Supraventricular arrhythmias Quiz: Ace Your Exams

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A 27-year-old female is brought to the emergency department “to rule out a heart attack.” She was sitting in a college class when she experienced sudden tightness in the chest. The patient is otherwise healthy and takes oral contraceptive pills. Temperature is 37.0°C (98.6°F), pulse is 65/min, respirations are 22/min, and blood pressure is 110/71 mmHg. Physical exam is unremarkable, and electrocardiogram is demonstrated below:  

 A 12-lead ECG shows heart rhythm data. Top left details age 48, sex. Leads I, II, III, aVR, aVL, aVF, V1-V6 show normal QRS complexes with some T-wave variations.
Image reproduced from wikipedia    

Which of the following features of this electrocardiogram defines this patient's rhythm?  

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