What Causes Shortness Of Breath With Normal Cardiac Test Reports?

My question is, What do you know about Lipid Clinic Labs that test blood for heart disease risk and what in that person s blood may cause them to build plaque . i.e.; genetics, sugars, cholesterol, etc. (www.rhlinc.com; www.4myheart.com). My husband recently had an MI - and underwent emergency open heart 6 bypass surgery. He had no pre-markers for being at risk for Heart Disease. He is 57. No high blood pressure, no high cholesterol, not diabetic, never smoked, not a drinker, no family history of heart disease, our diet for the past several years has been predominately poultry, with salads, veggies, eggs/oatmeal (for breakfast), we typically eat out 1 meal a week and make it a taco / chicken Cesar salad, he is approx. 10 - 15 lbs overweight. He has been healthy and active. Yet, one morning, after a 20 minute cardio workout, he had sudden onset of shortness of breath and within 8 hours was in surgery. We are interested in this lab work to see if we can pinpoint what HIS particular cause / risk factors are. Taking a statin is fine... but not if it really isn t going to help HIM. Changing his diet to low fat, low sodium is fine. We can do that too. But what if HIS risk is really in SUGAR??? It s just hard to be committed to a change if we don t know it is TRULY what HE needs. Curious if you have any insight about this type of clinical labs and their results.