Related Experiment Video
Updated: Dec 24, 2025

Cox-Maze IV Procedure Concomitant with Valvular Surgery In Situs Inversus Dextrocardia: A Single-Center Experience in China
Published on: February 11, 2022
The various manifestations of concealed nodofascicular/nodoventricular bypass tracts
Reginald T Ho1, Matthew Ortman2, Steven A Levi3
1Division of Cardiology, Department of Medicine, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania.
Background:
The various arrhythmic manifestations of concealed nodofascicular (NF)/nodoventricular (NV) bypass tracts (BPTs) are poorly understood.
Objective:
The purpose of the study was to define diagnostic criteria for supraventricular tachycardias (SVTs) associated with concealed nodal pathways (NPs).
Methods:
We reviewed 11 patients with concealed NPs who underwent electrophysiology study and ablation for symptomatic SVT.
Results:
Of 11 patients 7 (64% women; mean age 54 ± 16 years), NF/NV BPTs were active bystanders during atrioventricular nodal reentrant tachycardia (atypical [n = 4]; typical [n =2]) or participants during orthodromic NF/NV reentrant tachycardia (n = 5). The majority (10 of 11 [91%]) had nodal origin in the slow pathway (SP) and 7 of 11 (64%) presented as long RP SVT. Ablation of the SP targeting the right (n = 10) or left (n = 1) inferior extension eliminated concealed NP-associated SVTs in all patients.
Conclusion:
Concealed NF/NV BPTs are active bystanders equally as common as participants during SVT. They typically insert into the SP and often present as long RP SVT. SP ablation eliminates concealed NF/NV BPT-associated SVTs regardless of the mechanism.
More Related Videos
12:45Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
Published on: December 11, 2017
07:41Echocardiographic Evaluation of Atrial Communications before Transcatheter Closure
Published on: February 8, 2022
Related Concept Videos
Coronary Artery Disease III: Clinical Manifestations
Heart Failure III: Clinical Manifestations
Mitral Stenosis II: Clinical features and Diagnostic Tests
Mitral Stenosis I: Introduction
Dysrhythmias IV: Characteristics of Bradyarrhythmias
Aortic Regurgitation II: Clinical Features and Diagnostic Tests