The peak amplitude of the M response from the extensor digitorum longus muscle (EDL) was measured in 26 healthy subjects (12 women and 14 men, aged 19 to 45 years) using conventional peroneal nerve stimulation at the fibular head. The mean amplitude of the EDL was 6.5 mV (+/- 1.3 mV) and 6.1 mV (+/- 1.2 mV) for the right and left sides, respectively. The side to side difference in amplitude of the M response was 0.4 mV (+/- 1.1 mV). Twenty-five of the twenty-six subjects had side to side amplitude differences within two standard deviations of the mean. None of the subjects had an EDL amplitude from the right lower limb over 1.8 mV less than that of the left, nor an EDL amplitude from the left lower limb over 2.8 mV less than that of the right. The technique used in the present study allows an accurate assessment of the M response amplitude from the EDL muscle. These reference data should prove useful in the evaluation of early focal nerve root injury (e.g. after 4 days, within 3 weeks) and in establishing prognosis for recovery in such conditions.

译文

使用腓骨头的常规腓神经刺激,在26名健康受试者 (12名女性和14名男性,年龄19至45岁) 中测量了趾长伸肌 (EDL) 的M反应峰值幅度。EDL的平均振幅在右侧和左侧分别为6.5 mV (+/- 1.3 mV) 和6.1 mV (+/- 1.2 mV)。M响应的振幅的左右差异为0.4 mV (+/- 1.1 mV)。26名受试者中有25名在平均值的两个标准偏差内具有左右振幅差异。没有一个受试者的右下肢EDL振幅1.8 mV小于左下肢的EDL振幅,左下肢的EDL振幅2.8 mV小于右下肢的EDL振幅。本研究中使用的技术可以准确评估EDL肌肉的M响应幅度。这些参考数据应被证明可用于评估早期局灶性神经根损伤 (例如,在4天后,3周内) 并确定在这种情况下恢复的预后。

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