[Somatosensory evoked potentials in the acute phase of focal cerebral ischemia]. / Somatosenzitivní evokovaný potenciál v akutní fázi loziskové mozkové ischémie.

ABSTRACT

The authors made 38 examinations of the somatosensory evoked potentials of the median nerve (SEP) in 28 patients in the acute stage of focal cerebral ischaemia (20 men, 8 women mean age 62 years; range 28-81). According to the clinical and CT picture the patients were divided into two groups affections in the carotid vessels (22 patients) and in the vertebrobasilar vessels (6 patients). The investigated parameters comprised the so-called central conduction time (interval N13-N19) and amplitude N19/P22. The highest incidence of abnormalities was in the group of vertebrobasilar ischaemias (83%), while in the group of ischamias in the carotid vessels it amounted only to 50%. In both the central conduction time as well as amplitude N19/P22 were effected. In the group of focal ischaemias the authors did not find a close correlation between the carotid circulation and the sensory deficit, but recorded a correlation between the affection of SEP and the resultant condition in patients without SEP abnormalities complete restoration of the condition predominated (63%), while in the group with pathological findings during the SEP examination complete restoration was recorded only in 9%. Repeated (dynamic) evaluations and the relationship between the ischaemic focus and the somatosensory pathway are important.