Most you already know that I had heart surgery. I went to the doctor's today and everything is alright for now. I have Primum ASD which is a valve leak in my heart. The problem is moderate for now but if it goes above that, then I will be needing surgery to have that valve replaced. My medication is now being doubled. I was taking 2.5 mg of lisinopril and now I will be taking 5 mg of lisinopril. My next visit is in May. If I should be needing surgery to have the valve replaced, (which I hope I don't) should I go with a cow valve or pig valve?