What question did this study set out to answer?

To identify the electrophysiological mechanisms and conduction changes responsible for successful radiofrequency modification of the atrioventricular junction in patients with drug-refractory paroxysmal atrial fibrillation.

May 1, 1996Circulation

Electrophysiological Mechanisms in Successful Radiofrequency Catheter Modification of Atrioventricular Junction for Patients With Medically Refractory Paroxysmal Atrial Fibrillation

Q: What is the clinical evidence from this study?

Study design: Cohort. Population: Medically refractory paroxysmal atrial fibrillation (n=50). Intervention: Radiofrequency catheter modification of the right midseptal and posteroseptal areas. Primary outcome: Successful modification.

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Key result

Radiofrequency modification of the right midseptal and posteroseptal areas was feasible and successful in 92% of patients with medically refractory paroxysmal atrial fibrillation.

Why the study?

Does radiofrequency catheter modification of the AV junction alter electrophysiological properties and control ventricular rate in patients with medically refractory paroxysmal atrial fibrillation?

Population

50 patients with medically refractory paroxysmal atrial fibrillation

Design

Cohort

Follow-up

14 +/- 8 months, ~92-98 days

Authors

SCShih‐Ann ChenElectrophysiology SLShih‐Huang LeeNational Synchrotron Radiation Research Center CCChern‐En ChiangCross-Cutting Cardiology

Discussion

Member takes

Implication

Supports AV nodal modification for rate control in refractory paroxysmal AF; leaves open need for randomized confirmation of efficacy and durability.

Key Points

To identify the electrophysiological mechanisms and conduction changes responsible for successful radiofrequency modification of the atrioventricular junction in patients with drug-refractory paroxysmal atrial fibrillation.
Assessed 50 patients with medically refractory paroxysmal atrial fibrillation, categorized into Group 1 (N=40 without dual AV node physiology) undergoing midseptal/posteroseptal modification and Group 2 (N=10 with dual AV node physiology) undergoing slow pathway ablation.
Conducted late follow-up electrophysiological studies at 98 ± 10 days for Group 1 and 92 ± 7 days for Group 2, with long-term clinical monitoring extending through 14 ± 8 to 15 ± 7 months.
In Group 1, modification succeeded in 36 of 40 patients (with 3 developing AV block), where follow-up testing showed ERP and WBCL prolongation in 67% and additional AH interval prolongation in 22%, with ventricular rate decreases correlating with WBCL prolongation (r=-0.691, P=0.019 and r=-0.90, P=0.01, respectively).
In Group 2, reductions in ventricular rate strongly correlated with increases in AV node ERP (r=-0.926, P=0.0001) and WBCL (r=-0.969, P=0.0001), contributing to an overall procedure feasibility of 92% across the cohort.

Study Design

Type

Cohort (n=50)

Structured PICO

Does radiofrequency catheter modification of the AV junction alter electrophysiological properties and control ventricular rate in patients with medically refractory paroxysmal atrial fibrillation?

Population

50 patients with medically refractory paroxysmal atrial fibrillation (40 without dual AV node physiology, 10 with dual AV node pathway)

Intervention

Radiofrequency catheter modification of the atrioventricular junction (right midseptal and posteroseptal areas or elimination of slow pathway)

Outcome

Changes in electrophysiological characteristics (AV node effective refractory period, Wenckebach block cycle length, AH interval) and ventricular ratesurrogate

Radiofrequency modification of the AV junction is a feasible strategy for rate control in medically refractory paroxysmal atrial fibrillation, acting via elimination of posterior input or partial injury to the compact node.

Cite This Study

Chen et al. (1996) conducted a cohort in Medically refractory paroxysmal atrial fibrillation (n=50). Radiofrequency catheter modification of the right midseptal and posteroseptal areas was evaluated on Successful modification. Radiofrequency modification of the right midseptal and posteroseptal areas was feasible and successful in 92% of patients with medically refractory paroxysmal atrial fibrillation.

synapsesocial.com/papers/6a0934cfb7dd28a06e160e79 https://doi.org/10.1161/01.cir.93.9.1690

Topics

Atrial fibrillation Persistent AF management AF ablation outcomes Anticoagulation in AF

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Implication

Supports AV nodal modification for rate control in refractory paroxysmal AF; leaves open need for randomized confirmation of efficacy and durability.

Electrophysiological Mechanisms in Successful Radiofrequency Catheter Modification of Atrioventricular Junction for Patients With Medically Refractory Paroxysmal Atrial Fibrillation

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

Topics

Electrophysiological Mechanisms in Successful Radiofrequency Catheter Modification of Atrioventricular Junction for Patients With Medically Refractory Paroxysmal Atrial Fibrillation

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

Also Consider

Topics

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