The most common cardiac arrhythmia, atrial fibrillation (AF), is estimated to affect ∼2% of the worldwide population and is expected to impact more people as the population ages.– This scenario is not different in Brazil, where ∼2.5% of the population is projected to be affected by AF., The situation is more alarming among pulmonary hypertension patients, in which ∼30% may present AF episodes and ∼70% atrial flutter., Hence, a better understanding of the mechanisms and substrates of AF is constantly […]