I have had a defib for over 2 years and counting. Make sure you know the maker of the device and check out their website. I am happy to tell you that I haven't gotten shocked :) But, if I do, it will be doing it's job. I had a 3 bypass w/2 v-fibs....no, I don't remember it. Whew! I have fibro which means I feel anything/everything in my body. But most people don't pay much attention to the implant. My defib gets checked every 3 months if that helps you. When they check it, I generally cough and get a bit sick in my stomach....again, that's me. It's much easier then getting your teeth cleaned to be honest. Takes about 10 minutes. What happens when you get shocked? Depends upon what your heart is doing. I stay away from power lines and engines when I am walking. Hope this helps to ease some fears. I am assuming your Dad had a heart attack...if not, device keeps me running even because my heart attacks.Post Edited (AnnieInOz) : 6/21/2007 5:26:57 PM (GMT-6)