Huntleigh MD200 Instrucciones De Uso página 5

OPERATING INSTRUCTIONS
OBSTETRICS
Obstetric mode is automatically selected
when an obstetric probe (OP2HS/OP3HS) is
connected. In this mode, MD200 provides
fetal heart rate (FHR) display with 3
operating modes, and outputs FHR for
printing on the Printa II.
Clinical Use
Apply a liberal amount of gel to the
abdomen. Place the faceplate of the probe
flat 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
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
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
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
MD200 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 MD200 will
automatically calculate and display the
derived FHR on the LCD. The LCD displays
a clock symbol.
OPERATING INSTRUCTIONS
OBSTETRICS
Mode Selection
Use of Manual Mode
1. Press and hold Start/Stop button
and immediately count the audible
heart beats, counting the first beat
as the button is pressed. The LCD
displays the flashing clock symbol
and the FHR reading is shown as
three dashes.
2. Release the Start/Stop button
immediately on the count of 10
(i.e. After nine beat intervals). The
MD200 will automatically calculate
the derived FHR averaged over
the 10 beat period and display the
result. This rate value is retained
until the measurement is repeated
or the unit is switched off. If the
button is held for a period less
than about 3 seconds the display
will clear the previous rate value
and reset.
Probes
OP2HS
OP3HS
5
2MHz ±1%
3MHz ±1%