Q. A 56-year-old man comes to the clinic for regular follow-up. He currently has no complaints except mild dyspnea on exertion. The patient's past medical history is significant for hypertension and chronic liver disease. His vital signs are blood pressure 155/100 mm Hg, heart rate 82/min, respiratory rate 12/min. Cardiac examination reveals a late diastolic additional heart sound. Which of the following hemodynamic variables is expected to be UNCHANGED in this patient?