Review Question - QID 215198

A 78-year-old woman presents to her primary care doctor reporting several months of shortness of breath on exertion. She finally decided to see a doctor because she had a syncopal episode while gardening yesterday. Her past medical history is notable for hypertension and hyperlipidemia, both well-controlled on atorvastatin and losartan. Her temperature is 36.9°C (98.4°F), blood pressure is 132/83 mmHg, pulse is 94/min, respirations are 18/min, and oxygen saturation is 96% on room air. On auscultation, there is a systolic murmur best heard at the upper right sternal border, as well as a soft single S2. Which of the following is the most appropriate next step in management?