I know you guys are pre-surgery and I am not, however, I started having a weird sensation that I describe as a vibration in my left chest about a month and a half ago. It started out being only once or twice a week for a couple of seconds each time. I now have at least 30-40 of these everyday and they are lasting for longer periods of time. They don't feel like a "rhythm" thing, in fact, I've listened to my heart several times with a stethoscope when it is happening and nothing. So, long story short, I don't think you are imagining them, if you are, then I'm downright delusional by now.
I've spent the last couple of days searching everywhere trying to figure out what is causing this sensation. I finally broke down yesterday and sent my cardio at the Mayo an e-mail about it...if I hear back I'll let you know.
Kim