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An 86-year-old woman with a known history of coronary artery disease and a prior percutaneous coronary intervention presented to the emergency department with several episodes of self-resolving chest discomfort occurring at rest. She denied any shortness of breath, palpitations, and diaphoresis. Her home medications included a β-blocker. Her blood pressure was 140/85 mm Hg, and she had an irregular heart rate of 125/min. Figure 1 shows the initial electrocardiogram (ECG) obtained in the emergency department.
Argulian E, Bader E, Chavez P, Aziz EF. Irregular Supraventricular Tachycardia. JAMA Intern Med. 2013;173(21):2001-2003. doi:10.1001/jamainternmed.2013.10068