Supraventricular arrhythmias Quiz: Ace Your Exams

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A 57-year-old male undergoes coronary artery bypass grafting due to severe symptomatic coronary artery disease. The surgery is uncomplicated, and the patient is admitted to the cardiothoracic intensive care unit for hemodynamic monitoring. Overnight, a rapid response is called after a tachyarrhythmia was noted on the patient’s telemetry strip. Temperature is 37.0°C (98.6°F), pulse is 140/min, respirations are 14/min, and blood pressure is 134/72 mmHg. He has incisional chest pain but is otherwise asymptomatic. The patient’s electrocardiogram is demonstrated below:  

A close-up view of an electrocardiogram (ECG) printout on red grid paper. It shows multiple rows of wavy lines representing heart activity across different leads.
Image reproduced from Wikimedia Commons  

Based on this patient's clinical presentation, which of the following is the most likely diagnosis?  

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