The annual congress of the European Society of Cardiology (ESC Congress) was held in Madrid from August 29 to September 1, 2025. The conference is the largest gathering of cardiologists in the world, attracting more than 33,000 participants this year. Two presentations by Gunnar Þór Gunnarsson, cardiologist at Akureyri Hospital (Sjúkrahúsið á Akureyri – SAk), and his colleagues were featured at the congress.