EP Learning Library
High-quality, in-depth topic pages covering core electrophysiology — mechanism, ECG clues, EP study findings, ablation targets, and key references.
8 In-Depth Topics
Each topic covers the five pillars: mechanism → ECG clues → EP study findings → ablation targets → key references.
AVNRT
Atrioventricular nodal reentrant tachycardia — the most common paroxysmal SVT. Dual AV nodal physiology, slow-fast and atypical variants, Koch's triangle anatomy, and slow pathway ablation.
AVRT & WPW Syndrome
Accessory pathway-mediated tachycardia. Orthodromic vs. antidromic AVRT, delta wave localization using the Arruda algorithm, SPERRI risk stratification, and AP ablation by location.
Fascicular VT (Belhassen)
Idiopathic left ventricular tachycardia with a verapamil-sensitive Purkinje network circuit. RBBB + left-axis morphology, P1-P2 diastolic potentials, posterior vs. anterior variants, and mapping targets.
Bundle Branch Reentry VT
Macroreentrant VT using the right and left bundle branches as circuit limbs. Associated with dilated CMP and prolonged HV interval. His-precedes-V diagnostic sign and right bundle branch ablation.
VT Mapping Principles
Systematic electroanatomic approach to scar-based ventricular tachycardia. Activation, entrainment, and substrate mapping strategies — voltage criteria, LAVA targets, critical isthmus identification, and PPI-TCL.
Conduction System Pacing
Physiological pacing via His bundle (HBP) or left bundle branch area (LBBAP). Selective vs. non-selective capture, LVAT verification, implant technique, and clinical outcomes compared to conventional RV pacing.
LBBAP vs HBP vs BiV Pacing
Head-to-head comparison of the three resynchronization strategies. QRS morphology differences, threshold stability, COMPANION/CARE-HF evidence base, upgrade strategies, and which patients benefit from each modality.
PVC-Induced Cardiomyopathy
Reversible LV dysfunction from frequent PVCs. Burden thresholds, RVOT/LVOT/aortic cusp ECG localization, risk factors for PVC-CMP, EF recovery after ablation, and distinguishing PVC-CMP from coincidental DCM.
About This Library
Each topic page is written for cardiology fellows, practicing electrophysiologists, and advanced trainees. Content is based on peer-reviewed literature and reflects current clinical practice. These are educational resources and are not intended as clinical protocols — always apply individual clinical judgment. Full disclaimer →