Pseudofusion beatPseudofusion beat

Fusion beat= ventricles are activated partially Fusion beat= ventricles are activated partially by spontaneous depolarization and a paced by spontaneous depolarization and a paced impulse,impulse,

FB is often narrower than pure paced beat,FB is often narrower than pure paced beat, Pseudofusion beat = superimposition of an Pseudofusion beat = superimposition of an

ineffectual pacemaker spike on the ineffectual pacemaker spike on the spontaneous QRS complexspontaneous QRS complex