Glossary - Fresenius Medical Care 2008T Operator's Manual

Glossary

Air Lock—A condition caused by air entering the concentrate supply lines when not enough liquid
concentrate is available. Air lock causes dialysate conductivity to be low.
Alarm Window—The allowable range without alarm for the arterial, venous, and transmembrane
pressures, and the dialysate temperature and conductivity during treatment. Transition of either value
outside the window will trigger an alarm. The conductivity alarm window is graphically represented in
the Dialysate screen as the area located between the upper and lower alarm limits of the conductivity bar
graph. The alarm window can be widened or narrowed, or shifted up or down within the hard limits. The
temperature alarm window is  2 C of the set temperature value within the temperature hard limits (30
C to 41 C). The arterial and venous limit window width is also selectable. The position of the window
is set automatically.
Asymmetric Limits—This is an option to select venous limits that are not symmetrical. If asymmetric
limits are chosen, the lower venous limit will tighten to the selected value after a short time delay. The
lower venous limit choices are 20, 25, 30, 35 mmHg. The lowest value that does not cause frequent
nuisance alarms should be chosen.
Auto Flow—A dialysate flow option in which the dialysate flow is proportional and linked to the blood
flow rate. Auto Flow may be approximately either 1.5 times or 2 times the blood flow rate between 300
(or 500 depending on the setup in Service Mode) and 800 ml/min, in 100 ml/min increments. The
dialysate flow rate on the "Home" screen is preceded by the letter 'a' when auto flow has been set.
Back Filtration—The movement of dialysate across the dialyzer membrane and into the patient's blood.
It can be caused by a change in pressure or concentration gradient between the dialysate and the blood.
Balancing Chambers—A hydraulic unit inside the 2008T hemodialysis machine consisting of two
chambers that ensure that the amount of fresh dialysate entering the dialysate flow is equal to the amount
of used dialysate being drained.
+
Base Na —The prescribed base sodium level for the Final Dialysate, viewable in the SVS subscreen.
The default Base Na+ value is carried over from the value entered in the Na+ button in the Dialysate
screen. Changing the value in either button will change the value of the other.
Bic—Abbreviation for "bicarbonate."
Biofilm—Biological residue from treatment that collects on machine drain lines.
Blood Sensed—The venous line runs through an optical detector below the venous line clamp. When the
line is opaque, the machine uses this "Blood Sensed" information for a number of alarm or informational
messages or warnings.
BTM (Blood Temperature Monitor)—This is an optional module that can control or monitor the
temperature and energy supply to the patient. It may be used to determine the recirculation of blood
within the patient's access.
Button—An area on the display screen that can be selected and will cause an action by the software.
276 2008T Machine Operator's Manual P/N 490122 Rev N