Atrial tachycardia with slow pathway conduction mimicking typical atrioventricular nodal reentrant tachycardia.
A 68-year-old woman with palpitations underwent electrophysiologic testing. During burst atrial pacing the PR interval exceeded the RR interval and induced a supraventricular tachycardia consistent with a typical AV nodal reentrant tachycardia (AVNRT). Radiofrequency ablation of the slow pathway during the tachycardia immediately produced 2 : 1 AV conduction. After slow AV nodal pathway ablation an atrial tachycardia (AT) remained inducible with the earliest atrial activation around the HB region. Radiofrequency ablation at the site of earliest atrial activation interrupted the AT without AV block. AT originating from the HB region with slow pathway conduction may mimic typical AVNRT.
Yamada
Takumi
T
Division of Cardiovascular Diseases, Cardiac Rhythm Management Laboratory, University of Alabama at Birmingham, VH B147, 1670 University Boulevard, 1530 3rd AVE S, Birmingham, AL 35294-0019, USA. takumi-y@fb4.so-net.ne.jp
Huizar
Jose F
JF
McElderry
Hugh T
HT
Kay
G Neal
GN
D000368:Aged; D017115:Catheter Ablation; D003937:Diagnosis, Differential; D004562:Electrocardiography; D004594:Electrophysiology; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis* / Q000503:physiopathology; D013612:Tachycardia, Ectopic Atrial / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery