Mauricio Scanavacca1, Cristiano F Pisani2. 1. Arrhythmia Clinical Unit, Heart Institute, University of São Paulo Medical School, Av Dr. Eneas Carvalho de Aguiar, 44, CEP 05403-000 Sao Paulo, Brazil mauricio.scanavacca@gmail.com. 2. Arrhythmia Clinical Unit, Heart Institute, University of São Paulo Medical School, Av Dr. Eneas Carvalho de Aguiar, 44, CEP 05403-000 Sao Paulo, Brazil.