Dear colleagues, On behalf of the Working Group on Cardiac Arrhythmias and Electrical Stimulation, as part of the Macedonian Cardiology Association and on behalf of the Cardiology Clinic – Arrhythmias Team, we are pleased to invite you to participate in the First International Symposium on Arrhythmias – RhythmMk 2025 – New Millennium in Electrophysiology and cardiac electrostimulation, which will be