Scenario: A 48-year-old man arrived at the emergency department with complaints of palpitations, mild shortness of breath, and lightheadedness lasting 15 to 20 minutes. On arrival, his symptoms had resolved. The patient had a history of hypertension and type 2 diabetes, and he had undergone surgical aortic valve replacement (SAVR) 3 weeks earlier but was otherwise healthy and had no known history of coronary artery disease. During physical examination, his pulse was regular, heart rate was 79/min, blood pressure was 140/85 mm Hg, and oxygen saturation was 98% on room air. A standard 12-lead electrocardiogram (ECG) showed normal sinus rhythm. Concerned about transient arrhythmias, the triage nurse applied a new 12-lead ECG patch device for continuous cardiac monitoring while the patient awaited admission. The new device alerted the nurse that the patient’s heart rate had exceeded the preset alarm limit, and the 12-lead ECG shown here was automatically captured...

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