ArticleJACC. Case reports2026
Narrow-QRS Ventricular Tachycardia Due to Microreentry After Iatrogenic Right Bundle Injury.
Article in JACC. Case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
1 citing paper in PubMed.
- Ventricular Arrhythmias: Mechanisms, Mimics, and Ablation.JACC. Case reports · 2026Article
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Authors and funding
7 authors.
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No grant is acknowledged in the PubMed record.
Abstract
backgroundVentricular tachycardia (VT) after ablation near the conduction system can present with a relatively narrow QRS complex and mimic supraventricular tachycardia (SVT), making diagnosis and management challenging. CASE SUMMARY: A 26-year-old man with 2 prior ablations for idiopathic premature ventricular complexes presented with incessant narrow-QRS tachycardia and left ventricular systolic dysfunction. Despite antiarrhythmic drugs and repeated cardioversion, the tachycardia persisted. Electrophysiologic study demonstrated ventriculoatrial dissociation, fixed His-His return intervals, and concealed fusion during atrial overdrive pacing. High-density mapping identified earliest activation at the mid-right bundle within a voltage border zone. Targeted radiofrequency ablation at this site terminated the VT and restored sinus rhythm, with complete recovery of ventricular function. DISCUSSION: This case illustrates an iatrogenic conduction system-related microreentrant VT masquerading as SVT, and it highlights the value of pacing maneuvers and high-density mapping for mechanistic diagnosis and precise ablation. TAKE-HOME MESSAGES: VT after prior right ventricular ablation may present with a narrow-QRS complex and mimic SVT. High-density mapping and pacing maneuvers can reveal an iatrogenic conduction system-related reentrant circuit and guide effective ablation.
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