[Transient global amnesia and vascular risk factors]

Area of Science:

• Neurology
• Clinical Neuroscience
• Vascular Neurology

Background:

• Transient global amnesia (TGA) is a temporary neurological condition characterized by disorientation and memory loss, lasting under 24 hours.
• The exact causes of TGA remain unclear, though associations with migraine, epilepsy, and cerebrovascular disease have been noted.

Purpose of the Study:

• To investigate if vascular risk factors (VRF) influence the clinical presentation and examination findings in patients experiencing TGA.
• To compare TGA patient groups with and without VRF to identify potential differences in their clinical profiles.

Main Methods:

• A retrospective study comparing two groups of TGA patients: one with VRF (13 patients) and one without (12 patients).
• Data collected included VRF status, age, migraine history, triggers, episode duration/repetition, neurological symptoms, and neuroimaging/Doppler findings.
• Statistical analysis employed univariate analysis with Fischer's exact probability test to compare the groups.

Main Results:

• No statistically significant differences were observed in the analyzed variables between TGA patients with and without vascular risk factors.
• This finding indicates that the presence or absence of VRF did not correlate with distinct clinical or examination findings in the studied TGA cohort.

Conclusions:

• The lack of significant differences between TGA patients with and without VRF challenges the notion of vascular aetiology as the sole cause of TGA.
• Findings support the hypothesis that Leão's spreading depression may be the underlying mechanism, with vascular pathology potentially acting as a trigger rather than the primary cause.
• Further research is needed to fully elucidate the multifactorial aetiology of transient global amnesia.