plasma potassium concentrations in the Fluid Management System (FMS) reservoir, arterial blood, and central venous blood

During bolus transfusion (300ml) of blood mixture, blood sample is taken from the side port of infusion line of Fluid Management System (FMS) when 150 ml of blood mixture was transfused. Because the priming volume of the internal circuit is approximately 100 ml, blood sample that was taken after 150 ml transfusion represents the content in the reservoir.

Just before transfusion starts, blood samples are taken from the central venous catheter and arterial line at the same time to measure baseline values. At the immediate end of transfusion, blood samples are taken again from the same sites to measure the resultant changes.