Disfunción del nódulo sinusal asociado a estenosis severa proximal de la arteria coronaria derecha y vasoespasmo coronario

RESUMEN La disfunción del nódulo sinusal (DNS) es generalmente secundaria a la senescencia del nodo sinusal y del miocardio auricular circundante. Estamos presentando un paciente de 59 años de edad, hipertenso sin tratamiento y con antecedente de síncope en dos oportunidades en los últimos 4 meses. Ingresa debido a un flutter auricular con conducción auriculoventricular 1:1 con una frecuencia cardiaca de 280 lat/min que cede con goteo de amiodarona. Un Holter de 24 horas demostró un ritmo sinusal predominante, episodios paroxísticos de fibrilación auricular con respuesta ventricular alta, bradicardia sinusal de 47 lat/min. Se realizó el diagnóstico de disfunción del nódulo sinusal, Rubenstein tipo III (Síndrome Bradicardia-Taquicardia). Una coronariografía constató una estenosis del 80% en segmento proximal de la arteria coronaria derecha con componente espástico. La arteria del nódulo sinusal emerge del segmento proximal de la coronaria derecha. Se realizó una angioplastia exitosa con stent medicado. Otro estudio Holter de 24 horas de control pos-angioplastia registró nuevamente episodios paroxísticos de fibrilación auricular con respuesta ventricular alta y episodios de pausas de hasta 3.100 milisegundos por lo que se implantó un marcapasos bicameral. A pesar del restablecimiento de un flujo sanguíneo adecuado a la arteria del nódulo sinusal con la angioplastia de la coronaria derecha no se obtuvo una mejoría de la disfunción del nódulo sinusal.

ABSTRACT Sinus node dysfunction (SND) is generally secondary to senescence of the sinus node and the surrounding atrial myocardium. We are presenting a 59-year-old patient, hypertensive without treatment and with a history of syncope on two occasions in the last 4 months. He was admitted due to a 1: 1 atrioventricular conduction atrial flutter with a heart rate of 280 beats/min that subsides with an amiodarone drip. A 24-hour Holter monitor showed predominant sinus rhythm, paroxysmal episodes of atrial fibrillation with high ventricular response, sinus bradycardia of 47 beats/min. The diagnosis of sinus node dysfunction, Rubenstein type III (Bradycardia-Tachycardia Syndrome) was made. A coronary angiography confirmed an 80% stenosis in the proximal segment of the right coronary artery with a spastic component. The sinus node artery emerges from the proximal segment of the right coronary artery. A successful angioplasty was performed with a medicated stent. Another 24-hour Holter study of post-angioplasty control again recorded paroxysmal atrial fibrillation with high ventricular response episodes and pause episodes of up to 3,100 milliseconds, for which a dual-chamber pacemaker was implanted. Despite the restoration of adequate blood flow to the sinus node artery with right coronary angioplasty, no improvement in sinus node dysfunction was obtained.

Manejo terapéutico farmacológico actual en la hipertensión arterial sistémica del adulto

RESUMEN El tratamiento con agentes farmacológicos de la hipertensión arterial sistémica (HTA) produce una disminución significativa de las complicaciones cardiovasculares. La terapia antihipertensiva farmacológica produce una reducción del riesgo relativo de casi 50% en la incidencia de insuficiencia cardíaca, una reducción del riesgo relativo de ictus de hasta 40%, y de hasta 25% de reducción del riesgo relativo en el infarto de miocardio. El grado de reducción de la presión arterial, no la elección de la medicación antihipertensiva, es el principal determinante de la reducción del riesgo cardiovascular en pacientes con HTA. La terapia de combinación con fármacos de diferentes clases tiene un efecto de reducción de la presión arterial sustancialmente mayor que la duplicación de la dosis de un solo agente. Sin embargo, el riesgo de efectos adversos, costos e inconvenientes para el paciente aumentan a medida que se agregan más medicamentos antihipertensivos. El objetivo es realizar una revisión narrativa sobre el manejo terapéutico farmacológico actual de la HTA del adulto.

ABSTRACT Treatment with pharmacological agents for systemic arterial hypertension (HT) produces a significant decrease in cardiovascular complications. Pharmacologic antihypertensive therapy produces a relative risk reduction of nearly 50% in the incidence of heart failure, a relative risk reduction of stroke of up to 40%, and a relative risk reduction of up to 25% in myocardial infarction. The degree of reduction in blood pressure, not the choice of antihypertensive medication, is the main determinant of cardiovascular risk reduction in patients with HT. Combination therapy with drugs of different classes has a blood pressure lowering effect substantially greater than doubling the dose of a single agent. However, the risk of adverse effects, costs, and inconvenience to the patient increase as more antihypertensive medications are added. The objective is to carry out a narrative review on the current pharmacological therapeutic management of hypertension in adults.

