Patent ID: 8551342

Claim:
A method of operating a blood treatment apparatus for the extracorporeal blood treatment of a patient (P), comprising: obtaining a value (RBV) relating to (a) the blood volume at least at one point of time of the blood treatment or (b) a change in the blood volume through at least two points of time of the blood treatment; obtaining a statement (P a-ex , P v-ex ) concerning (a) a pressure prevailing in a portion of the blood treatment apparatus or in an extracorporeal circulation or (b) a change in the pressure prevailing in the portion of the blood treatment apparatus or in the extracorporeal circulation; determining the presence of a coincidence between the change in the blood volume and the change in the pressure, the determination being based on (a) the value (RBV) and the statement (P a-ex , P v-ex ) and/or (b) a change in the value (RBV) and a change in the statement (P a-ex , P v-ex ).