I just popped on to call it a (late ;) ) night and saw this. I wasn't aware your grandfather was having issues but excellent to hear it sounds like things are looking like they're much better and not worse.
I'll be the first to gripe (occasionally) about the state of modern medicine at times, but it really is an amazing day and age we live in that inserting a device, into the chest of a human being, which sends out pulses of magical charged particle energy and regulates one of the most important organs of our body, is a routine and easy thing!
I'm sure for now your grandfather will be fine and it's great to hear he's one that gets to enjoy an improvement after his hospital stay! So lots of "yay!" and postive thoughts your way!
Make sure to spoil him when he comes home. ;)
*EDIT I reread that, and slipped an extra "s" in a word where it didn't belong - embarrasssing ;)