NSR changing to SVT

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In this page the patient is in sinus rhythm.  Then a PVC occurs on the 5th complex and it induces a run of an atrial ectopic rhythm.  The width and morphology of the QRS complexes do not change, so I think that it is supraventricular.  In leads I and II, it looks like there are some occasional P waves that look different from the sinus P waves. 


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