Unusual capture of a capture beat. Lessons learned from the 12-lead electrocardiogram
1Department of Electrophysiology, Heart Center, University of Leipzig, Strümpellstr. 39, 04289, Leipzig, Deutschland. s.richter@med.uni-leipzig.de
Herzschrittmachertherapie & Elektrophysiologie
|March 5, 2011
Summary
Capture beats during slow ventricular tachycardia indicate ventriculoatrial block. Ablation of a left posterior papillary muscle focus resolved the arrhythmia, ensuring the patient remained free of symptoms.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Arrhythmias
Background:
- Right bundle-branch block tachycardia can be associated with complex electrophysiological phenomena.
- Ventriculoatrial (VA) conduction is crucial for understanding tachycardia mechanisms and guiding ablation strategies.
Observation:
- A 63-year-old woman presented with slow, right bundle-branch block tachycardia.
- Capture beats were observed, suggesting a failure of retrograde conduction.
- This failure was attributed to ventriculoatrial Wenckebach block, a specific pattern of conduction delay.
Findings:
- Electrocardiogram analysis indicated a ventricular origin in the left posterior papillary muscle.
- Endocardial activation mapping confirmed the precise focal origin of the ventricular tachycardia.
- Successful radiofrequency ablation targeted the identified papillary muscle focus.
Implications:
- This case highlights the diagnostic significance of capture beats in identifying VA block during tachycardia.
- Papillary muscle ventricular tachycardia is a treatable arrhythmia with successful ablation.
- The findings contribute to the understanding and management of complex ventricular arrhythmias.
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