Absolutely! I was a competitive runner, marathoner, good cholesterol numbers, no family history, ate very well, never smoked etc, resting HR in mid 40's. I had a heart murmur which was caused by mitral valve pro lapse. The thinking at the time, late 90's was to just keep an eye on it. then in early 2000's the thinking changed and if the pro lapse was moderate or severe a surgical repair was suggested. Before doing surgery I had an angiogram and they found two arteries blocked 80% and three at 50%. The LAD was one of the 80% blocked vessels. I never had shortness of breath, blood pressure 110/70 so you certainly can be asymptomatic.