Pathophysiology
         
Fusion of paced and normal beat      

A pacemaker fusion beat occurs when the intrinsic beat and pacemaker stimulus beat partly depolarize the ventricles, causing a hybrid QRS complex.

Rhythm Strip
Fusion of paced and normal beat Rhythm Strip

VEB Followed by Ventricular Pace Beat, followed by a Pacemaker fusion Beat

12 Lead EKG
Fusion of paced and normal beat 12 Lead EKG