title: Sudden shortening of the paced AV delay: is this normal pacemaker function?
authors.affiliation: St. Michael's Hospital and University of Toronto, 30 Bond Street, M5B 1W8, Toronto, ON, Canada, pintera@smh.ca.
authors.forename: Arnold
authors.initials: A
authors.lastname: Pinter
authors.forename: Paul
authors.initials: P
authors.lastname: Dorian