Can wpw syndrome considered to be a type of heart disease?

Sort of: It is a heart condition. The term 'heart disease' is an umbrella/basket term that is used broadly, i think you need to carefully consider the context of the situation.

Rhythm disturbance: Wpw (short pr interval) is an electrical disturbance that can lead to fatal rhythm distubances under certain conditions. You should mention it to mds, rns, athletic coaches, etc. So that you don't get meds that might aggravate the problem.