Genetic Characterization of Patients With Arrhythmia-Induced Cardiomyopathy

The goal of this observational study is to learn about the genetic insights of arrhythmya-induced cardiomyopathy and its clinical prognosis. The main questions it aims to answer are: I. Does patients with arrhythmia-induced cardiomyopathy have a greater proportion of genetic mutations compared with other types of cardiomyopathy or general population? II. Have the genetics any prognostic impact in patients with arrhythmia-induced cardiomyopathy?

Inclusion Criteria: * Presence of atrial fibrillation or atrial flutter not self-limited. * Performance of a cardiac imaging test with systolic function analysis (echocardiogram, magnetic resonance, CT scan) during the clinical course of the arrhythmia, exhibiting a left ventricular ejection fraction (LVEF) \7 standard alcoholic beverages per day. * Active treatment with chemotherapeutic agents or radiation therapy to the thorax. * Known infection with Trypanosoma cruzi, Borrellia burgdorferi or other infectious agent causing cardiomyopathy.