Glossary - Fresenius Medical Care 2008K Operator's Manual

Appendix C
Appendix C

Glossary

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.
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 2008K 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.
+
—The prescribed base sodium level for the dialysate, viewable in the SVS subscreen.
Base Na
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 Touch Screen that can be touched and will cause an action by the
software.
BVM (Blood Volume Monitor)—This is an optional module that can measure the relative
fraction of blood cells within the circulating fluid. It can be used to estimate how the machine's
ultrafiltration rate relates the fluid refilling rate from the extra-cellular compartments. If
ultrafiltration rate is excessive compared to the refilling rate, a hypotensive event is more likely.
Bypass Mode—Bypass mode occurs when the dialysate goes outside alarm limits for
temperature or conductivity. In bypass mode, valves inside the 2008K redirect the flow of
dialysate to bypass the dialyzer internally until temperature and conductivity are back within
acceptable limits.
Compliance Chamber—A blood-holding receptacle similar to a drip chamber. Compliance
chambers are part of the arterial bloodline used in single-needle dialysis.
Conc—Abbreviation for "concentrate."
202 2008K Operator's Manual rev. K