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3 Department of Cardiology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Silesian Center for Heart Diseases, Zabrze, Poland Department of Electrocardiology, Medical University of Lodz, Łódź, Poland Department of Arrhythmia Institute of Cardiology, Warszawa, Poland 1 Department of Cardiology, Doctoral School, Medical University of Warsaw, Warszawa, Poland Cardinal Stefan Wyszynski University in Warsaw, Warszawa, Poland Department of Cardiology, Congenital Heart Diseases and Electrotherapy, Silesian Center for Heart Diseases, Zabrze, Poland 1 Chair and Department of Cardiology, Medical University of Warsaw, Warszawa, Poland Cardiology Department with the Acute Coronary Syndromes Subdivision, Clinical Provincial Hospital No. 2, Faculty of Medicine, University of Rzeszow, Rzeszów, Poland 1 Department of Cardiology, Poznan University of Medical Sciences, Poznań, Poland Computer Science Laboratory, Silesian Center for Heart Diseases, Zabrze, Poland Department of Dietetics, School of Public Health in Bytom, Medical University of Silesia, Katowice, Poland

Patients with heart failure and an implanted cardioverter-defibrillator during the COVID-19 pandemic: insights from a multicentre registry in Poland