Fusion beats

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List of terms related to Fusion beats

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: capture beat;

Overview

In some cases of VT with AV dissociation the SA node may transiently "capture" the ventricles, producing a capture beat, which has a normal QRS duration, or a fusion beat, in which the sinus and ventricular beats coincide to produce a hybrid complex.

Electrocardiogram

In the example below, "late" (end-diastolic) PVCs are illustrated with varying degrees of fusion with normal conduction. For a fusion beat to occur the sinus P wave must successfully make its way to the ventricles to start the activation sequence, but before ventricular activation is completed by the late PCV. The resulting QRS complex resembles both the normal QRS, as well as the PVC and hence the term fusion QRS or fusion beat. The fusion beats are marked by an F in the illustration below: