title: Unusual signals in a halo catheter: what is the mechanism?
abstract: In this "featured arrhythmia" article we present a set of unusual intracardiac electrode tracings that were recorded in a patient with typical clockwise flutter but a very dilated right atrium. The potential mechanism underlying this phenomenon is discussed with reference to the current literature.
authors.affiliation: Division of Cardiology (Arrhythmia Service), Kingston General Hospital, Queen's University, Kingston, Ontario, Canada.
authors.forename: Jane
authors.initials: J
authors.lastname: Caldwell
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Miranda
authors.forename: Damian
authors.initials: D
authors.lastname: Redfearn
authors.forename: Adrian
authors.initials: A
authors.lastname: Baranchuk