MPS450
Operators Manual
2-40
3. Select FHR repeatedly to scroll to a different fetal heart rate. The FHR setting
identified on the LCD screen is active when displayed and remains active until the
setting is changed. (Fixed settings do not affect IUP simulations, since they set their
own rates.)
Alternatively, in the Numeric-Control Mode, press the number keys for a fixed fetal-
heart-rate setting listed in Table 2-32, and select RUN:
Table 2-32. Numeric Codes for Heart-Rate Settings
FHR Setting Numeric Code
60 BPM 409
90 BPM 410
120 BPM 411
140 BPM 412
150 BPM 413
210 BPM 414
240 BPM 415
Simulating a Periodic FHR With Intrauterine Pressure (IUP)
The MPS450 sends waveforms to simulate intrauterine pressure during a contraction of
the uterus in childbirth. The duration of each IUP wave is 90 seconds, generating a bell-
shaped pressure curve that rises from zero to 90 mmHg and returns back to zero. During
an IUP-wave simulation, the fetal heart rate (which always begins at 140 BPM) varies
with the blood pressure; the LCD screen displays both values as they change.
The IUP period is adjustable to four preconfigured settings, including a single contraction
that is triggered manually, as well as waveforms that automatically simulate a contraction
generated once every 2, 3, or 5 minutes.
The MPS450 simulates four types of preconfigured waveforms for a periodic FHR that is
interactive with uterine contractions: uniform deceleration; early deceleration; late
deceleration; or uniform acceleration:
With uniform deceleration, the change in fetal heart rate lags the change in intrauterine
pressure by 30 seconds. FHR starts at 140 BPM, slows to 100 BPM, and returns to 140 BPM.
With early deceleration, the fetal heart rate follows the intrauterine pressure (no lag). FHR
starts at 140 BPM, slows to 100 BPM at intrauterine-pressure peak, and returns to 140 BPM as
the IUP falls back to zero.
With late deceleration, the change in fetal heart rate begins when IUP pressure is at its peak
and lags the change in intrauterine pressure by 45 seconds. FHR starts at 140 BPM, slows to 100
BPM, and returns to 140 BPM.
With uniform acceleration, the change in fetal heart rate lags the change in intrauterine
pressure by 30 seconds. FHR starts at 140 BPM, increases to 175 BPM, and returns 140 BPM.
Action in the Menu-Control Mode
1. Press the top-menu key labeled MORE.
2. Select FETAL MATR.
3. Select PER to scroll to a different contraction-period setting.
4. Select IUP to scroll to the desired wave simulation: UNIF DEC (uniform
deceleration); EARLY DEC (early deceleration); LATE DEC (late deceleration); or
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