Abstract
Out of 75 patients with TIA or PRIND we selected 9 TlAs and 6 PRINDs with normal EEGs and CCTs. full recovery of neurological function, no history of amaurosis fugax and no findings of visual impairments.
PVEPs were derived from 01-02 to Fz and Cz as ground following binocular pattern reversal visual stimuli of 1.9 Hz. Interhemispheric differences of the latencies of P60, N80, P100 and of the amplitudes N80/P100 and P100/N140 were compared with the corresponding parameters of 22 age matched controls. In contrary to the latency differences the interhemispheric difference of the amplitude N80/P100 was highly significantly larger (33.5 ± 16.0%) in patients than in the control group (12.8 ± 9.8%) (p <. 0005). The amplitude P100/N140 behaved the same way (p ≤. 025): the amplitude of the affected side being smaller. There were no statistical differences between TIAs and PRINDs and a tendency was seen for normalization of the differences with increasing time distances between the onset of the ischemic attack and the point of time of the recordings.
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