Fusion beats and Nonconducted PACs

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On this page there are a variety of complexes present.  The first complex shows a prolonged PR interval.  The 2nd and 3rd complexes are PVCs with P waves or fusion complexes.  On the 3rd complex there is a dropped P wave.  It can be seen in lead aVR and aVL.  This is followed by a short pause.  The 4th complex shows a prolonged PR interval and it is followed by another nonconducted P wave.  A short pause follows the nonconducted P wave, then sinus bradycardia with sinus arrhythmia follows. 


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