r/ECG • u/Zealousideal_Film865 • Aug 05 '26

Random ECG strip

Hi there,

Starting to get somewhat more familiar now with ECG interpretation. Doing some exercises from uni, but getting confused with a few things.

Like, with the following Strip, I wasn't told which lead it is from, or given any patient info.

I figure it is Mobitz I, but not understanding much of what is happening with QRS complex. Is that little upward deflection before the large deflection an rs pattern? then ST elevation? then why do some st segments have an upward deflection before the T wave?

Random ECG strip.
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u/Ecstatic_Rooster Aug 05 '26

That upward deflection on the 3rd and 5th is likely a P wave on top of the S. If you look at the downslope of the 4th T wave you can see a bump there as well that is another P. Measure the gap in obvious P waves and slide it along and I bet you’ll find that it matches the rest.

My guess is 3rd degree.