mitral regurgitation

A 63-year-old male presents to the ED complaining of sudden onset shortness of breath for the past 2 hours. He has a history of CAD, HTN, and T2DM He states that he has been compliant with his medications. BP 97/68, HR 108, RR 21, 92% RA. Physical exam is notable for a holosystolic murmur most prominent over the apex and radiating to the axilla, mild bibasilar rales, JVD, and 2+ lower extremity pitting edema. What is the most likely cause of this patient’s symptoms and what are the next steps in management?