Medidas preventivas y manejo diagnóstico y terapéutico de la hipertensión arterial y las crisis hipertensivas / Preventive measures and diagnostic and therapeutic management of arterial hypertension and hypertensive crises

Introducción: La hipertensión arterial (HTA) es definida por algunos como una enfermedad, aunque también se la considera como factor de riesgo cardiovascular. Hoy conocemos como las enfermedades cardiovasculares dependen más de la influencia simultánea de varios factores de riesgo que de la acción aislada de uno de ellos. Por ello, toda actividad preventiva en este campo, debe ser multifactorial y dirigida en diversos sentidos. Desarrollo: Cuando la HTA no es controlada se triplica la probabilidad de accidente cerebrovascular e insuficiencia cardiaca, con menor incidencia de enfermedad coronaria y arterial periférica. El propio aumento de la masa del ventrículo izquierdo, así como los cambios estructurales que tienen lugar a nivel del miocardio y de los vasos coronarios pueden desencadenar episodios de cardiopatía isquémica. El remodelado intersticial y el aumento de la masa del ventrículo izquierdo son factores predisponentes a la aparición de arritmias ventriculares y muerte súbita. Es importante evaluar y tratar a los pacientes recién diagnosticados con HTA con medicamentos adecuados y seguimiento para prevenir la progresión de la hipertensión no controlada a crisis hipertensivas, es decir, urgencia o emergencia hipertensiva. Conclusiones: El reconocimiento inmediato de una emergencia hipertensiva con las pruebas de diagnóstico apropiadas conducirá a una reducción adecuada de la presión arterial, aliviando la incidencia de consecuencias negativas a los órganos diana. El tratamiento adecuado ayudará a aliviar la progresión de la enfermedad y mejorar los resultados a largo plazo.

Introduction: Hypertension (HT) is defined by some as a disease, although it is also considered a cardiovascular risk factor. Today we know cardiovascular diseases depend more on the simultaneous influence of several risk factors than on the isolated action of one of them. Therefore, all preventive activity in this field must be multifactorial and directed in various ways. Developing: When HT is not controlled, the probability of stroke and heart failure, with a lower incidence of coronary and peripheral arterial disease triples. The increase in left ventricular mass itself, as well as, the structural changes that occur at the level of myocardium and coronary vessels, can trigger episodes of ischemic heart diseases. Interstitial remodeling and increased left ventricular mass are predisposing factors to the appearance of ventricular arrhythmias and sudden death. It is important to evaluate and treat newly diagnosed patients with HT with recommended medications and follow-up to prevent the progression of uncontrolled HT to hypertensive crises, that is, urgency or emergency hypertension. Conclusion: The immediate recognition of a hypertensive emergency with the affected diagnostic tests will lead to an adequate reduction of blood pressure, alleviating the incidence of negative consequences to the target organs. Proper treatment helps to decrease the progression of the disease and improves long-term outcomes.

Frecuencia de factores de riesgo para el desarrollo de prediabetes en el personal sanitario

RESUMEN Introducción: los factores de riesgo importantes para el desarrollo de y diabetes tipo 2 son la obesidad, la dislipidemia y la hiperglucemia. El incremento de la frecuencia las enfermedades crónicas no transmisibles es un fenómeno mundial y Paraguay no es la excepción. Objetivos: determinar la frecuencia de desarrollar prediabetes con respecto a patrones alimentarios, identificando trastornos en el metabolismo de los hidratos de carbono en el personal de blanco, teniendo en cuenta el horario laboral y actitudes alimentarias. Metodología: estudio analítico, prospectivo, observacional, de corte trasversal. Estudio enfocado en el personal de blanco del Hospital San Pablo (Asunción, Paraguay), de ambos sexos, quienes aceptaron voluntariamente participar de una encuesta de factores de riesgo para el desarrollo de durante el período de julio a diciembre de 2017. Resultados: se encontró una elevada frecuencia de factores de riesgo para en una población joven y dedicada al cuidado de la comunidad. En cuanto a la evaluación de conocimientos de los encuestados, todos describían la influencia negativa de los factores de riesgo, desconociendo ciertas peculiaridades sobre aspectos relacionados con el consumo de hidratos de carbono simples o complejos o el valor de sus niveles de lípidos. En cuanto a la percepción sobre el peso y la actividad física, manifestaron su preocupación. Conclusiones: se halló una elevada frecuencia de factores de riesgo para desarrollar prediabetes. En cuanto a la evaluación de conocimientos de los encuestados, todos describían la influencia negativa de los factores de riesgo, desconociendo ciertas peculiaridades sobre aspectos relacionados con el consumo de hidratos de carbono simples o complejos o el valor de sus niveles de lípidos

