Review Question - QID 210607

A 49-year-old woman presents to her primary care physician due to fatigue and shortness of breath. She finds herself being short of breath when climbing the stairs or walking uphill. Approximately 1 year ago, she was able to partake in long-distance running and weightlifting. 2 weeks ago she noticed blood-tinged sputum after severely coughing during sleep. She emigrated from Mexico to the United States 3 years ago. Her temperature is 98°F (36.7°C), blood pressure is 100/62 mmHg, pulse is 135/min and irregularly irregular, and respirations are 21/min. On physical exam her speech is hoarse. She has bilateral crackles heard in the lung bases. Which of the following will most likely be found on cardiac auscultation?