Hi, My fiance just gone mad with me because I said an electric blanket may interfere with his heart monitor. I told him to late as he's already had the blanket on. But he did lay on top of the bed. I'm hoping god shows him that his temper is to quick, after the stroke he had he gets upset easier, I pray they get a good reading, I can't do with all this stress him getting mad, especially when I have his best health at heart.please pray it's OK the heart reading.