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Concealed accessory pathway with long conduction times and incremental properties: a case report
E B Sternick1, L M Gerken, E G God
1Department of Cardiology, Hospital Vera Cruz, Belo Horizonte, Minas Gerais, Brazil. edstern@gold.com.br
Journal of Cardiovascular Electrophysiology
|February 24, 2001
Summary
This study describes a unique type of permanent junctional reciprocating tachycardia (PJRT) that occurs during daytime and physical activity. The tachycardia exhibited a novel reverse Wenckebach block pattern at the accessory pathway, which was successfully ablated.
Area of Science:
- Electrophysiology
- Cardiology
Background:
- Permanent junctional reciprocating tachycardia (PJRT) is a rare supraventricular tachycardia.
- Understanding the varied electrophysiological properties of accessory pathways is crucial for effective ablation.
Observation:
- A peculiar form of PJRT was observed, exclusively occurring during daytime and physical activity.
- Electrocardiogram (ECG) during tachycardia revealed a progressive shortening of the ventriculoatrial (VA) interval, a phenomenon resembling a reverse Wenckebach block at the accessory pathway level.
- This unusual VA conduction pattern was reproducible with ventricular pacing and occurred during spontaneous tachycardia episodes.
Findings:
- The accessory pathway demonstrated slow and incremental conduction properties, leading to a progressive block.
- Successful ablation of the accessory pathway in the right posteroseptal region eliminated ventriculoatrial conduction and prevented tachycardia recurrence.
- The observed phenomenon represents a previously undescribed pattern of conduction block in PJRT.
Implications:
- This case highlights a novel presentation of PJRT with unique electrophysiological characteristics.
- The findings expand the understanding of accessory pathway behavior and conduction block mechanisms.
- Successful ablation offers a curative treatment for this specific type of tachycardia, improving patient management.