[Usefulness of electroencephalograms in evaluating transient global amnesia]

Area of Science:

• Neurology
• Clinical Neurophysiology

Background:

• Transient global amnesia (TGA) presents a clear clinical picture, but its underlying cause remains unknown.
• Leading theories propose vascular, migraine-related, or epileptiform origins for TGA.

Purpose of the Study:

• To determine if a consistent electroencephalogram (EEG) pattern exists in patients experiencing TGA.
• Investigate the diagnostic utility of EEG in TGA cases.

Main Methods:

• Retrospective analysis of 345 patients undergoing EEG after a TGA episode.
• Evaluation of EEG findings for pathological significance and recurring patterns.

Main Results:

• Approximately 20% of EEGs revealed abnormalities, with most (64%) being of minor pathological significance.
• Two patients exhibited subclinical rhythmic electroencephalogram discharges of adults, a pattern with unclear significance previously linked to TGA.

Conclusions:

• A notable percentage of TGA patients show EEG alterations, though often minor or attributable to other conditions.
• No consistent EEG pattern was identified, indicating low diagnostic effectiveness of EEG for TGA.
• Systematic EEG testing in suspected TGA cases warrants reconsideration.