ABSTRACT Introduction: The important risk factors for the development of type 2 diabetes are obesity, dyslipidemia and hyperglycemia. The increase in the frequency of chronic noncommunicable diseases is a worldwide phenomenon and Paraguay is no exception. Objectives: To determine the frequency of developing prediabetes with respect to dietary patterns, identifying disorders in the metabolism of carbohydrates in health personnel, taking into account working hours and eating attitudes. Methodology: Analytical, prospective, observational and cross-sectional study. Study focused on the health staff of the San Pablo Hospital (Asunción, Paraguay), males and females, who voluntarily agreed to participate in a survey of risk factors for development during the period from July to December 2017. Results: A high frequency of risk factors was found in a young population dedicated to community care. In relation to the evaluation of the knowledge of respondents, all described the negative influence of the risk factors, ignoring certain peculiarities about aspects related to the consumption of simple or complex carbohydrates or the value of their lipid levels. Regarding the perception of weight and physical activity, they expressed concern. Conclusions: A high frequency of risk factors was found to develop prediabetes. Regarding the evaluation of the knowledge of respondents, all described the negative influence of risk factors, ignoring certain peculiarities about aspects related to the consumption of simple or complex carbohydrates or the value of their lipid levels.

Evaluación diagnóstica y manejo terapéutico farmacológico en pacientes con fibrilación auricular / Diagnostic evaluation and pharmacological therapeutic management in patients with atrial fibrillation

La fibrilación auricular (FA) es la arritmia sostenida más frecuente que puede presentarse en una amplia variedad de condiciones clínicas. A pesar de los progresos en el tratamiento de los pacientes con FA, esta arritmia sigue siendo una de las más importantes causas de accidente cerebrovascular, insuficiencia cardiaca, muerte súbita y morbilidad cardiovascular en todo el mundo. El objetivo del tratamiento con fármacos antiarrítmicos es mejorar los síntomas relacionados con la FA, y buscar un equilibrio entre la carga sintomática, la posibilidad de reacciones farmacológicas adversas y las preferencias del paciente. El control de la frecuencia cardiaca a corto y largo plazo se puede lograr con bloqueadores beta, digoxina, bloqueadores de los canales del calcio o tratamiento combinado. Si bien otros fármacos antiarrítmicos de clase III también tienen un efecto limitador de la frecuencia, solo deben emplearse para el control del ritmo cardiaco. Restaurar y mantener el ritmo sinusal también es una parte integral del tratamiento de la FA. Los fármacos antiarrítmicos de clase III duplican la tasa de pacientes en ritmo sinusal. El tratamiento para el control del ritmo está indicado para mejorar los síntomas de los pacientes con FA que siguen sintomáticos a pesar del tratamiento adecuado para el control de la frecuencia cardiaca. La combinación de antiarrítmicos que prolongan el intervalo QT no se debe emplear para el control del ritmo cardiaco en la FA(AU)

Atrial fibrillation (AF) is the most frequent sustained arrhythmia that can occur in a wide variety of clinical conditions. Despite progress in the treatment of patients with AF, this arrhythmia remains one of the most important causes of stroke, heart failure, sudden death and cardiovascular morbidity worldwide. The aim of treatment with antiarrhythmic drugs is to improve the symptoms related to AF, and to look for a balance between the symptomatic load, the possibility of adverse pharmacological reactions and the patient preferences. The short and long term heart rate control can be achieved with beta blockers, digoxin, calcium channel blockers or combination therapy. Although other class III antiarrhythmic drugs also have a frequency-limiting effect, they should only be used for the control of heart rhythm. Restoring and maintaining sinus rhythm is also an integral part of the treatment of AF. Class III antiarrhythmic drugs double the rate of patients who maintain their sinus rhythm. Treatment for rhythm control is indicated to improve the symptoms of patients with AF who remain symptomatic despite adequate treatment for heart rate control. The combination of antiarrhythmics that prolong the QT interval should not be used to control heart rhythm in AF(AU)

Myocardial Fibrosis as a Pathway of Prediction of Ventricular Arrhythmias and Sudden Cardiac Death in Patients With Nonischemic Dilated Cardiomyopathy.

