Abstract
ECG Challenge: A 59-year-old woman has a history of lupus with renal involvement for which she is taking glucocorticoids. She has no known heart disease. She presents to her rheumatologist with concerns of intermittent palpitations that first began ≈1 month ago. She was referred to a cardiologist and an ECG was obtained. The ECG shows a regular rhythm with 2 different rates. The initial portion of the ECG shows a regular rhythm with a rate of 72 bpm. The second part of the ECG shows a regular rhythm at a rate of 160 bpm. All the QRS complexes (except for the 8th QRS complex; ↓) have the same morphology. The QRS complex duration is normal (0.08 s), and there is a normal morphology and a normal axis between 0° and +90° (positive QRS complex in leads I and aVF). The …
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