz ) showed statistical differences (F = 33.5, P<0. 01), but the intensity of rest tremor (0.016-421.700 (rag)2) and postural tremor (0.062-217.900 (mg)2) didn't show statistical differences (F=1.917, P>0.05 ). No regression relation was revealed between the frequency and intensity of tremor (r=0.09, P>0.05). After dopaminergic medication treatment, the intensity declined significantly from 0.016-421.700 (mg)2 to 0.027-82.200 (mg)2(F=5.179,P <0.05), but the difference of frequencies of tremor between before ( (5.09±0.85) Hz) and after treatment ( (5.20 ± 1.08 )Hz) was not significant (F = 0.474, P > 0.05). Conclusions There may be different mechanisms for the rest tremor and postural tremor in PD. There is no correlation identified between the frequency and intensity in PD and this is may be resulted from variability of tremor intensity. Dopaminergic can relieve the symptom of tremor, but it doesn't reduce the frequency of tremor.