[Measurement and clinical using of motor conduction latency time and motor conduction latency rate of facial nerve in health subjects and facial paralysis patients].

The motor conduction latency time (MCLT) and rate (MCLR) of facial nerve in 70 cases of health subjects and 60 cases of facial paralysis patients were measured using evoke EMG. The results showed that MCLT is below 4 ms and MCLR is above 25 m/sec in 70 cases of health subjects, while the MCLT is above 4 ms and MCLR is below 25 m/sec in 60 cases of facial paralysis patients. We have observed the difference of MCLR and MCLR on different age groups in health subjects. The results showed that MCLT is prolonged gradually and MCLR is gradual reduced after 50 years old groups. But the MCLT does not exceed 4 ms and MCLR is not slower than 25 m/sec. The results of this studies suggested that if MCLT is above 4 ms, and MCLR is below 25 m/sec, it is a index of facial nerve paralysis.