Extracorporeal blood treatment machine, computer-implemented detection method, and computer program

An extracorporeal blood treatment machine for extracorporeal blood treatment of blood of a patient, the extracorporeal blood treatment machine comprising:

• a dialyzer with a semipermeable membrane;
• a shunt having an arterial shunt section and a venous shunt section;
• an extracorporeal blood circuit with a blood pump adapted to convey a fluid through the dialyzer, the extracorporeal blood circuit extending from an arterial section, which is supplied for connecting to an arterial section, via a blood inlet of the dialyzer, on a blood side of the semipermeable membrane through the dialyzer, via a blood outlet of the dialyzer and to a venous section, the venous section configured for connecting the venous shunt section;
• a dialysis fluid circuit which is adapted to supply fresh dialysis fluid, to convey it through the dialyzer and to discharge used dialysis fluid or dialysate, and which extends from a dialysis fluid supply of the extracorporeal blood treatment machine to a dialysis fluid inlet of the dialyzer, on a dialysis fluid side of the semipermeable membrane through the dialyzer, to a dialysate outlet of the dialyzer and to a dialysate sink of the extracorporeal blood treatment machine;
• a blood property recording unit, which is adapted to record a blood property in the extracorporeal blood circuit, and/or a dialysate property recording unit, which is adapted to record a dialysate property at the dialysate outlet;
• and
• a control unit connected to the blood property recording unit and/or the dialysate property recording unit,
• the extracorporeal blood treatment machine being configured, in preparation for extracorporeal blood treatment, to:
• prime or flush the extracorporeal blood circuit with a priming fluid from the arterial section to the venous section,
• request a connection of the arterial shunt section to the arterial section filled by priming or flushing with priming fluid by operating personnel and/or ascertaining this connection,
• request a connection of the venous shunt section to the venous section filled by priming or flushing with priming fluid by operating personnel and/or ascertaining this connection, and
• at least one of detect, quantify or check a recirculation and/or a recirculation rate at the shunt depending on the blood property and/or dialysate property recorded after the connection of the venous shunt section.