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Is this an artifact or an arrhythmia?

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    $\begingroup$ What animal is this recording from? What is the nature of the recording? Where was the electrode placed? Did the animal move during the recording? Etc. I think we need more information. $\endgroup$ – kmm Jul 25 '19 at 10:48
  • $\begingroup$ There is also a Medical Science Stack Exchange site, I think that after you collect more information to address the questions in the comment above, you might consider asking there. But be sure to supply a lot more information than this. $\endgroup$ – uhoh Jul 25 '19 at 14:22
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To be conclusive, another couple of leads recorded at the same time as this event would be helpful though the fact that you do have a recognisable QRS complex and a T wave and that the QRS happens before you would expect it to based on the prior rhythm and the P wave, if that is one, prior to it is to close to the QRS complex to have caused it would suggest a premature supraventricular arrhythmia. There are many technical texts to consult to refine this further, if this is a small animal ECG, I recommend Larry Tilley's textbook entitled ECG for the small animal practitioner.

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