RESUMEN
Se han comunicado casos aislados de subsensado de fibrilación ventricular por el cardiodesfibrilador implantable. La mayoría de ellos ocurrieron durante la medición de umbrales desfibrilatorios. Se ha sugerido que este tipo de subsensado podría ser una causa potencial de muerte súbita. En esta presentación se describe a un paciente de 4 años con miocardiopatía hipertrófica que sufrió un episodio espontáneo de fibrilación ventricular, con una gran alternancia en la amplitud de los electrogramas ventriculares locales, que fue subsensado y no tratado por el dispositivo y provocó muerte súbita.
In few cases implantable cardiodefibrillators have been reported to undersense ventricular fibrillation, and most of them happened during the measurement of defibrillation thresholds. This type of undersensing has been suggested as a potential cause of sudden death. In this case report we describe a 4-year old boy with hypertrophic myocardiopathy who suffered a spontaneous episode of ventricular fibrillation with a great alternation in the amplitude of local ventricular electrograms. The episode was undersensed by the device and therefore it was not treated, causing the child's death.
RESUMEN
Syncope is a symptom characterized by transient and autolimited loss of consciousness, generally accompanied by the inhability to stand upright and maintain postural tone, spontaneous recovery and without sequelae. It is produced by a sudden cerebral global and transient hypoperfussion. After assessment of the symptoms and its possible mechanism, it is mandatory to determine if it is an essential syncope or otherwise another entity resembling a syncope, in order to discard it rapidly....Other details are commented in the article