P1570Upgrading pacemaker vs direct implantation of CRT in heart failure patients: is there a difference in clinical outcomes?. (20th June 2017) - Trepa, M.; Silveira, I.; Baggen Santos, R.; Fontes Oliveira, M.; Brochado, B.; Alves Dias, V.; Pinheiro Vieira, A.; Roque, C.; Lagarto, V.; Reis, H.; Torres, S.