Chapter 3—Setting Treatment Parameters
2008K Hemodialysis Machine Operator’s Manual Rev P
83
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 69.
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, touch
Start
Na
+
. The values in the left column change to reflect the increased sodium (see Figure 38 on
page 80). Touch
Base Na
+
to observe the constituents at the base concentration. The arrow
indicates which of the Na
+
concentrations corresponds to the values. If neither button is
highlighted, the electrolyte constituents values default to the Base Na
+
setting, as indicated by
the arrow.
Operation
Once the SVS program is started, the maximum sodium level (Start Na
+
) is reached after
about three minutes. The theoretical conductivity (TCD) will immediately adjust to the
expected conductivity for the selected Na
+
level. As the actual conductivity rises, the alarm
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
+
level is reached.
If an SVS program is in progress, pressing the
SVS on/off
key on the control panel will pause
the program. The conductivity will return to the Base Na
+
level and the SVS-Time
countdown stops. Alarms may occur as the conductivity stabilizes. The operator has two
options:
Restarting the program by pressing the
SVS on/off
key on the control panel. The
SVS-
Time
and
Start Na
+
may need to be adjusted.
Terminate the program by touching the
SVS Time
button on the “SVS Profile”
subscreen, entering zero using the data entry keypad, and pressing
CONFIRM
or by
changing profile to “None” and pressing
CONFIRM
.
