De novo versus upgrade cardiac resynchronization therapy: A different patient population and outcome?

Merkely, Béla ✉ [Merkely, Béla Péter (Kardiológia), author] Cardiovascular Center (SU / FM / C); Department of Cardiology – Heart and Vascular C... (SU / FM / C); Faculty of Sports Medicine (SU / FM / C); Aerospace Medicine Department (SU / FM / C); Kosztin, Annamária [Kosztin, Annamária (orvostudományok), author] Cardiovascular Center (SU / FM / C); Department of Cardiology – Heart and Vascular C... (SU / FM / C)