Improved wave V resolution by dual-channel brain stem auditory evoked potential recording.

Brain stem auditory evoked potentials were recorded simultaneously from the vertex and ear contralateral to stimulation (Ac-Cz) and from the vertex and ear ipsilateral to stimulation (A1-Cz). There was clearer definition of wave V and less latency variability between trials in Ac-Cz channel recordings, resulting in enhanced wave form stability and greater reproducibility of wave I-V interpeak latencies. The clinical interpretation of dual-channel recordings is currently limited by the complexity of the auditory pathways, but the technique itself shows promise as a routine clinical procedure.