A new electrophysiologic triad for identification and localization of the critical isthmus in atrial flutter Pedro Adragão; Daniel Matos; Francisco Moscoso Costa; Pedro Carmo; Diogo Cavaco; Gustavo Rodrigues; João Carmo; Francisco Morgado; Miguel Mendes;

Cardiac arrhythmias in patients presenting with COVID-19 treated in Portuguese hospitals: A national registry from the Portuguese Association of Arrhythmology, Pacing and Electrophysiology Dinis Mesquita; Pedro Carmo; Nuno Cabanelas; Nuno Santos; Vítor Martins; Victor Sanfins; Helena Cristina Costa; José Paulo Fontes; Paulo Fonseca; Leonor Parreira;

Impact of catheter ablation for atrial fibrillation in patients with heart failure and left ventricular systolic dysfunction Joana Maria Ribeiro; Pedro A. Sousa; Natália António; Rui Baptista; Luís Elvas; Sérgio Barra; Lino Gonçalves;