title: An unusual tachycardia.
abstract: The following article presents an unusual case of atrial tachycardia, initially misdiagnosed due to a lack of clear P waves. The diagnosis was eventually confirmed using the atrial electrogram from the patient's pacemaker.
authors.affiliation: Division of Cardiology of Beth Israel Medical Center, University Hospital and Manhattan Campus for the Albert Einstein College of Medicine New York, NY 10003, USA. shanon@bethisraelny.org
authors.forename: Sam
authors.initials: S
authors.lastname: Hanon
authors.forename: Michael
authors.initials: M
authors.lastname: Shapiro
authors.forename: Paul
authors.initials: P
authors.lastname: Schweitzer