Yep - thats the one and thats is exactly what an ectopic beat would look like. I was throwing loads of them, over and over. Its a horrible feeling and i couldn't get my head around it being an EXTRA beat. It felt like i missed a beat. What happens is this (im rusty on this) - The heart beats and then goes into a refactory stage (relaxed) before it beats again - this shows on the ecg. What happens when you have an ectopic (extra) beat, is the heart hasn't relaxed back properly before the next beat, so it doesn't beat properly, takes longer before it does the next beat - which is why you get such a horrible thuddy feeling.
Not sure i explained this very well, as it was a while ago. This is extremely common, the doctor said that everyone has these from time to time, but mostly we don't notice the odd one or two. They are apparently more noticable at night, especially just before going to sleep. I was having a whole episode when i pitched up at the doctors so it showed up big time on the ecg.
I had to have a 24 hour trace, which basically involved walking around with a cassette recorder strapped to me with ecg leads running from it. The nurse who fitted it said to me, "this is a miracle cure for palpitations" I was and she said, that no sooner to people get rigged up to one of those, their palpitations stop!! I was like, yeah yeah - pull the other one.
Well, she was right, sort of - my doctor rang me with the results, said that there were a couple of ectopics on the trace (i had to write down when i felt them too) but they were not concerned at all. As soon as i was told it was nothing to worry about, they stopped! It was only when i started taking the hayfever medication that they started up again and there was my culprit. Also, they are made worse by anxiety so the minute i stopped stressing about it, they went. I am triggered by night nurse too. I have had palpitations following drinking mega amounts of coffee and once when i was really badly hung over. Other than that, i don't notice anything.
Best part - back on the booze, coffee and chocolate!!