Fresenius Medical Care 2008K Operator's Manual page 234

Glossary
Kecn—Effective Clearance as determined with conductivity measurements. The calculated clearance
based on the change in conductivity of the pre-dialyzer versus post dialyzer dialysate. Kecn appears in the
"OLC Data" subscreen of the "Kt/V AF" screen.
Keys—Are located on the control panel, outside the touch screen. Keys are used to enter numbers,
confirm selections on the Touch Screen, and activate certain functions.
KoA—Overall mass transfer coefficient multiplied by surface area of a dialyzer.
Kt/V—A measure of therapy delivered to the patient. (K = clearance rate, t = time, V = urea distribution
volume). The Kt/V value shown are Single Pool Values (spKt/V). The OLC system is used to determine
the effective dialyzer clearance used for this determination.
KUF—An ultrafiltration coefficient that describes how permeable a dialyzer is to water. It is a direct
function of surface area and is defined as the number of millimeters of fluid per hour that are transferred
across the membrane per mmHg TMP.
Long Power Down—The act of turning off the machine for longer than two minutes. Certain
information stored in memory is lost after two minutes, and some treatment parameters are reset to their
default settings. Power failures are not the same as long power downs, and treatment data are saved when
power to the machine is interrupted in such instances. See also Short Power Down and Power Failure
Recovery)
Numeric KoA—See KoA.
OLC (Online Clearance)—This is an optional system that can determine the effective conductive
clearance of a dialyzer up to six times during dialysis.
Override—All protective systems are in operation during treatment. During a blood leak alarm, the user
has the option to temporarily suspend (override) a protective system by pressing and holding the RESET
key for three seconds. During a blood leak override, the machine's blood leak monitor is inactive for
three minutes. The Status Box will indicate a blood leak override is in effect.
Positive Pressure—Condition that exists when air or fluid pressure inside the dialysate lines is greater
than outside of the lines. If an opening occurs, air or fluid will flow out of the system.
Post-Reaction Bicarbonate—The prescribed Final Dialysate bicarbonate that will be delivered to the
dialyzer in the Final Dialysate after the proportioning (mixing) of the acid concentrate, bicarbonate
concentrate, and water. The post-reaction bicarbonate value is entered on the "Dialysate" screen in the
Bicarbonate button.
Power Failure Recovery—when power to the machine is lost, many dialysis parameters are stored and
recovered when the power is restored to the machine.
Pressure Holding Test (PHT)—There are different Pressure Holding Tests. A PHT verifies the integrity
of the hydraulic system, which is necessary for accurate fluid balance and UF control. An extensive
Pressure Holding Test is available in Self Test. An Online Pressure Holding Test is done every 12
minutes during treatment. It lasts about seven seconds, depending on the dialysate flow rate (two cycles
of the balancing chamber). The online PHT must be selected in Service Mode.
Pure Ultrafiltration—A treatment option in which the ultrafiltration pump draws excess fluid off the
patient while the dialysate flow is turned off. See also Sequential Dialysis.
234 2008K Hemodialysis Machine Operator's Manual Rev P