[Cardiac arrhythmias and amyloidosis]. / Las arritmias en la amiloidosis cardiaca.

Cardiac amyloidosis (CA) is a form of cardiomyopathy characterized by the extracellular deposit of protein fibers in the myocardium, leading to the development of heart failure, arrhythmias, and electrical conduction system alterations. It is known that most cardiomyopathies have a close relationship with heart rhythm abnormalities, however, CA is specially related to different kinds of arrhythmias even in pre-diagnosis stages. Arrhythmias like atrial fibrillation are present in up to 70% of patients with CA associated with a high risk of cardioembolic complications independent of the risk stratification. Ventricular arrhythmias are frequent, but the use of implantable cardioverter defibrillator has not been demonstrated to improve survival. The Atrial-Ventricular node disease is also common, and is frequently associated with the implantation of a pacemaker, even in asymptomatic patients. In this review, we clarify the recommendations of the most current guidelines, summarize historical and contemporaneous data and describe evidence-based strategies for the management of arrhythmias and their complications in CA.

[Atypical presentation of the Wellens electrocardiographic pattern associated with coronary bifurcation lesión]. / Presentación atípica del patrón electrocardiográfico de Wellens asociado con lesión de bifurcación coronaria.

We present a patient who was admitted to the emergency room due to unstable angina, with an initial electrocardiogram without signs of acute ischemia and a favorable clinical evolution. During hospitalization, she developed the Wellens electrocardiographic pattern, noted in the literature as an infrequent, poorly identified finding and with an ominous prognosis. This electrocardiographic pattern is described in precordial derivatives, suggesting a significant lesion of a principal epicardial artery; our patient had similar electrocardiographic alterations in the high lateral leads, in whom the coronary bifurcation lesion not previously described in this scenario was confirmed.

[Arrhythmias and Sudden Death Risk in Hypertrophic Cardiomyopathy]. / Arritmias y Riesgo de Muerte Súbita en Cardiomiopatía Hipertrófica.

The risk of sudden death in hypertrophic cardiomyopathy is related to the presence of ventricular arrhythmias in most cases. Finding the best schemes to assess the probability of arrhythmic complications will remain a challenge for modern Cardiology. Meanwhile, the multifactorial approach is the best strategy to avoid the unnecessary implantation of devices such as the implantable cardioverter defibrillator. Although the electrocardiogram remains an excellent diagnostic tool, even before echocardiographic expression, it does not have a clear role as a risk factor. However, the identification of associated arrhythmias such as preexcitation or long QT and variants of presentation as apical hypertrophic cardiomyopathy, allows identifying patients with high probability of sudden death. During the last few years, cardiac resonance and quantification of intramyocardial fibrosis (the basic mechanism of ventricular arrhythmias) have gained an important role in the evaluation of these patients.In particular, pediatric patients must have an individualized approach due to the poor prognosis at early ages and the uncertain role of different tools for risk assessment and treatment.

Hypertension and cardiac arrhythmias: a consensus document from the European Heart Rhythm Association (EHRA) and ESC Council on Hypertension, endorsed by the Heart Rhythm Society (HRS), Asia-Pacific Heart Rhythm Society (APHRS) and Sociedad Latinoamericana de Estimulación Cardíaca y Electrofisiología (SOLEACE).

Hypertension is a common cardiovascular risk factor leading to heart failure (HF), coronary artery disease, stroke, peripheral artery disease and chronic renal insufficiency. Hypertensive heart disease can manifest as many cardiac arrhythmias, most commonly being atrial fibrillation (AF). Both supraventricular and ventricular arrhythmias may occur in hypertensive patients, especially in those with left ventricular hypertrophy (LVH) or HF. Also, some of the antihypertensive drugs commonly used to reduce blood pressure, such as thiazide diuretics, may result in electrolyte abnormalities (e.g. hypokalaemia, hypomagnesemia), further contributing to arrhythmias, whereas effective control of blood pressure may prevent the development of the arrhythmias such as AF. In recognizing this close relationship between hypertension and arrhythmias, the European Heart Rhythm Association (EHRA) and the European Society of Cardiology (ESC) Council on Hypertension convened a Task Force, with representation from the Heart Rhythm Society (HRS), Asia-Pacific Heart Rhythm Society (APHRS), and Sociedad Latinoamericana de Estimulación Cardíaca y Electrofisiología (SOLEACE), with the remit to comprehensively review the available evidence to publish a joint consensus document on hypertension and cardiac arrhythmias, and to provide up-to-date consensus recommendations for use in clinical practice. The ultimate judgment regarding care of a particular patient must be made by the healthcare provider and the patient in light of all of the circumstances presented by that patient.

