Welcome to HCM,
Every investigation should always be correlated clinically,it is important to know your age,and clinical history of angina.
One should also looks into the risk profile like Hypertension
,Lipids and Smoking etc.
This indicate reduction of blood supply to heart in area of one of the coronary artery.
We would like to get a Coronary angiography
to know exact status of arteries and depending on result you may be required to revascularization procedure like angioplasty
or by pass surgery.
This is good that you have good left ventricular function.
In the mean time continue treatment advised by your physician.
Best of Luck