title: Narrow QRS tachycardia with alternate wide QRS beats: what is the mechanism?
authors.affiliation: Department of Cardiac Arrhythmia Services, Escorts Heart Institute and Research Centre, New Delhi, India. drkartikeya@hotmail.com
authors.forename: Kartikeya
authors.initials: K
authors.lastname: Bhargava
authors.forename: Rajesh
authors.initials: R
authors.lastname: Jindal
authors.forename: Tarlochan S
authors.initials: TS
authors.lastname: Kler