Twenty years of vasoplegic syndrome treatment in heart surgery: Methylene blue revised - Evora, Paulo Roberto Barbosa; Alves Júnior, Lafaiete; Ferreira, Cesar Augusto; Menardi, Antonio Carlos; Bassetto, Solange; Rodrigues, Alfredo José; Scorzoni Filho, Adilson; Vicente, Walter Villela de Andrade (Brazilian Journal of Cardiovascular Surgery, 2015)