I've been having Heart Palpitations for about 2 Weeks Now. I had an ECG at A&E on Monday and he said it was Normal but I had A Short PR Interval of 118. I had My Second ECG Yesterday On Thursday and it came back Normal with a Normal PR Interval of 140. Can it Change that quickly? I had to have The Second ECG done Twice because The First Time I Moved and The Sticker Came Off. I think The Sticker wasn't Stuck on properly when I did it again but My GP said if the Chest Sticker wasn't on The Line on The ECG wouldn't come up. I'm So Scared I have Hypertrophic Cardiomyopathy. I know The ECG can come back as Abnormal when it isn't done properly when it would be Normal but can it come out Normal when it would be Abnormal? Surely if I had something Wrong it wouldn't be able to come out as Normal or not?