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Junctional ectopic tachycardia evolving into complete heart block
H Henneveld1, P Hutter, M Bink-Boelkens
1Department of Cardiology, Wilhelmina Children's Hospital, Utrecht, Netherlands.
Insights
Congenital junctional ectopic tachycardia in an infant may progress to complete atrioventricular block, potentially leading to heart failure and the need for a pacemaker.
Area of Science:
- Pediatric Cardiology
- Electrophysiology
- Congenital Heart Disease
Background:
- Congenital junctional ectopic tachycardia (CJET) is a rare condition.
- Understanding the long-term sequelae of CJET is crucial for patient management.
Observation:
- An 8-month-old girl transitioned from CJET to complete atrioventricular block within 36 hours.
- Two years later, she developed left ventricular dilation and severe bradycardia (<30 bpm during sleep).
Findings:
- The patient required a transvenous permanent pacemaker due to progressive heart dysfunction.
- This case suggests a potential progression of a pathological process in the atrioventricular junction.
Implications:
- Early recognition and monitoring of CJET patients are vital.
- A unified pathological process may underlie both CJET and subsequent complete atrioventricular block.
- This progression can lead to significant cardiac remodeling and heart failure.
Abstract:
Transition from congenital junctional ectopic tachycardia to complete AV block was observed in an 8 month old girl, over a 36 hour period, during initial hospital admission. Two years later she had evidence of a rapidly increasing left ventricular end diastolic diameter, associated with lowest heart rates during sleep of < 30 beats/min. A transvenous permanent pacemaker was therefore implanted. This finding supports the idea that a pathological process in the area of the AV junction, initially presenting as junctional ectopic tachycardia may later extend to sudden complete atrioventricular block.