question: I have a history of a heart attack 8 yrs ago, with a stent placed in left artery.  Today I'm experienceing very slight vibrations in the left side of my chest.  No Pain. No weakness. No dizziness. I feel fine with plenty of energy.  The vibrations come every 4 or 5 minutes and last only 2 or 3 seconds.    Any ideas.   Thank you.John G. Miller