The transient global amnesia-migraine connection.

Area of Science:

• Neurology
• Neuroimaging
• Vascular Neurology

Background:

• Transient global amnesia (TGA) is a distinct neurological condition characterized by sudden, temporary memory loss.
• The underlying pathophysiology of TGA remains incompletely understood.
• Migraine is a common neurological disorder, and its association with TGA has been hypothesized.

Observation:

• This study investigated regional cerebral blood flow (rCBF) in twelve patients experiencing TGA.
• Seven patients (58%) reported headaches during their TGA episodes, and five (42%) were diagnosed migraineurs.
• Regional cerebral blood flow was measured using the xenon Xe 133 inhalation method.

Findings:

• Five of seven tested patients exhibited abnormal rCBF patterns.
• These abnormalities included impaired vasomotor response in watershed areas and/or focal ischemia in the inferior temporal lobe.
• The observed rCBF patterns in TGA were distinct from those typically seen in carotid or vertebrobasilar transient ischemic attacks (TIAs).

Implications:

• The findings suggest that vasomotor phenomena, potentially linked to migraine, may play a significant role in the etiology of TGA.
• This research differentiates TGA pathophysiology from other cerebrovascular events like TIAs.
• Further investigation into the migraine-TGA connection could reveal new diagnostic and therapeutic targets.