Revision C 250cx Series Maternal/Fetal Monitor 6-5
2036946-001
Uterine Activity Monitoring: Internal Method - Intrauterine Pressure (IUP)
Internal Method - Intrauterine Pressure (IUP)
NOTE: To secure a strain gauge post for IUP monitoring, refer to the strain gauge
manufacturer’s instructions.
Methodology
An intrauterine pressure catheter (IUPC) inserted transcervically into the uterine
cavity measures intrauterine pressure. You can monitor using either a fluid-filled
catheter or a transducer-tipped catheter. The mode (IUP) and value are shown in the
UA area of the display. The UA value displays from 0–100 in mmHg mode and
0.0 - 13.3 in kPa mode during normal operation. Uterine activity is continuously
plotted on the bottom (or right) grid of the strip chart paper as a plain black line.
Pressure exceeding 100 mmHg (13.3 kPa) is printed as a straight line at 100 mmHg
(13.3 kPa).
Why You Must Zero the System
When you zero the system, you are referencing the pressure to 0 mmHg (0 kPa)
while the system is open to air to ensure an absolute pressure measurement. Refer to
the “Maternal/Fetal Monitoring, Clinical Applications Manual” for more
information.
If you disconnect the patient from the monitor all zeroing information is lost. If
you re-connect the patient to the monitor you must re-zero—regardless of
whether you connect to the same monitor or a different monitor.
If the mother’s position has changed, the baseline may have been altered. If this
is the case, re-zero.
If the message CHECK IUP flashes in the UA display area, there is insufficient
compensation to provide 100 mmHg (13.3 kPa) above the reference level. Re-
zeroing should correct the problem.
If a negative value is displayed (pressure less than 0 mmHg (0 kPa), the
baseline should be re-zeroed. (When a negative value occurs for more than 20
seconds, the message BASELINE PRESSURE OFFSCALE is on the bottom grid on
the strip chart paper.)
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