A 22-year-old female presented with a history of palpitations. During follow-up the electrocardiogram (ECG) shown below (Fig. 1) was recorded. Her baseline ECG during sinus rhythm showed no pre-excitation. Physical examination and echocardiogram were both unremarkable.
Fig. 1
ECG at presentation
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What is the most likely diagnosis for the arrhythmia?
Answer
You will find the answer elsewhere in this issue.
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