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Sinus rhythm changing to accelerated idioventricular rhythm.  In lead II there appear to be some retrograde P waves that are following the QRS complexes.   

Sinus rhythm changing to accelerated idioventricular rhythm (AIVR).  The second page is a continuation of the first page.   

The initial beat is a sinus beat then the rhythm changes to an accelerated idioventricular rhythm.   

This page also shows a sinus rhythm changing to an accelerated idioventricular rhythm.  Notice the very short PR interval on the initial complexes of the AIVR.  The QRS complexes look like they have a delta wave configuration too.

This page shows a patient in sinus rhythm that converts to an accelerated idioventricular rhythm.

This patient was initially in sinus rhythm but converted to an accelerated idioventricular rhythm.

Various Accelerated Idioventricular Rhythms 1. Accelerated Idioventricular Rhythm 2. Atrial fibrillation with run of accelerated idioventricular rhythm 3. Accelerated idioventricular rhythm 4. Accelerated idioventricular rhythm 5. Accelerated idioventricular rhythm 6.