[Transient global amnesia and vascular risk factors].

INTRODUCTION

Transient global amnesia (TGA) is a clinical syndrome determined by an episode of less than 24 hours consisting of temporo-spatial disorientation with retrograde and anterograde amnesia followed by complete recovery.

OBJECTIVES

To determine whether the presence or absence of vascular risk factors (VRF) in patients with TGA is associated with different clinical data and/or examination findings.

PATIENTS AND

METHODS

A retrospective study was made of two groups of 13 and 12 patients with TGA, who presented with and without VRF, respectively. The following variables were determined: VRF, age, a previous history of migraine, triggering factors, duration and repetition of the episodes, associated neurological symptoms and findings obtained by neuroimaging, eco-Doppler of the supra-aortic trunks and transcranial Doppler. The data were subjected to statistical analysis by univariate analysis with Fischer's exact probability test.

RESULTS

The statistical studies showed no significant differences between the variables obtained in the two groups of patients.

CONCLUSIONS

Transient global amnesia has been particularly related to migraine, epilepsy and cerebral vascular pathology, although its aetiology has not been fully determined. In this study we compare clinical data between the two groups of patients with and without VRF who have had TGA. The lack of significant differences between them tends to rule out a vascular aetiology as the sole cause of this syndrome. Recently Leao's propagated depression has been suggested as the physiopathological mechanism involved. According to this theory, the vascular pathology might act as the trigger but probably not as the aetiological factor. The findings of our study may support this thesis.