Karen Sandler of the Software Freedom Conservancy has a "pacemaker defibrillator" for her large heart, and has done a few talks about it. I just read that a defibrillator is not usually included as part of "pacemaker" so I may have misspoke.

Original talk: https://www.youtube.com/watch?v=5XDTQLa3NjE

Follow-up talk 6 years later: https://www.youtube.com/watch?v=k2FNqXhr4c8