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KMID : 0361419960200041007
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Journal of Korean Academy of Rehabilitation Medicine
1996 Volume.20 No. 4 p.1007 ~ p.1013
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Brainstem Auditory Evoked Potentials Recorded from Nasopharyngeal Wall
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Abstract
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Brainstem auditory evoked potential study was performed in 20 healthy young adults with earlobe recording and nasopharyngeal wall recording techniques. The peak latency, interpeak latency and amplitudes of five waves were evaluated to compare the
clinical usability of the two methods and to understand the relationship between the waves and generator sources. Active electrode was placed at the ipsilateral earlobe with silver-silver chloride surface, disk electrode in earlobe recording
technique.
For nasopharyngeal wall recording, we designed specific recording electrodes which are made of silver bulb(diameter 2.5mm) with 10cm extended insulated lead. The tip of the recording electrode is placed at the nasopharyngeal wall through nasal
cavity to
approach anatomically closer site from the generator sources, brainstem. The reference electrode was placed at Fz in both methods. Nasopharvngeal wall recording reveals longer peak V latency, larger amplitude in peak II and IV, and smaller
amplitude in
peak III than ear-lobe recording (p<0.05). The difference may be originated from the change of anatomical and spatial orientation between active electrode and potential generator sources.
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