RESUMO
Resumen Fundamento y objetivos: La fibrilación auricular es la arritmia mantenida más común. El estudio pretende conocer la prevalencia de fibrilación auricular en la población general, y evaluar las características y el manejo de los casos con fibrilación auricular no valvular. Métodos: Estudio transversal exploratorio en una muestra de la población de un Departamento de Salud (n = 30.024) de sujetos mayores de 18 años con diagnóstico electrocardiográfico de fibrilación auricular en la historia clínica electrónica de atención primaria. Se analizan características clínicas, manejo y tratamiento. Resultados: De un total de 629 pacientes con diagnóstico de fibrilación auricular, lo que representa una prevalencia del 2,1% (8,06% en > 65 años), fueron seleccionados para el estudio 505 casos con fibrilación auricular no valvular. La edad media fue 77,4 ± 10 años, 55% mujeres. Se objetivó cardiopatía estructural en el 32% de casos e insuficiencia cardiaca en el 29,5%. El 72% de pacientes recibía tratamiento anticoagulante, 60% con antivitamina K y 12% con anticoagulantes directos. Entre los primeros, solo el 53% mantenía un tiempo en rango terapéutico ≥ 65% según el método de Rosendaal. La forma de presentación persistente-permanente fue más frecuente (60,8%), seguida de la paroxística (39,2%). Conclusiones: La prevalencia de fibrilación auricular fue del 2,1%, aumentando con la edad, con elevada proporción de cardiopatía concomitante. La proporción de pacientes anticoagulados y la calidad de la anticoagulación son deficientes, revelándose así la necesidad de mejor monitorización y mayor utilización de nuevos anticoagulantes directos en los casos indicados.
Abstract Background and objectives: Atrial fibrillation is the most common type of constant arrhythmia. The study aims to know the prevalence of atrial fibrillation in the general population and to assess the features and management of non-valvular atrial fibrillation. Methods: Cross-sectional exploratory study of a population sample from a Health department (n=30.024) of individuals over 18 years with electrocardiographic diagnosis of atrial fibrillation in the primary care electronic medical records. Clinical features, management and treatments are analyzed. Results: Out of a total of 629 patients with an atrial fibrillation diagnosis, which represents a 2.1% prevalence (8.06% in >65 years), 505 cases with non-valvular atrial fibrillation were selected for the study. Average age was 77.4 ± 10 years, 55% female patients. Structural heart disease was detected in 32% of the cases, and cardiac failure in 29.5% of the cases. 72% of the patients were receiving anticoagulation therapy, 60% with antivitamin K drugs and 12% with direct anticoagulants. Among the former group, only 53% kept a time within the therapeutic range ≥65% according to the Rosendaal method. The most frequent presentation was persistentpermanent (60.8%), followed by paroxysmal (39.2%). Conclusions: Prevalence of atrial fibrillation was 2.1%, increasing with age, with a high proportion of accompanying heart disease. The proportion of anticoagulated patients and the quality of anticoagulation were poor, thus revealing the need for improved monitoring and wider use of new direct anticoagulants in the indicated cases.
Assuntos
Humanos , Feminino , Idoso , Fibrilação Atrial , Epidemiologia , Atenção Primária à Saúde , Antiarrítmicos , AnticoagulantesRESUMO
BACKGROUND: Amiodarone is an effective medication in preventing atrial fibrillation (AF), but it interferes with the metabolism of warfarin. OBJECTIVES: This study sought to examine the association of major thrombotic clinical events and bleeding with the use of amiodarone in the ARISTOTLE (Apixaban for Reduction in Stroke and Other Thromboembolic Events in Atrial Fibrillation) trial. METHODS: Baseline characteristics of patients who received amiodarone at randomization were compared with those who did not receive amiodarone. The interaction between randomized treatment and amiodarone was tested using a Cox model, with main effects for randomized treatment and amiodarone and their interaction. Matching on the basis of a propensity score was used to compare patients who received and who did not receive amiodarone at the time of randomization. RESULTS: In ARISTOTLE, 2,051 (11.4%) patients received amiodarone at randomization. Patients on warfarin and amiodarone had time in the therapeutic range that was lower than patients not on amiodarone (56.5% vs. 63.0%; p < 0.0001). More amiodarone-treated patients had a stroke or a systemic embolism (1.58%/year vs. 1.19%/year; adjusted hazard ratio [HR]: 1.47, 95% confidence interval [CI]: 1.03 to 2.10; p = 0.0322). Overall mortality and major bleeding rates were elevated, but were not significantly different in amiodarone-treated patients and patients not on amiodarone. When comparing apixaban with warfarin, patients who received amiodarone had a stroke or a systemic embolism rate of 1.24%/year versus 1.85%/year (HR: 0.68, 95% CI: 0.40 to 1.15), death of 4.15%/year versus 5.65%/year (HR: 0.74, 95% CI: 0.55 to 0.98), and major bleeding of 1.86%/year versus 3.06%/year (HR: 0.61, 95% CI: 0.39 to 0.96). In patients who did not receive amiodarone, the stroke or systemic embolism rate was 1.29%/year versus 1.57%/year (HR: 0.82, 95% CI: 0.68 to 1.00), death was 3.43%/year versus 3.68%/year (HR: 0.93, 95% CI: 0.83 to 1.05), and major bleeding was 2.18%/year versus 3.03%/year (HR: 0.72, 95% CI: 0.62 to 0.84). The interaction p values for amiodarone use by apixaban treatment effects were not significant. CONCLUSIONS: Amiodarone use was associated with significantly increased stroke and systemic embolism risk and a lower time in the therapeutic range when used with warfarin. Apixaban consistently reduced the rate of stroke and systemic embolism, death, and major bleeding compared with warfarin in amiodarone-treated patients and patients who were not on amiodarone.