Was a few weeks ago I had an ECG done by a paramedic and he explained there was a slight curve in my R-Wave but because it was only small he wasn't concerned and said he didn't want to mention it,he pointed it out because I asked if he could see anything "slightly abnormal" he said if it was bigger then thats when to worry. I've had several since and an echocardiogram and all have been normal,I've no history of heart problems,it's been on mind since and I'm constantly thinking about it. Does anyone know what could cause this??