88 yo M evaluated for chest tightness and dyspnea. Echocardiogram shows severe aortic stenosis with a mean gradient of 62 and an aortic valve area of 0.65 cm squares. Cardiac surgery assessment estimates the surgical risk to be high.What is the most likely diagnosis for the patient described?
a) Coronary artery disease
b) Atrial fibrillation
c) Severe aortic stenosis
d) Pulmonary embolism
