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Question category: Cardiology

A 29 year old male presents with a history of intermittent palpitations. He is normally fit and well. He is a non smoker and takes little alcohol. These episodes can last for a few minutes to an hour. He is aware of his heart racing, it feels regular but very fast and he feels dizzy and short of breath. He has not noticed any triggering factors. There is no family history of any heart disease. Examination is normal Which of the following is the most likely diagnosis?

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