Fluke Biomedical ProSim 2 - Manual (Page 33)

Vital Signs Simulator
Cardiac Functions
21
Fetal/Maternal Function
The Product can simulate fetal and maternal
electrocardiograms (ECG) that occur while in labor.
Pressure waveforms of uterine contractions can also be
simulated.
The fetal/maternal ECG signal is sourced on the ECG
posts of the Product. The maternal signal is a P-QRS-T
wave fixed at 80 bpm with an amplitude that is half the
value of the amplitude parameter. The fetal signal is a
narrow R-wave at full amplitude. The fetal and maternal
signals are combined to make a composite signal.
Simulate Fixed Fetal Heart Rate (FHR)
To set a fixed fetal heart rate:
1. In the Home screen of the Product, push the
navigation buttons to highlight FE/MA .
2. Push  to show the Fetal Maternal screen.
3. Use the parameter selection procedure to set the FHR
parameter.
The set FHR value shown in the display is output and
continues on the output until the value is changed.
How to Simulate a Periodic FHR with Intrauterine
Pressure (IUP)
The Product can simulate intrauterine pressure (IUP) of a
contraction of the uterus in childbirth. The IUP wave is a
bell shaped curve that starts at zero and increases to
90 mmHg and decreases to zero over a 90-second period.
The frequency of contractions can be set to manual, 2, 3
or 5 minutes.
The fetal heart rate starts at 140 bpm and changes with
blood pressure. Fetal heart rate and IUP are shown in the
display.
The Product simulates three preconfigures waveforms for
periodic FHR:
Early deceleration – The fetal heart rate follows the
intrauterine pressure (no lag). FHR starts at 140 bpm,
slows to 100 bpm at the intrauterine pressure peak and
then returns to 140 bpm at the IUP decreases back to
zero.
Late deceleration – The fetal heart rate change starts
when the IUP is at its peak and lags the change in
intrauterine pressure by 45 seconds. FHR starts at
140 bpm, slows to 100 bpm, and then increases back to
140 bpm
Acceleration – The fetal heart rate lags the change in
intrauterine pressure by 30 seconds. FHR starts at
140 bpm, increases to 175 bpm, and then decreases back
to 140 bpm.