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An 80-year-old woman with no known cardiovascular risk factors was found unconscious at home with a body temperature < 30°C (< 86°F). On arriving at the emergency department, her ECG (panel A) showed an atrial fibrillation (AF) with ST segment depression from V3 to V6. In leads V5 and V6 there was a terminal extra QRS deflection formed by the junction between the J point and the ST segment, consistent with the so-called …