Symptoms he has are result of ventricular hypertrophy he had developed over years.
Aortic valve stenosis and aortic valve regurgitation are factors that made his heart working harder and resulted in enlargement (hypertrophy) of the muscle tissue that makes up the wall of the heart's main pumping chamber (left ventricle).
Shortness of breath, chest pain, sensation of rapid, fluttering or pounding heartbeats, dizziness, fainting, rapid exhaustion with physical activity, are symptoms of ventricular hypertrophy.
Replacing valves and controlling hypertension are main treatment options.
He needs to watch for his diet, too.
Sometimes, blood vessels of the heart are checked for atherosclerotic changes (to see if the blood vessels are narrowed or blocked).
Regular heart monitoring is important since this condition can lead to sudden heart failure.

Best wishes!
Marija