Fusion Beats

Fusion beats due to VT - the first of the narrower complexes is a fusion beat (the next two are capture beats)


  • A fusion beat occurs when a supraventricular and a ventricular impulse coincide to produce a hybrid complex.
  • It indicates that there are two foci of pacemaker cells firing simultaneously: a supraventricular pacemaker (e.g. the sinus node) and a competing ventricular pacemaker (source of ventricular ectopics).
  • The fusion beats are of intermediate width and morphology to the supraventricular and ventricular complexes.


Fusion beats are seen with:

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Further Reading

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