The Electrolyte Constituents; Operation - Fresenius Medical Care 2008T Operator's Manual

Chapter 3—Setting Treatment Parameters
Note: During the SVS program, the actual conductivity bar, shown in bar graph on the
Dialysate screen, should be centered in the alarm window. This may require shifting the
position of the upper and lower alarm limits using the Alarm Position button. See
"Conductivity Limits" on page 72.
Note: If any SVS parameter is changed after the program has started (SVS must be turned
off to change), a new SVS program is initiated with the displayed SVS time and SVS start
+
Na .

The Electrolyte Constituents

The acid concentrate is the major source of electrolytes in the dialysate. Increasing the Na
concentration in the dialysate, therefore, increases the amount of acid concentrate.
Increasing the amount of acid concentrate also increases the concentration of the other
electrolytic constituents. These changes can be observed in the electrolyte constituents shown
in the left side of the "SVS Profile" subscreen.
To observe the electrolyte constituents for the higher concentration of sodium, select Start
+
Na . The values in the left column change to reflect the increased sodium (see Figure 39 on
page 83). Select Base Na
indicates which of the Na
highlighted, the electrolyte constituents values default to the Base Na
the arrow.

Operation

Once the SVS program is started, the maximum sodium level (Start Na
about three minutes. The theoretical conductivity (TCD) will immediately adjust to the
expected conductivity for the selected Na
window will also track upward, to within the maximum conductivity alarm window limit of
0.5 mS/cm above TCD. While the alarm window is rising, the TCD may be outside of the
alarm limits. The machine, however, may not be in an alarm state because the limits are
tracking the actual conductivity. After the tracking is complete, the alarm window moves
automatically to the expected conductivity based on the selected parameters and starting
alarm limits. The SVS Time starts counting down when the Start Na
If an SVS program is in progress, selecting and confirming the None profile will pause the
program. The conductivity will return to the Base Na
stops. Alarms may occur as the conductivity stabilizes. The operator has two options:

Restarting the program by re-selecting the desired SVS Profile and pressing the
CONFIRM key. The SVS-Time and Start Na

Terminate the program by selecting the SVS Time button on the "SVS Profile"
subscreen, entering zero using the Keyboard, and pressing Enter/CONFIRM or by
changing profile to "None" and pressing CONFIRM
86
+
to observe the constituents at the base concentration. The arrow
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concentrations corresponds to the values. If neither button is
+
level. As the actual conductivity rises, the alarm
2008T Machine Operator's Manual P/N 490122 Rev N
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setting, as indicated by
+
) is reached after
+
level is reached.
+
level and the SVS-Time countdown
+
may need to be adjusted.
+