A previously well 64-year-old man presented with 2
episodes of non-vertiginous giddiness during exercise. The
patient had no history of drug use, prior history of syncope
or family history of sudden cardiac death. Systolic blood
pressure was 55 mmHg on presentation at the emergency
department, with the presenting electrocardiography
(ECG) shown (Fig. 1). Synchronised cardioversion was
successfully performed and the postcardioversion ECG
is as below (Fig. 1). The patient underwent a coronary
angiogram which showed minor coronary artery disease,
followed by transthoracic echocardiography and cardiac
magnetic resonance imaging (MRI) (Figs. 2 and 3).
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