<unk> 's<unk>  is an aberrant intra-ventricular conduction abnormality that occurs because of variable cycle length in atrial fibrillation. It presents as isolated wide complex beats manifesting as a right bundle branch block morphology with short RR cycle length immediately following a longer RR cycle. It represents an aberrantly conducted complex that originates above the AV node, rather than a complex that originates in either the right or left ventricle.
In an emergency setting, this<unk>  can be easily confused with non-sustained ventricular tachycardia which also presents with a wide ORS complex. Misinterpretation of this finding can potentially result in unnecessary testing and health care costs.
Ashman phenomenon
Glagov phenomenon
Lazarus phenomenon
Wave sign
Hill sign
Brudzinski’s sign
Ashrafian sign
Palla's sign