A middle-aged patient presents for her annual physical examination in seemingly good health. She has a blood pressure of 128/83 mm Hg, and echocardiography indicates that end-diastolic volume is 140 mL and end systolic volume is 80 mL. A routine ECG is obtained and is shown below. The ECG reveals the patient is in normal sinus rhythm with an R-R interva of 0.76 seconds. This corresponds to a heart rate of: 70 beats/min 74 beats/min 79 beats/min 84 beats/min 88 beats/min

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