VISUAL-EVOKED POTENTIALS - INFLUENCES OF PRIMARY BRAIN-STEM LESIONS ON THE SCALP TOPOGRAPHY

Visual evoked potentials were examined in 24 patients (mean age: 51.1 +/- 10.2 years) with primary brain stem lesion. Topographical recordin gs were performed within the first 3.1 +/- 2.7 days after onset of dis ease. The results showed an increase in the signal to noise ration-(SN R) parameter and the amplitude over the occipital region in patients w ith unfavourable outcome. These findings seem to indicate that the VEP topography probably can be used as an additional prognostic parameter in patients with primary brain stem lesions.