Kouyoumdjian João Aris, Stålberg Erik V
Faculdade de Medicina de São José do Rio Preto, Department of Neurological Sciences, Neuromuscular Investigation Laboratory, Rua Luiz Antonio Silveira 1661, São Paulo 15025-020, Brazil.
Muscle Nerve. 2008 Jun;37(6):694-9. doi: 10.1002/mus.21043.
The aim of this study was to estimate normal jitter in voluntarily activated extensor digitorum communis (EDC) and orbicularis oculi (OOc) muscles using a disposable concentric needle electrode (CNE). The EDC of 67 normal subjects (22 males and 45 females, mean age 35.5 +/- 10.2 years) and the OOc of 50 normal subjects (13 males and 37 females, mean age 37.9 +/- 9.6 years) were studied. Jitter values were expressed as the mean consecutive difference (MCD) of 20 potential pairs. The mean MCD for EDC was 23.6 +/- 3.1 micros (upper 95% confidence limit [CL]: 29.7 micros). The mean MCD of all potential pairs (n = 1340) was 23.5 +/- 7.3 micros (95% CL: 38.2 micros). The mean MCD for the 18th highest value was 31.4 +/- 4.9 micros (95% CL: 41.2 micros). The mean MCD for OOc was 24.7 +/- 3.1 micros (95% CL: 31.0 micros). The mean MCD of all potential pairs (n = 1000) was 24.7 +/- 7.1 micros (95% CL: 39.0 micros). The mean MCD for the 18th highest value was 32.7 +/- 4.1 micros (95% CL: 40.9 micros). Our reported CNE jitter values obtained during voluntary activation represent the largest series currently available. The suggested practical limit in the EDC for mean MCD was 30 mus and for outliers was 42 micros, and in the OOc for mean MCD was 31 micros and 41 micros for outliers. The present study confirms that CNE can be used to assess jitter values, although certain precautions must be taken.
本研究的目的是使用一次性同心针电极（CNE）评估在自愿激活的指总伸肌（EDC）和眼轮匝肌（OOc）中正常的肌纤维震颤。对67名正常受试者（22名男性和45名女性，平均年龄35.5±10.2岁）的EDC和50名正常受试者（13名男性和37名女性，平均年龄37.9±9.6岁）的OOc进行了研究。肌纤维震颤值以20对电位的平均连续差值（MCD）表示。EDC的平均MCD为23.6±3.1微秒（95%置信上限[CL]：29.7微秒）。所有电位对（n = 1340）的平均MCD为23.5±7.3微秒（95% CL：38.2微秒）。第18个最高值的平均MCD为31.4±4.9微秒（95% CL：41.2微秒）。OOc的平均MCD为24.7±3.1微秒（95% CL：31.0微秒）。所有电位对（n = 1000）的平均MCD为24.7±7.1微秒（95% CL：39.0微秒）。第18个最高值的平均MCD为32.7±4.1微秒（95% CL：40.9微秒）。我们报告的在自愿激活期间获得的CNE肌纤维震颤值代表了目前可用的最大系列。建议EDC中MCD的实际限值为平均30微秒，异常值为42微秒；OOc中MCD的平均限值为31微秒，异常值为4l微秒。本研究证实，尽管必须采取某些预防措施，但CNE可用于评估肌纤维震颤值。
