A Preliminary Study On Motion Evoked Potential Of Palate Muscle By Transcranial Magnetic Stimulation

Objective To investigate the characteristics and differences between congenital cleft palate patients and health adult the nerve conduction was studied by stimulus the cerebral cortex with Transcranial Magnetic Stimulation(TMS).Methods 20 preoperative and postoperative congenital cleft palate patients and 20 health adults were accepted the TMS in cerebral cortex.Stimulating signal conduct to the palate muscle through nerves,which produce the evoked potential.The surface electrodes were local in soft palate to receive Motion Evoked Potential(MEP).Results The latent period and amplitude of left side and right side is 2.66±0.51ms/D and 2.68±0.39 ms/D;35.69±6.38μV and 35.92±8.85μV respectively in control group.The latent period and amplitude of left side and right side is 4.09±0.89ms/D and 4.15±0.75ms/D;27.6±5.98μV and 26.6±6.45μV respectively in preoperative cleft palate patients.The latent period and amplitude of left side and right side respectively is 3.31±0.51ms/D and 3.50±0.85ms/D;29.3±4.77μV and 28.9±5.5μV in postoperative cleft palate patients.There are differences between control group and congenital cleft palate group in latent period and amplitude(P<0.05). Compared between preoperative and postoperative group,there are differences in latent period(P<0.05),but no difference in amplitude(P>0.05).There are no difference between the two sides of these groups in latent period and amplitude(P>0.05).Conclusion The latent period of cleft palate patient is longer than the control group's and result in reducer amplitude.There maybe the abnormal in the nerve conduction in cleft palate patients and it might result in dysfunction of palate muscle.It should be one of the causes of pathologic speech in cleft palate patients.