Inability to capture with increasing current strength: Is this near-field or far-field?
J Cardiovasc Electrophysiol
; 31(4): 960-963, 2020 04.
Article
en En
| MEDLINE
| ID: mdl-32077548
ABSTRACT
We present a case of wide-complex tachycardia in which the clinical electrophysiological diagnosis was considered to be bundle branch re-entry ventricular tachycardia. A series of ventricular entrainment attempts were performed from the left and right ventricular septum to confirm the diagnosis. Entrainment pacing with a general current output (10 mA) was performed from the right ventricular septum with manifest fusion and a post-pacing interval similar to tachycardia cycle length. Thereafter, another entrainment attempt with a greater current output (20 mA) was performed from the same site. Paradoxically, concealed fusion was demonstrated by selective RB capture only, though there was no clear "RB" potential seen. In this case, we attempt to explain and illustrate the mechanism of paradoxical near-field inability to capture with increasing current strength.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Fascículo Atrioventricular
/
Potenciales de Acción
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Estimulación Cardíaca Artificial
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Taquicardia Ventricular
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Técnicas Electrofisiológicas Cardíacas
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Electrocardiografía
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Frecuencia Cardíaca
Tipo de estudio:
Prognostic_studies
Límite:
Adult
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Female
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Humans
Idioma:
En
Año:
2020
Tipo del documento:
Article