Heart Flutter Question

Three weeks ago, I had a heart attack (clot in a stent). Luckily, I had help fast enough, the clot was removed and another stent added.

For about a day or so, my heartbeat would shoot up to 145 for a few seconds. I also had some irregular beats that went away after three days. I'm on amiodarone.

My heartbeat is back to normal; I'm wearing a heart rate monitor, and it's reading 48-52 beats per minute when I'm resting, which is what it was before my heart attack. As per my cardiologist, I'm taking it easy. I feel fine. I am exercising - walking, riding my bike - and keeping my heart rate down, at least for the next few weeks.

However, for perhaps the past 24 hours, I've noticed what feels like a slight fluttering in the upper left portion of my chest. The feeling comes and goes, and it seems to be coming more frequently, every few minutes, and it lasts 20 seconds or so. I was in cardiac rehabilitation yesterday, hooked up to a monitor, and the person monitoring me didn't say she saw anything amiss. However, I'm not sure I experienced the flutter while I was hooked up. Frankly, I'm not sure I'm not imagining this.

Should I be worried about this?

Do they happen when you exercise?? Heart arrythmias are quite common after intervention for CAD. I have had them for two years before and intervention, and I have had two heart attacks where the flutters have got worse since. I have now increased my beta blocker which has slowed them a lot, and they are manageable, but then your RHR can also drop ( mine is now 48).
If you notice them when you exercise, make sure you do some exercise when you get your holter monitor.
Good luck