An extracorporeal blood treatment apparatus comprises: a blood treatment device (2)； an extracorporeal blood circuit comprising a blood withdrawal line (6) and a blood return line (7) coupled to the extracorporeal blood treatment device (2), wherein the blood return line (7) presents a heating zone (14) coupled or configured to be coupled to a blood warmer (15)； a blood pump (6) configured to be coupled to a pump section of the blood withdrawal line (6)； at least a post-infusion line (13, 13′；) connected to the blood return line (7) upstream of the heating zone (14)； an air trapping device (9) placed on the blood return line (7) upstream of the heating zone (14).
