Ashman aberrancy

An Ashman beat is a wide QRS complex with RBBB morphology during a supraventricular rhythm. The beat originates above the AV node but is not conducted normally through the ventricle. It classically occurs with a short RR interval (i.e. in atrial fibrillation) where the right bundle branch is still refractory from the beat before.

See also: BBB/Hemiblocks

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References

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