Fluke-biomedical MPS450 User Manual download pdf (Page 72)

MPS450

Operators Manual

2-40

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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 three types of preconfigured waveforms for a periodic FHR that

is interactive with uterine contractions: early deceleration; late deceleration; or

acceleration:

• 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 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.

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Fluke-biomedical MPS450 User Manual Page 72