title: Superior vena cava rhythm masquerading as normal sinus rhythm.
abstract: We report the case of a patient with persistent cardiac rhythm originating from the superior vena cava (3 cm above the vena cava-atrial junction). It was detected by noncontact balloon mapping before induction of tachycardia and confirmed by conventional contact mapping with image studies. Thus, a 12-lead ECG showing normal morphologies of P waves may not indicate that the P waves are of sinus node origin.
authors.affiliation: Division of Cardiology, Department of Medicine, National Yang-Ming University, School of Medicine, and Taipei Veterans General Hospital, Taipei, Taiwan.
authors.forename: Yoga
authors.initials: Y
authors.lastname: Yuniadi
authors.forename: Ching-Tai
authors.initials: CT
authors.lastname: Tai
authors.forename: Yenn-Jang
authors.initials: YJ
authors.lastname: Lin
authors.forename: Shih-Ann
authors.initials: SA
authors.lastname: Chen
mesh_terms: D003937:Diagnosis, Differential; D005260:Female; D006329:Heart Conduction System / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D012849:Sinoatrial Node / Q000502:physiology* / Q000503:physiopathology*; D014683:Vena Cava, Superior / Q000002:abnormalities* / Q000503:physiopathology*