A 75-year-old woman presents to a general cardiology clinic for the first time. She has a history of atrial fibrillation, sick-sinus syndrome requiring a permanent pacemaker, hypertension, and dyslipidemia. She has no specific complaints other than shortness of breath on exertion. Her medications include aspirin (81 mg daily), carvedilol (25 mg twice daily), lisinopril (5…

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