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INTRODUCTION: The implantable cardiac devices like regular pacemaker, cardiac resynchronization therapy (CRT) automatic implantable defibrillators (ICD) and CRT associate with ICD (CRTD) are now being used frequently. Patient visits to pacemaker and ICD clinics for review and monitoring, has increases significantly. We present the experience of monitoring via satellite of patients with implantable cardiac devices in Mexico. METHODS: Eighteen patients were selected from the arrhythmia Service Cardiac Electrophysiology and Stimulation of High Specialty Medical Unit (UMAE) of Specialties Hospital Dr. Antonio Fraga Mouret. National Medical Center (NMC) La Raza Mexican Social Security Institute (IMSS), who had a device (CRT, ICD y CRT-D) that is able to send information through the BIOTRONIK Home Monitoring system, from March 2006, to March 2009. RESULTS: We obtained 4,980 transmissions as reports and 149 alerts recorded events, of which 50 were in ventricular fibrillation, 14 in ventricular tachycardia, frequent ventricular extra systoles exceeded by the range allowed in one hour were 25, electrograms default 26; and atrial fibrillation at 11. CONCLUSIONS: The monitoring system via satellite is reliable and useful diagnostic tool, which permits early detection, opportune treatment and effective monitoring of implantable cardiac devices.

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Introducción: Actualmente, el monitoreo de algunos dispositivos cardiacos implantables como los marcapasos y el desfibrilador automático, así como la terapia de resincronización cardiaca asociada con desfibrilador automático implantable, son los que se utilizan con mayor frecuencia y el seguimiento de los mismos se puede llevar a cabo por vía satelital; por ello su revisión y monitoreo ha incrementado las visitas presenciales en las clínicas de marcapasos y desfibriladores. A continuación se informa la experiencia de la monitorización vía satélite de dichos dispositivos en un centro hospitalario de tercer nivel. Métodos: Se seleccionaron 18 pacientes de la Clínica de Marcapasos del Servicio de Electro-fisiología y Estimulación Cardiaca de la Unidad Médica de Alta Especialidad del Hospital de Especialidades Dr. Antonio Fraga Mouret, Centro Médico Nacional La Raza del Instituto Mexicano del Seguro Social a los cuales se les había implantado un desfibrilador o resincronizador con capacidad de vigilancia remota vía satélite (Home Monitoring BIOTRONIK, Alemania), de marzo del 2006 a marzo del 2009. Resultados: Como reportes, se obtuvieron 4980 transmisiones y 149 alertas por sucesos registrados, de los cuales 50 fueron de fibrilación ventricular, 14 de taquicardia ventricular, extrasístoles ventriculares frecuentes superadas por el rango permitido en una hora fueron 25, fibrilación auricular en 11. Conclusión: El sistema de vigilancia remota vía satélite es una herramienta de diagnóstico confiable, que permite una detección temprana de las principales arritmias que ocurren en los sujetos con dispositivos cardiacos implantables.

Introduction: The implantable cardiac devices like regular pacemaker, cardiac resynchronization therapy (CRT) automatic implantable defibrillators (ICD) and CRT associate with ICD (CRT-D) are now being used frequently. Patient visits to pacemaker and ICD clinics for review and monitoring, has increases significantly. We present the experience of monitoring via satellite of patients with implantable cardiac devices in Mexico. Methods: Eighteen patients were selected from the arrhythmia Service Cardiac Electrophysiology and Stimulation of High Specialty Medical Unit (UMAE) of Specialties Hospital Dr. Antonio Fraga Mouret. National Medical Center (NMC) La Raza Mexican Social Security Institute (IMSS), who had a device (CRT, ICD y CRT-D) that is able to send information through the BIOTRONIK Home Monitoring system, from March 2006, to March 2009. Results: We obtained 4,980 transmissions as reports and 149 alerts recorded events, of which 50 were in ventricular fibrillation, 14 in ventricular tachycardia, frequent ventricular extra systoles exceeded by the range allowed in one hour were 25, electrograms default 26; and atrial fibrillation at 11. Conclusions: The monitoring system via satellite is reliable and useful diagnostic tool, which permits early detection, opportune treatment and effective monitoring of implantable cardiac devices.

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We present the case of a 66 years old man with recurrent episodes of syncope, up to three times during the last two months without previous symptoms. An ECG after the syncope showed a bilateral block (left anterior fascicle block and right bundle branch block) and first grade atrioventricular block. The exercise test did not demonstrate either AV conduction disorders or tachyarrhythmia episodes. Holter monitoring showed premature ventricular complexes; tilt testing and carotid sinus massage were normal. The electrophysiologic study revealed no alteration in the conduction system. Throughout atrial and ventricular stimulation documented no tachyarrhythmias. However, intravenous administration of 12 mg of adenosine induced complete AV infra-His block with ventricular asystolia of 7.2 sec duration. Adenosine testing can identify patients with syncope due to paroxysmal AV block even when the electrophysiological findings and other conventional tests are not conclusive.

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We present the case of a woman with familial antecedents of a brother who died suddenly at the age of 39 years, and an other with Brugada syndrome. The ECG had not shown the typical pattern of the Brugada syndrome. Based on these antecedents, we decided to perform a pharmacological test with endovenous propafenone, which revealed the electrocardiographic alterations at 10 min after the administration. This is the first case in our knowledge in which endovenous propafenone manifested a concealed Brugada syndrome.

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