Hipotiroidismo inducido por Amiodarona: reporte de caso / Amiodarone-induced hypothyroidism: case report

Se describe el caso de una mujer de 57 años de edad, con diagnóstico de síndrome de Wolf Parkinson White, en tratamiento con amiodarona 200 mg/día; que acudió por presentar palpitaciones, fatiga y aumento de sueño. Al examen físico no se encontró bocio, pero los reflejos osteotendinosos estaban prolongados. Los exámenes auxiliares mostraron TSH elevado, T4 libre disminuido y anticuerpos antiperoxidasa tiroidea negativos. Se suspendió la amiodarona y se inició levotiroxina. Después de dos meses; los niveles de TSH y T4 libre eran normales y la paciente no presentaba molestias. La amiodarona está asociada a diversos efectos adversos que pueden limitar su uso. Entre estos efectos adversos, se describe el hipotiroidismo inducido, que se caracteriza por TSH elevado, T4 libre disminuido y síntomas inespecíficos como fatiga, intolerancia al frío y piel seca. El tratamiento de elección es la levotiroxina.

We report a case of a Wolf Parkinson White syndrome in a 57-yearl-old woman receiving amiodarone (200 mg/ day) who presented with tachycardia, fatigue and somnolence. The physical examination did not reveal goiter, but the osteotendinous reflexes were brisk. Laboratory examinations revealed high TSH level, low T4 free level and negative antiperoxidase antibodies. Amiodarone was stopped and levotiroxine was started. Two months after, TSH and T4 free levels were normal and the patient was asymptomatic. Amiodarone is associated with several side effects that can preclude its indication; one of these side effects is hypothiroidism, characterized by high TSH levels, low T4 free levels and unspecific symptoms such as fatigue, cool intolerance and dry skin. The treatment of choice is levotiroxine.

Arritmia ventricular derecha de alta densidad en pacientes sin cardiopatía estructural: características clínicas y electrocardiográficas / Right ventricular arrhythmia of high density in patients without structural heart disease: clinical characteristics and electrocardiographic

Las arritmias ventriculares originadas en el ventrículo derecho son un motivo frecuente de consulta en cardiología y suelen ser medicadas con antiarrítmicos. Objetivo. Describir las características clínicas y electrocardiográficas de pacientes con arritmia ventricular derecha de alta densidad. Métodos. presentamos 32 pacientes con arritmia ventricular de alta densidad (CVP ≥ 30/h), originada en el VD y con ecocardiografía normal. Resultados. la edad promedio de los pacientes fue 56 ± 18 años, la HTA y la dislipidemia fueron las comorbilidades más frecuentes, el 85% se encontraba sintomático en la primera evaluación y en su mayoría estaban medicados con fármacos antiarrítmicos. En la monitorización electrocardiográfica ambulatoria se encontró un promedio de 9350,09 ± 3455 CVP/ 24 h (casi un tercio tuvieron más de 10 000 CVP), los dos patrones ECG más frecuentes en V1 fueron el QS y el rS, con eje inferior derecho y onda R monofásica en D I. EL 45% de los pacientes se encontraron en tratamiento con betabloqueadores En el seguimiento de 6 y 12 meses los pacientes referían menos síntomas incluso sin tratamiento farmacológico, ninguno de ellos requirió del uso de amiodarona. Conclusión. Las arritmias ventriculares derechas originadas en el tracto de salida, de alta densidad y no asociadas a cardiopatía estructural, presentan una evolución y pronóstico favorable, incluso sin tratamiento farmacológico.

The ventricular arrhythmias originated in the rigth ventricle are one of the most common reasons of cardiology consulting and almost always medicated with antiarrhythmic drugs. Objective. To describe the clinical and electrocardiographic characteristicsin patients with high density right ventricular arrhythmia. Methods. we introduce 32 patients diagnosed with high density ventricular arrhythmia (VPCs ≥ 30/h), originated in the RV andnormal echocardiography. Results. The average age was 56 ± 18 years, hypertension and dyslipidemia were the most common comorbilities, the 85% ofpatients complained about symptoms in the first examination and the majority had been treated with antiarrhythmics drugs. During the ambulatory electrocardiographic monitorization wefound an average of de 9350,09 ± 3455 VPCs/ 24 hours (about a third presented more than 10000 VPCs), the two most common electrocardiographic patterns in VI were QS and rS, with right inferior axis and monophasic R wave in DI. The 45% of patients had been treated with beta-blockers. During the follow up at 6 and 12 months, the patients reported less symptoms des pite they do not receive any treatment, amiodarona was not required. Conclusion. The high-density right ventricular arrhythmias originated in the outflow tract and no associated with structural abnormalities, present a non complicated prognosis, even if they are not medicated.

