17th August 2023

A 70-year-old female presents to A&E with a history of sudden difficulty understanding speech and expressing herself

A 70-year-old female presents to A&E with a history of sudden difficulty understanding speech and expressing herself, which lasted for 30 minutes before spontaneously resolving. She has a past medical history of atrial fibrillation and is on warfarin. Her speech is clear on examination, and no neurological deficits are found. An ECG confirms atrial fibrillation.

What is the most likely diagnosis?