Thank you so much! We will look into this.
The Ejection Fraction is an estimation and is a good level shown. Perhaps the Doctor should look more into his Pectus excavatum. Perhaps a lung function test and stress test to evaluate if his chest is inhibiting the lungs or heart in any way when being worked. It is rare, but when this condition is severe enough, it can produce fatigue, shortness of breath, tachycardia, chest pains. Seems like a good starting point.