Q. A 56-year-old man comes to the emergency department due to shortness of breath (dyspnea) at rest. The patient's medical history is significant for uncontrolled diabetes, hypertension, and recent myocardial infarction. Vital signs are BP: 150/100, HR: 134 bpm, respiratory rate: 25/min, and oxygen saturation: 85%. Chest auscultation reveals bilateral bubbling coarse crepitations. His recent echocardiography shows an ejection fraction of 30%. Which of the following best explains the auscultatory findings in this patient?