In the electronic English edition of the article titled in Spanish "Caracterización no invasiva de la actividad auricular durante los instantes previos a la terminación de la fibrilación auricular paroxística," published in the February issue of the Revista Española de Cardiología (Rev Esp Cardiol. 2008;61:154-60) a mistake has been detected in the English title. The correct title should be "Non-Invasive Characterization of Atrial Activity Immediately Prior to Termination of Paroxysmal Atrial Fibrillation."