Brainstem auditory and visual evoked potential studies in patients with chronic cervical pain.

Brainstem auditory evoked potential (BAEP) and visual evoked potential (VEP) studies were undertaken in 8 patients with chronic cervical pain associated with auditory and visual symptoms of more than 6 months duration. The purpose of the study was to ascertain possible central abnormalities, including posterior cervical sympathetic syndrome (Barre-Lieou syndrome), in their auditory and/or visual pathways. Patients who had been treated surgically for cervical pain were excluded from the study group. All patients had normal cervical radiographs and electromyographic findings. Six also had normal CT scans and myelograms. A criterion of the study was that abnormal results would be considered significant only if ophthalmological and/or otolaryngological work-ups failed to reveal an underlying organic abnormality. The TECA-TE 42 was used throughout the study, as well as the international Ten-Twenty System of Electrode Placement. The results showed no abnormalities in the latency, amplitude, or waveform morphology of the evoked potentials. BAEP and VEP studies do not appear to reveal central abnormalities of the auditory and visual pathways in this group of patients. However, in view of the small number of patients included in the study, no conclusions can be made with certainty and the study is continuing.