AKT-0172

AKT-0172

A previously healthy 38-year-old woman is 20 weeks pregnant with her first child. She has been experiencing increasing shortness of breath in recent weeks and has started coughing up pink frothy sputum, particularly when lying down. She reports no chest pain. Blood tests reveal no anemia, but upon listening to her chest, you detect a mid-diastolic heart murmur at the apex. Her chest exam is otherwise normal, and her resting pulse is 90 bpm SR with O2 sats at 96%. What is the most probable diagnosis?