Fresenius Medical Care 2008K Operator's Manual page 235

Glossary
Reverse Osmosis (RO)—A method for purifying water by forcing it through a semipermeable membrane
that prevents the passing of mineral ions.
RTD—Remaining Time on Dialysis. The amount of time remaining until the end of the treatment. RTD
is viewable in the Home screen.
Screen Access Button—Any of the eight blue buttons located in the row along the bottom of the touch
screen. Pressing one of these buttons will bring up the corresponding treatment screen on the touch
screen.
Sequential Dialysis—A two-stage form of dialysis treatment in which the first stage consists exclusively
of ultrafiltration. In the first stage, there is no dialysate flow while the ultrafiltration pump draws excess
fluid off the patient. After the determined amount of fluid has been drawn, the second stage, usually a
standard dialysis treatment, occurs.
Service Mode—A functional state of the 2008K hemodialysis machine that allows technicians to
calibrate the machine or program various software features and options that are only accessible in Service
Mode.
Single Needle Dialysis—This is a system with the use of two blood pumps to allow blood access to the
patient with a single needle. The pumps alternately turn on and off to pull fluid from the patient and then
return the dialyzed blood with minimal recirculation.
Short Power Down—Refers to the act of turning off the power with the Front Panel Power key to the
machine for less than two minutes. Certain information stored in memory is only stored for up to two
minutes. After that, it is erased. See also Long Power Down and Power Failure Recovery.
Sodium Variation System (SVS)—A program that varies the concentration of sodium in the dialysate
during treatment. Increased sodium at the onset of treatment is sometimes prescribed to prevent cramping
in the patient. Increasing sodium results in increased levels of other electrolytic constituents and a higher
level of conductivity.
SVS Profile—A programmable feature for varying the level of sodium in the dialysate throughout the
course of treatment.
SVS Time—Time length in hours and minutes prescribed for SVS program.
Theoretical Conductivity (TCD)—The expected conductivity of the dialysate based upon the
concentrate type, and sodium and bicarbonate values entered in the Dialysate screen. TCD is measured in
milliSiemens per centimeter (mS/cm) and is corrected to 25 °C.
Transducer—An electronic device inside the 2008K hemodialysis machine that reads the pressure inside
the arterial and venous drip chambers. The drip chamber and transducer are connected via a thin tube that
is part of the extracorporeal blood circuit.
Transducer Protector (TP)—a small, disposable, plastic cap containing a hydrophobic, paper filter that
fits over each pressure port. It is inserted between the pressure monitor line and the pressure port
connection and is used to prevent the transducer from becoming wet or contaminated with blood. There
are two transducer protectors for each connection, a disposable external TP that is to be replaced with
each treatment. A second internal TP is also installed.
Ultrafiltration (UF)—Ultrafiltration is the process of drawing off excess fluid from the patient during
treatment. The 2008K hemodialysis machine hydraulic system is a closed system that uses a separate UF
pump for greater accuracy.
2008K Hemodialysis Machine Operator's Manual Rev P 235