Atypical chest pain in 17-year-old: What's the diagnosis?

Heart of the Matter: The answer hides in the genes for this teenager experiencing atypical chest pain.

A FIT, young, athletic 17-year-old complains of new onset intermittent atypical chest pain and presyncope.

There has been no exertional component to the chest discomfort. 

He has not had any syncope. 

There is no family history of cardiac disease. 

In particular, there are no family members with sudden unexpected death under the age of 50. 

He has a normal physical examination with no audible