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. 1998 Dec;80(6):627–628. doi: 10.1136/hrt.80.6.627

Junctional ectopic tachycardia evolving into complete heart block

H Henneveld 1, P Hutter 1, M Bink-Boelkens 1, N Sreeram 1
PMCID: PMC1728860  PMID: 10065037

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.

 Keywords: junctional ectopic tachycardia;  heart block;  congenital heart disease;  paediatrics

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Figure 1  .

Figure 1  

12 lead ECG demonstrating a regular, narrow QRS tachycardia with AV dissociation.

Figure 2  .

Figure 2  

12 lead ECG 36 hours later, demonstrating resolution of tachyarrhythmia with persistence of AV dissociation and narrow QRS complexes.


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