Cadence II Fetal Monitor Service Manual
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clearly identify the fetal presenting part.
④ Holding the drive handle, ensure the spiral electrode is retracted approximately one
inch (2.5 cm) from the distal end of the guide tube.
⑤ Place the guide tube firmly against the identified presenting part.
⑥ Maintain pressure against the fetal presenting part with guide and drive tubes. Turn
the drive tube by rotating the drive handle clockwise until gentle resistance is
encountered. Resistance to further rotation and recoil of the drive handle indicates
attachment. This will usually occur after one complete rotation.
⑦ Release the electrode wires from the handle notch and straighten them. Slide the
drive and guide tubes off the electrode wires.
⑧ Insert the safety cap into fetal ECG cable.
5.3 Dual Heart Rate Monitoring
Simultaneous monitoring of twins using two ultrasound channels (see section 5.1 for
the operation) or using one ultrasound channel (see section 5.1 for the operation)
and the DECG (during labor) channel (see section 5.2 for the operation).
Notes: ① The monitoring results are two different fetal heart rates. If the two channels
record the same fetal heart rate, one ultrasound transducer must be moved
till the second fetal heart rate is found.
② In order to distinguish the two fetal heart rates recorded by different channels,
the offset of FHR2/DECG trend is –20bpm. –20bpm means that
FHR2/DECG trend is 20bpm lower than its actual position, so 20bpm should
be added when calculating the numerical value of FHR2/DECG.
③ If two ultrasound channels are used to monitor the twins, only the audio
signals of one fetus can be heard. Press the key to hear the audio
signals of the other fetus.
④ If one ultrasound channel and one DECG channel are used to monitor the
twins, the audio signals of twins can be heard simultaneously.
⑤ Avoid mistaking maternal heart rate for the fetal heart rate.
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