13
Operation
Clinical Use
Apply a liberal amount of gel to the abdomen. Place the faceplate of the probe
fl at against the abdomen above the symphysis pubis. Adjust the probe to obtain
an optimum audio signal ideally by angling the probe around. Avoid sliding it
over the skin.
In early pregnancy a full bladder may improve sound detection. In later
pregnancy the best signals are generally located higher on the abdomen. The
fetal heart sounds like a galloping horse at approximately twice the maternal
rate. A wind-like sound is heard from the placenta.
Standard Mode - MD2 Only
In this mode the FHR, averaged over 4-heart beats, is displayed on the 3-digit
readout. The LCD displays an outline heart symbol.
Smoothed Mode - MD2 Only
This mode is used to obtain more stable heart rate readings. In this mode, FHR
is averaged over 8 beats. The LCD displays a solid heart symbol.
Manual Mode - MD2 Only
This mode is used when a fetal heart beat is audible in the loudspeaker or
headphones but, due to noise or a low signal level, the MD2 cannot reliably
calculate the heart rate. In this mode, the heart rate can be manually counted
over a period of 10 audible heart beats (see below). The MD2 will automatically
calculate and display the derived FHR on the LCD. The LCD displays a clock
symbol.
Mode Selection
Press the Mode button to select mode.
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