I experience the vibration sensation in my chest, but mine is on the right side. I reach for and pull out my cell to find that there is no incoming call. I was thinking that it's all in my head, but I read where others have this happen. The only difference is mine is on the right side. I had a valve replacement but anything involving the heart should be the left side. I'm going to see my doctor on the 3rd and will ask, I'm not due to see my cardiologist for a few more months. My last checkup was excellent. That was barely a month and a half ago.