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A young adult presented with a short history of subacute dyspnoea and dizziness. He had a sore throat and a rash 4 days before the onset of his current complaints, but this illness receded after a course of penicillin. Arthritis was absent, and there was no history of recent foreign travel or zoonosis. Bradycardia (46 beats per minute) was the main physical finding. His serum electrolytes, troponin, inflammatory markers, thyroid function, throat swab and chest X-ray were all normal or negative. His ECG, echocardiogram and cardiac CT scan are shown in figure 1A–C. (see also online supplementary video 1 …
Contributors All authors contributed to the conceptualisation, preparation and review of the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Patient consent for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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