Un caso de QT largo y torsades de pointes por ciprofloxacino / No disponible

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Sindrome de Brugada: reporte de un caso y revisión de la literatura / Brugada syndrome: a case report and review

Desde su primera descripción el Sindrome de Brugada ha despertado gran interés científico como causa de muerte súbita. Presentamos el caso de un varón de 45 años quien ingresó al hospital en arresto cardiaco y en su evolución se le diagnosticó Sindrome de Brugada lográndose el implante de un cardiodesfibrilador como opción terapéutica definitiva. Resaltamos la importancia de reconocer el patrón electrocardiográfico característico y de considerar esta canalopatía en el diagnóstico diferencial de muerte súbita.

Since its first description the Brugada Syndrome has attracted great scientific interest because it is a cause ofsudden death. We show the case of a man 45 years old who arrived to our hospital in cardiac arrest. During hospitalization he was diagnosed with Brugada Syndrome. He received an implantable cardioverter-defibrillator as definitive treatment. We highlight the importance of being aware of the classic electrocardiographic pattern and considering this channelopathy in the differential diagnosis of cardiac arrest.

Predictores de éxito de la ablación desde el seno no coronario de la raíz aórtica de taquicardias auriculares con origen en la proximidad del nodo auriculoventricular / Predictores of success of the ablation from the not coronary bosom of the aortic root of taquicardias earphones with origin in the proximity of the node atrioventricular

Introducción. Las taquicardias auriculares (TA) con origen en la proximidad del nodo AV representan hasta el 10 por ciento de las TA. El tratamiento con readiofrecuencia(RF) implica riesgo de lesión del nodo AV. Pacientes. Se evaluaron 11 pacientes de una serie de 61 TA con activación auricular más precoz en la proximidad del nodo AV. Resultados. La aplicación de RF tuvo éxito en 10 localizaciones: 5 perihisiana derecha, 1 foramen oval derecho, 1 septum interauricular izquierdo y 3 seno no coronario de Valsalva. La morfología de la onda P y la longitud de ciclo de las TA no fueron diferentes entre las localizaciones. La activación auricular menor a 80ms y un electrograma unipolar con morfología QS fueron observados solo en pacientes con éxito desde la raíz aórtica. El mapa de isocronas con CARTO de la aurícula derecha no fue útil en predecir el lugar de éxito. La aplicación de RF en la raíz aórtica terminó la taquicardia en zonascon precocidades entre 20 y 35 ms.Conclusión. No se encontraron predictores del lugar de éxito de la aplicación de radiofrecuencia en pacientes con TA originada en la proximidad del nodo AV. El acceso aórtico retrógrado puede ser eficiente y seguro en el tratamiento de algunas TA.

Introduction. Focal atrial tachycardias (AT) originating from near the AV node represent 10 per cent of AT. Radiofrequency (RF) treatment implies risk of impairing AV conduction. Patients. The study population included 11 patients of a consecutive series of 61 with AT in whom mapping of the right atrium revealed earliest activation near the AV node. Results. Radiofrequency current was successful in 10 patients: 5 right perihisian, 1 right oval foramen, 1 left side of the interatrial septum and 3 in the noncoronary sinus of Valsalva; applications of RF and cryoablation,only transiently terminated the arrhythmia. The Pwave morphology and cycle length of AT did not differ between different locations. Atrial activation was shorter 80 ms and unipolar electrogram with QS morphology, were only present in patients with ablation procedure performed at the aortic root. CARTO© isochronal maps of right atrium not useful to identify successful ablationsite. Mapping the aortic root found precocities from 20 to 35 ms at noncoronary sinus, RF energy delivered from this site successfully terminated the tachycardia. Conclusion. There were no good predictors for the best ablation approach in patients with atrial tachycardia originating near AV node. Aortic approach may be safe and efficient on the treatment of AT.