Working Group on Arrhythmias and Cardiac Pacing and Croatian Cardiac Society, on April 29th and 30th, 2016 in Opatija organizes the traditional 17th Symposium on Arrhythmia and Cardiac Pacing – CroRhythm 2016, which is, for many years, attended by a large number of cardiologists, internists and family physicians as well as young specialists of different specializations.