Early septal activation, successful lateral ablation.
Hamid Reza Bonakdar1, Amir Farjam Fazelifar, Zahra Emkanjoo
1Department of Pacemaker and Cardiac Electrophysiology, Rajaie Cardiovascular Medical and Research Centre, Tehran, Iran.
Cardiology Journal
|July 25, 2008
Summary
Changes in coronary sinus activation patterns during ablation can indicate accessory pathways. Intra-atrial conduction block can reverse these patterns, potentially leading to complications if overlooked.
Area of Science:
- Electrophysiology
- Cardiology
- Cardiac Electrophysiology
Background:
- The coronary sinus activation pattern is crucial for identifying arrhythmia mechanisms and accessory pathways.
- Understanding these patterns aids in radiofrequency ablation strategies.
- Changes during ablation require careful evaluation for additional pathways or pathway innocence.
Observation:
- Intra-atrial conduction block can significantly alter the coronary sinus activation pattern.
- This phenomenon can be misinterpreted if not recognized.
- A case involving left lateral accessory pathway conduction demonstrated a complete reversal of the pattern due to intra-atrial block.
Findings:
- Intra-atrial conduction block can mimic or mask accessory pathway signals.
- The coronary sinus activation pattern is not static and can be influenced by conduction abnormalities.
- Complete reversal of the expected pattern was observed in the presented case.
Implications:
- Failure to recognize intra-atrial conduction block can lead to misdiagnosis and inappropriate ablation strategies.
- Awareness of this phenomenon is vital to prevent irreversible complications during electrophysiological procedures.
- This case highlights the importance of considering conduction system changes during cardiac ablation.
