[Transient global amnesia. With a contribution to its prognosis].

The risk of recurrency in transient global amnesia was calculated from eight representative studies published in the literature comprising a total of 622 patients, and from a personal survey in 122 patients to be 3.4%/year. Within a mean period of observation of five years, a first recurrency was followed by one further amnesic attack in 1/5 and by two or more attacks in 1/10. Stroke risk proved not to be higher than in a normal population of the respective age groups. A residual syndrome of disturbed long term verbal memory may be seen even after a single attack.