title: Narrow complex tachycardia with alternating cycle length: what is the mechanism?
authors.affiliation: Imperial College Healthcare NHS Trust, St Mary's Hospital, London, UK. pblim@imperial.ac.uk
authors.forename: Phang Boon
authors.initials: PB
authors.lastname: Lim
authors.forename: Ian J
authors.initials: IJ
authors.lastname: Wright
authors.forename: Tushar V
authors.initials: TV
authors.lastname: Salukhe
authors.forename: David C
authors.initials: DC
authors.lastname: Lefroy
mesh_terms: D004562:Electrocardiography; D005260:Female; D006801:Humans; D008875:Middle Aged; D013610:Tachycardia / Q000175:diagnosis / Q000503:physiopathology*