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Cas du mois Février 2023 - Rythmologie-

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Now you see it, now you don’t

A 67-year old man, with no pathological history, presented to the cardiology department with seconds-long presyncopal episodes. Outside hospital records showed a normal systolic function by transthoracic echocardiogram.

Here are his serial ECGs.

Illustrations:

What is your diagnosis?