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Tachycardia of unknown Origin

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This is the first published case of onset of tachycardia despite triple rate-controlling medication during a rugby league match. The case highlights the importance of a thorough history to exclude Origin-induced tachycardia.

Clinical record

A 40-year-old Queensland man on continuous telemetry for decompensated idiopathic dilated cardiomyopathy following explantation of an infected implantable cardiodefibrillator was noted to have abnormal tracing (Box) between 19:00 and 22:00 on 4 July 2012. The patient was well, symptom-free and in excellent spirits. His medication included digoxin 250 μg daily, amiodarone 200 mg daily and bisoprolol 7.5 mg daily, with a resting heart rate of 60 beats per minute.

Telemetry showed asymptomatic variable persistent sinus tachycardia over a 3-hour period on the previous evening.

Further history revealed that the patient had been watching the deciding match of the annual State of Origin rugby league series between Queensland and New South Wales on television. The Box shows the onset of the tachycardia at the start of the match coverage at 19:00, with a second peak at kick-off (20:15). The recorded rhythm was sinus with left bundle branch block (QRS duration, 140 ms). The sinus tachycardia persisted throughout…