Mamoli B, Neumann H
Laryngol Rhinol Otol (Stuttg). 1976 Mar;55(3):196-200.
In a previous study the authors discussed the value of the determination of the compound action potential amplitude of the m. orbicularis oris following supramaximal stimuli of the facial nerve for the prognosis of facial paresis. In this study they investigate the suitability of the determination of the latency periods for an early prognosis. The latency periods in 20 normal subjects and 26 patients with idiopathic facial paresis were messured and continuously checked. The study reveals that a difference of more than 0.5 msec. between the latency periods of normal and paretic patients does not even permit the proof of peripheral lesions in patients with partial denervation or absent or insufficient recovery. Ocassionally, even shorter latency were observed in paretic patients, which are probably due to a local increase of the threshold for supramaximal stimuli around the stimulation electrode. The necessary increase of the stimulus intensity probably leads to a nervous excitation further distally. Contrary to the observations of other authors these studies indicate that the determination of the latency does not constitute a useful prognostic criterion for idiopathic facial paresis; for an early prognosis the measurement of latency is less reliable than the determination of the compound action potential amplitude.
在之前的一项研究中，作者讨论了在面神经进行超强刺激后测定口轮匝肌复合动作电位幅度对面神经麻痹预后的价值。在本研究中，他们调查了测定潜伏期用于早期预后的适用性。对20名正常受试者和26名特发性面神经麻痹患者的潜伏期进行了测量并持续检查。研究表明，正常受试者和麻痹患者的潜伏期差异超过0.5毫秒，甚至无法证实部分失神经支配或恢复缺失或不足的患者存在周围神经病变。偶尔，在麻痹患者中甚至观察到更短的潜伏期，这可能是由于刺激电极周围超强刺激的阈值局部升高所致。刺激强度的必要增加可能会导致更远端的神经兴奋。与其他作者的观察结果相反，这些研究表明，测定潜伏期并非特发性面神经麻痹有用的预后标准；对于早期预后，潜伏期的测量不如复合动作电位幅度的测定可靠。
