A 40-year-old restaurant manager is being seen by a cardiologist for progressive shortness of breath and lower extremity edema. On physical examination, blood pressure is 120/80 mmHg, jugular venous distension is 10 cm above the sternal angle with prominent a waves, the heart rhythm is regular, a right ventricular heave is present, and a loud P2 component of the second heart sound. What is the most likely diagnosis? Aortic regurgitation. Atrial fibrillation. Aortic stenosis. Atrial flutter. Pulmonary hypertension.