Fresenius Medical Care 2008K Operator's Manual page 233

Glossary
Bypass Mode—Bypass mode occurs when the dialysate goes outside alarm limits for temperature or
conductivity. In bypass mode, valves inside the 2008K hemodialysis machine redirect the flow of
dialysate to bypass the dialyzer internally until temperature and conductivity are back within acceptable
limits. The 2008K hemodialysis machine can be manually put into bypass mode by lifting the shunt door.
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."
Dialysate—Aqueous fluid containing electrolytes and usually buffer and glucose, which is intended to
exchange solutes with blood during hemodialysis. This is the Final Dialysate, See Final Dialysate for
more information.
DIASAFE Plus filter—A filter that is placed in the dialysate fluid path after the addition of the acid and
bicarbonate concentrates, shortly before the dialysate is delivered to the dialyzer. It substantially reduces
the level of bacteria and endotoxin (pyrogenic material) in the dialysate.
eKt/V—Equilibrated Kt/V or double pool Kt/V. This accounts for rebound of urea after the treatment is
stopped. The shorter the treatment time, the greater the percentage difference between spKt/V and eKt/V.
We use the Tattersall formula to calculate eKt/V
Fill Program—Occurs when water level in the air separation chamber gets too low. The air separation
chamber is part of the hydraulic system inside the 2008K hemodialysis machine. This program is used to
remove excessive air from the hydraulic system. The machine will normally go into a Fill program when
the dialyzer is first connected to the dialyzer lines, and the air within the dialyzer is being purged.
Repeated Fill programs during operation, however, could indicate a leak in the dialysate delivery system,
and should be brought to the attention of a qualified technician.
Final Dialysate—The prescribed dialysate that is delivered to the dialyzer (patient) by the hemodialysis
machine after the proportioning (mixing) of the acid concentrate, bicarbonate concentrate, and water. The
final dialysate may also be referred to as the post-reaction dialysate (i.e. after proportioning (mixing) of
the acid concentrate, bicarbonate concentrate and water by the dialysis machine).
Flow Indicator—A clear, cylindrical section of the dialyzer supply line that allows observation of the
dialysate flow. When the dialysate flow is on, a small float inside the cylinder bobs up and down in
rhythm to the dialysate pump. When the flow is off, the float sinks to the bottom of the cylinder.
Hard Limits—Unchangeable limits that are hard coded in the software and define the maximum and
minimum, alarm-window values for the arterial, venous, and transmembrane pressures, and the dialysate
temperature and conductivity. Hard limits are not apparent unless the user attempts to set a value outside
the hard limit range.
Hemolysis—Rupture of red blood cells. This may be caused by hyponatremia (low blood sodium),
dialysate that is too hot or too dilute (hypotonic), chloramines, copper, or nitrates in dialysate water,
bleach in the dialysate, low dialysate conductivity, too-high arterial pressure or kinked blood tubing.
Idle Mode—When dialysis is first entered after a long power down, if a water alarm (temperature or
conductivity) exists, the dialysate flow will be 800 ml/min until the machine is up to temperature and
conductivity. The dialysate flow then drops to 300 ml/min while the machine is "idle". The machine will
also enter Idle Mode after a treatment is finished (RTD = 0, blood not sensed, and Blood Pump stopped,
and the dialysate flow rate > 300 ml/min). This mode is terminated when treatment is started (RTD > 0 or
blood sensed by the optical detector) or the dialysate flow rate is changed manually.
2008K Hemodialysis Machine Operator's Manual Rev P 233