Postpacing interval is shorter than tachycardia cycle length—What's the mechanism?. Issue 2 (1st February 2021)

• Record Type: Journal Article
• Authors: Manickavasagam, Anand; Nair, Krishnakumar; Patloori, Sirish Chandra Srinath; Chase, David; Roshan, John
• Is Part Of: Journal of arrhythmia. Volume 37:Issue 2(2021)
• Page Start: 455
• Page End: 457
• Publication Date: 2021-02-01
• Subjects: ablation -- atrial flutter -- entrainment -- narrow isthmus -- PPI‐TCL; Arrhythmia -- Periodicals; Cardiac pacing -- Periodicals; Arrhythmias, Cardiac; Arrhythmia; Cardiac pacing; Periodicals; Electronic journals; Periodicals; 616.128
• DOI: 10.1002/joa3.12514
• Languages: English
• ISSNs: 1880-4276

Abstract

Abstract : A 33‐year‐old male who underwent surgery for Tetralogy of Fallot presented with atrial flutter. Electrophysiology study revealed concealed entrainment along the mid lateral right atrium with postpacing interval shorter than the tachycardia cycle length. Ablation at this site terminated the tachycardia. The presence of shorter PPI than TCL was due to a large virtual electrode leading to downstream capture of far field tissue. This case demonstrates that sites showing PPI shorter than TCL are in a slow conducting narrow critical isthmus and hence constitute good ablation targets.