<unk>  beats are described as wide complex QRS complexes that follow a short R-R interval preceded by a long R-R interval. This short QRS complex typically has a right bundle branch block morphology and represents an aberrantly conducted complex that originates above the AV node, rather than a complex that originates in either the right or left ventricle.
Ashman phenomenon
Dawn phenomenon
Tullio phenomenon
Marcus Gunn phenomenon
Azzopardi phenomenon
Renbök phenomenon
Bell's phenomenon
Shwartzman phenomenon