A 40-year-old man, who had collapsed while running and was resuscitated successfully by bystanders, was referred. An automated external defibrillator had shown ventricular fibrillation before a single shock restored sinus rhythm. On arrival, the patient was alert and haemo-dynamically stable. He reported that he had recently suffered from chest pain during exercise but had not visited his general practitioner; before collapsing he had no complaints. Physical examination showed a moderately tender abdomen with normal peristalsis.
