This 46-year-old woman with well-managed hypertension presents to the family doctor with occasional palpitations, that she describes as a sensation of isolated “thumps” in her left anterior chest:

•  Sinus rhythm, 83/min with frequent premature junctional complexes
•  One premature ventricular complex or aberrantly-conducted premature supraventricular complex
•  Non-specific ST and T wave abnormality