Weird that you asked this question. My Dad had one 10 years ago. I guess they are only good for ten years (then you have to have another). This morning, he called me because he was having “tightness in his chest”. I flew home from work. I got my sister on the phone (she’s an R.N.) and she told him to go up to the hospital, but, he refused. He rested for 2 hours and I stayed with him. It scared the crap out of all of us. He’s feeling better now, but, we are all concerned. He’s stubborn and I feel that he should be checked out. Sorry, I don’t know anything about the surgery.