Dear Al,
Unfortunately just being a male in your 50's puts you at increased risk for having coronary heart disease. However, this does not mean that you have clinical heart disease (that is needing treatment). But it is routine practice to get an angiogram prior to valve surgery. This way if there are any blockages they can bypass them "while they're under the hood". After all you wouldn't want to find out you needed bypass surgery shortly after undergoing valve surgery!