Cadence II Fetal Monitor Service Manual
－ 49 －
5.4 Monitoring Uterine Activity
Use a TOCO transducer to external measure uterine activity, or use an intrauterine
pressure catheter to internal measure uterine activity (Only ruptured membranes
and adequate dilation can the internal contractions be monitored).
5.4.1 Monitoring Contractions (External)
Monitoring of the external contractions is obtained through TOCO transducer on
abdominal wall.
Parts Required
TOCO transduc① er Belt②
Operation Procedure
① Preparing the Monitor
Turn the monitor on and verify that the normal monitoring screen appears on the display.
Check the TOCO transducer to verify proper attachment to the monitor.
Check for the proper setting for TOCO baseline. Adjust when needed.
② Acquiring Uterine Activity Data
Place another belt around the abdomen. Attach the buckle of the TOCO transducer to
the belt.
Do not use coupling gel. Wipe off any gel present on abdomen around this area.
Fix the transducer. The transducer is retained on the midline half-way between the
mother’s fundus and the umbilicus (see Figure 5-1 for the positioning of the external
TOCO).
The uterine activity reading at this point should be greater than 30 units and less than 90
units. If the reading falls outside this range, the belt may be too tight or too loose. If the
belt is over tightened, the contraction peaks may have a flat-top at less than 100 on the
TOCO scale. If the belt is under tightened, the position of the transducer may wander
and cause unusable readings. Readjust the belt pressure as needed.
Monitor Adjustments③
Press the key to adjust the value to the baseline. This should be done during
non-contraction intervals.
To Next Page
Need help?
General