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This case discusses the differentiating narrow QRS tachycardia

This case discusses entrainment with concealed fusion of a ventricular tachycardia

This case discusses substrate modification for post-myocardial infarction ventricular tachycardia

This case shows exit block from an isolated left superior pulmonary vein

This case asks: where do these VPBs come from?

This case examines differentiating left atrial appendage and left superior pulmonary vein potentials

The case examines mid-diastolic potentials during ventricular tachycardia recorded from the coronary sinus

This case considers far-field superior vena cava potentials recorded from the right superior pulmonary vein

This case presents information on the radiological anatomy of slow pathway ablation

This case discusses ablation-resistant premature ventricular complexes

This case asks: perimitral flutter, or is it?

This case examines bipolar electrogram morphology

This case presents entrainment of orthodromic atrioventricular re-entrant tachycardia by right ventricular pacing in the presence of left bundle branch block

This case looks at residual bidirectional conduction

This case examines infra-Hisian complete atrioventricular block with ventriculoatrial conduction

This case looks closely at ventricular premature beats

This case examines the interruption of supraventricular tachycardia by a ventricular premature beat

This case looks at sinus rhythm with dual nodal response

This case discuss entry block during atrial fibrillation

This is one of two cases on ventricular overdrive pacing during supraventricular tachycardia/1

This is another case that considers atrial tachycardia

This case looks at isolation of the left superior pulmonary vein

This case examines differentiating atrioventricular nodal re-entrant tachycardia subforms

This case describes late potentials with decremental conduction in post-myocardial infarction scar

This case presents pulmonary vein exit block testing with residual conduction

This case considers 2:1 block during supraventricular tachycardia

The case considers ventricular tachycardia with alternating cycle lengths

This case discusses interpreting entrainment during ventricular tachycardia

Background— Pulmonary vein reconnection (PVR) still determines recurrences of atrial fibrillation after contact force (CF)–guided pulmonary vein isolation. We studied whether acute PVR (adenosine and waiting time) and late PVR (at repeat) are explained by incomplete transmurality and contiguity within the deployed radiofrequency circle. Methods and Results— We analyzed 42 CF-guided ipsilateral pulmonary vein isolation procedures. For each radiofrequency tag within the circle, we collected data reflecting lesion depth (time of application, power, impedance drop [Δ-Imp], CF, force–time integral [FTI], and ablation index [AI]) and contiguity (automated interlesion distance [ILD]). Ablation line contiguity index (ALCI) was developed as a novel automated algorithm combining depth and contiguity into one single criterion. Each circle was subdivided into 10 segments. For each segment, we determined its weakest link by annotating time min , power min , Δ-Imp min , CF min , FTI min , AI min , ILD max , and ALCI min . Compared with segments without PVR (n=758), PVR segments (n=44) were characterized by lower Δ-Imp min (4.8 versus 7.4 Ω), CF min (8.5 versus 11.8 g), FTI min (351 versus 473 gs), AI min (367 versus 408 arbitrary unit [au]), and higher ILD max (6.8 versus 5.5 mm). ALCI min was significantly lower in segments with PVR (74% versus 104%; P Conclusions— In CF-guided pulmonary vein isolation, PVR is explained by lack of both lesion depth and contiguity within the deployed radiofrequency circle. ALCI, a novel measure combining contiguity and depth, is the most accurate predictor for durable segments. By avoiding weak links in the ablation chain, ALCI-guided ablation is expected to improve success rate of point-by-point radiofrequency ablation.

This case discuss electrograms during accessory pathway ablation

This case presents atrioventricular conduction during incremental pacing

This case looks at dormant conduction requiring additional ablation

This case considers an unusual supraventricular tachycardia induction sequence

This case looks at ‘late’ far-field from the left atrial appendage

This cases discusses orthodromic atrioventricular re-entrant tachycardia using dual anterograde nodal conduction

This case looks at pre-excitation

This case considers bundle branch re-entrant ventricular tachycardia

This case present double fire tachycardia

This case considers slow-conducting right-sided bypass tract

This case considers the impact of interruption of a supraventricular tachycardia by a ventricular overdrive pacing manoeuvre

This case looks at pacing to validate block over an ablation line

This case discusses azygos continuation of an interrupted inferior vena cava

This case asks where we are within the ventricular tachycardia circuit

This cases discusses unipolar electrogram morphology

This case considers entrainment pacing during supraventricular tachycardia

This case considers ventricular tachycardia from the proximal His–Purkinje system

This case considers pacing manoeuvre during ventricular tachycardia

This case discusses activation recovery interval

This case considers how catheter bumps can teach us something

This case examines fascicular ventricular tachycardia