I am an engineer working on a project using ECGs. I am trying a few techniques and I was wondering whether the P-wave is still visible in the ECG after filtering it. The issue is that I believe the annotation I added on the image seems to be too close to the QRS to be a P-wave and the amplitude seems small.

Can someone confirm please (it is supposed to be sinus rhythm)?
Also, do you have any advise on identifying P-waves manually?

Thank you in advance.enter image description here

enter image description here enter image description here

  • That image isn't a normal ECG and there are no axis labels or timing marks, so the answer is kind of a shot in the dark. Judging by the width of the other waves, I'd say what you've circled is far too wide to be a P wave. That P wave would be as wide as the entire QRS.
    – Carey Gregory
    Nov 6, 2022 at 16:11
  • Hello, I will add a few more images to help. The ticks are not visible, I dont know why. The graph is divided to 0.2s (large rectangular areas) each sub-divided to 0.04s
    – makala
    Nov 6, 2022 at 21:55
  • Thank you, much better images. I think the P waves are pretty obvious in these recordings and I'm not a doctor, so have you attempted to discover how to identify a P wave? This site requires questions to demonstrate some degree of prior research.
    – Carey Gregory
    Nov 6, 2022 at 23:16
  • I have indicated the QRS complex with green dots and where I believe the P-wave starts and ends. From info I found the PR segment is 0.12s-0.2s long but the Pwave seems longer than the QRS wave.
    – makala
    Nov 6, 2022 at 23:32
  • Also, I have places the red horizontal line at 0 mV
    – makala
    Nov 6, 2022 at 23:43


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