The mechanism of sudden cardiac death (SCD) in patients with nonischemic dilated cardiomyopathy (NIDCM) is mostly due to sustained ventricular tachycardia and ventricular fibrillation. The clinical guidelines for the therapeutic management of this set of patients are mostly based on left ventricular ejection fraction value which has a low specificity to differentiate the risk of SCD from the risk of mortality associated with heart failure or other comorbidities. Moreover, since SCD can occur in patients with normal or mildly depressed ejection fraction, it is necessary to identify new markers to improve the prognostic stratification of SCD. Several studies that analyzed the ventricular arrhythmia substrate found that myocardial fibrosis plays an important role in the genesis of ventricular arrhythmias in patients with NIDCM. The surrounding zone of the area of fibrosis is a heterogeneous medium, where tissue with different levels of fibrosis coexists, resulting in both viable and nonviable myocardium. This myocardial fibrosis may constitute a substrate for ventricular arrhythmias, where slow and heterogeneous conduction may favor the genesis of reentry mechanism increasing the chance to develop sustained ventricular tachycardia or ventricular fibrillation. Therefore, the evaluation of ventricular fibrosis by late gadolinium enhancement (LGE) cardiac magnetic resonance imaging has been suggested as an indicator for SCD risk stratification. Indeed, LGE in patients with NIDCM is associated with increased risk of all-cause mortality, heart failure hospitalization, and SCD. Detection of myocardial fibrosis as LGE by cardiac magnetic resonance imaging can be considered as a useful pathway of prediction of malignant ventricular arrhythmias since it has excellent prognostic characteristics and may help guide risk stratification and management in patients with NIDCM.

Amiodarone-Induced Third Degree Atrioventricular Block and Extreme QT Prolongation Generating Torsade Des Pointes in Paroxysmal Atrial Fibrillation.

Amiodarone is still the most potent antiarrhythmic drug in the prevention of life threatening ventricular arrhythmias and demonstrates a very low incidence of torsade de pointes. An unusual case of an 81-year-old woman who developed serious abnormalities of the conduction system of the heart and torsade des pointes during intravenous infusion of amiodarone for the treatment of paroxysmal atrial fibrillation is described. To the best of our knowledge, this is the first case showing an association of intravenous amiodarone-induced third degree atrioventricular block and extreme QT interval prolongation generating torsade des pointes in a patient with paroxysmal atrial fibrillation who required an implantable cardioverter-defibrillator. Currently, amiodarone is still one of the few remaining treatment options for the medical therapeutic management of serious ventricular arrhythmias and to reduce the incidence of atrial fibrillation without increasing mortality or sudden cardiac death rates in heart failure patients like our elderly present patient. Nevertheless, we have to keep in mind that intravenous amiodarone may generate serious abnormalities of the conduction system of the heart and lethal ventricular arrhythmias in certain patients.

Chiapas e o Zapatismo: da humilhação à dignidade / Chiapas and the Zapatismo: from humiliation to dignity

O tema central do presente trabalho é o Zapatismo em Chiapas, México. Através desta análise, chamo a atenção para os seguintes pontos: 1) Os Movimentos Sociais constituem fenômenos compostos por elementos que correspondem tanto às instâncias de índole objetiva, coletiva, racional, como as de natureza subjetiva, individual, emocional. Por isso, é indispensável que as abordagens que se realizem sobre eles, visando à sua verdadeira compreensão, de fato assim os considerem, a fim de não perpetuarem a antiga cisão estabelecida entre estas esferas, pelo conhecimento tradicional. 2) O Movimento Zapatista é um excelente exemplo de como fatores de caráter afetivo dão consistência a uma poderosa força capaz de motivar, manter e desenvolver a existência de uma organização social. 3) No caso do EZLN, esses aspectos de ordem emocional, transitaram por um processo que abrange desde a experiência (secular a partir dos antepassados dos seus membros e ainda presente para estes) de ter sofrido uma humilhação com raízes e faces múltiplas, até a vivência de fazer valer sua dignidade humana. 4) Essa dinâmica é expressa tanto na prática como no discurso do EZ, através das vias do confronto ou da solidariedade, conforme o lugar que os outros sujeitos com os quais se relaciona ocupam na estrutura social. Conseqüentemente essa posição orienta por sua vez a atitude que eles adotam em relação aos Zapatistas e viceversa, bem como a qualidade da afetividade possível entre eles (AU)

Uma abordagem da psicologia social a respeito dos movimentos populares

Estuda uma aproximação aos novos movimentos populares através da psicologia social, e a mobilização dos moradores de um bairro periférico da Grande São Paulo, no contexto da pré-escola de 1985 a 1988. Explora o papel do sujeito e do psicólogo na dinâmica de um movimento popular, onde a maioria dos Ss são mães que buscam captar suas vivências a respeito desse movimento. Fundamenta-se em concepções básicas da pesquisa participante, em conceitos da pesquisa qualitativa, e como recurso, na informação viva. Conclui que: na mobilização existem diversas modalidades de participação, que vão de uma ativa a outra distante até a quase indiferente; também encontra a não participação, a qual aparece como um dado mais inquietante do que se espera; a cada um destes modos diferentes de participar, correspondem peculiares histórias de vida, motivações, percepções, atitudes e lembranças; por trás dessas últimas questões, se vislumbram elementos psicológicos mais profundos tanto quanto decisivos: representação social, auto-estima e afeto, os quais são bastante complexos e requerem uma pesquisa própria, da qual esta pode ser o ponto de partida (AU)