During Treatment; Online Pressure Holding Test - Fresenius Medical Care 2008T Operator's Manual

Chapter 4—Monitoring the Treatment
The pressure readings on the graph are represented by vertical lines with ticks at the top and
bottom signifying the systolic and diastolic pressures respectively. The first pressure reading
is displayed on the left side of the graph with subsequent readings appearing to the right. The
table on screen displays a maximum of 10 pressure readings at a time.
example, if the tests were scheduled at 15-minute intervals, and a manual test was taken five
minutes after the first test, the next test will still occur 15 minutes after the first one. The
results of both automatic and manual tests are displayed in the table. Results appear in the
graph only after the Tx Clock is started.
Note: For accurate blood pressure readings, the cuff must be the proper size and positioned
at heart level. Each centimeter above or below the heart that the cuff is positioned, will
result in a reading error of 0.8 mm Hg. Tests taken with the Tx Clock paused do not show
up on graph.

During Treatment

Online Pressure Holding Test

The online Pressure Holding Test (PHT) automatically checks the integrity of the dialysate
balancing system during dialysis when the dialyzer is connected. The online PHT detects
most leaks in the hydraulics that would affect the precise volumetric control of fluid in the
dialysate system.
The online PHT complements the self-test sequence; it is not a substitute. It is still necessary
to perform the initial Automatic Test Sequence before each high flux treatment.
The online PHT runs every 12 minutes regardless of the other alarm conditions. Dialysate
flow must be on and the machine cannot be executing a filling program or OLC test. The test
runs for two balancing-chamber cycles (about seven seconds). The message " RUNNING
ONLINE PHT " displays during the test. Before the test, the UF pump stops in the middle of
a cycle and remains off during the two balancing chamber cycles of the online PHT. The UF
green light will flash during this time. The machine is in bypass mode during the test period.
The displayed TMP during this time represents pressure within the hydraulics, therefore, the
TMP reading may change slightly. The TMP alarm limits are spread during the test.
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The Stat/Deflate key, located on the right side of the control panel, can be
used to quickly relieve the pressure from an inflated blood pressure cuff. It
will also start an unscheduled blood pressure reading if the cuff is deflated.
Unscheduled tests do not have any effect on the scheduled tests. For
2008T Machine Operator's Manual P/N 490122 Rev N