I sometimes get ectopics and other disturbances after spending long periods of time typing with my fingers directly on my "laptop" and with it on my lap. Most times, my laptop sits on my desk and I use a separate keyboard, but sometimes I sit in front of the TV and type directly onto the laptop. My ECG readings using AliveCor tend to show interference after close and prolonged exposure to my laptop, even when my pulse feels steady. The accompanying image shows a typical AliveCor reading under normal circumstances (at home, top panel), and after using my laptop (lower panel, my computer was no where near the device while the reading was taken). The second reading shows too much interference to be interpretable (at least by AliveCor). I don't think this would happen every time, but I do sense that over-exposure to the electromagnetic fields of laptops could have some effect. I wonder if anyone else has experienced issues with laptops and ECG interference, and whether there have been discussions of the risks of prolonged electromagnetic field exposure and AF.