Huntleigh DOPPLEX MD2 Manual Del Usuario página 5

O O P P E E R R A A T T I I N N G G I I N N S S T T R R U U C C T T I I O O N N S S
O O B B S S T T E E T T R R I I C C S S
Obstetric mode is automatically selected
when an obstetric probe (OP2HS/OP3HS) is
connected. In this mode, M M D D 2 2 provides fetal
heart rate (FHR) display with 3 operating
modes, and outputs FHR for printing on the
Printa II. The S S D D 2 2 in obstetric mode provides
audio only.
C C l l i i n n i i c c a a l l U U s s e e
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.
S S t t a a n n d d a a r r d d M M o o d d e e - M M D D 2 2 O O n n l l y y
In this mode the FHR, averaged over 4-heart
beats, is displayed on the 3-digit readout.
The LCD displays an outline heart symbol.
S S m m o o o o t t h h e e d d M M o o d d e e - M M D D 2 2 O O n n l l y y
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.
M M a a n n u u a a l l M M o o d d e e - M M D D 2 2 O O n n l l y y
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
M M D D 2 2 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 M M D D 2 2 will
automatically calculate and display the
derived FHR on the LCD. The LCD displays
a clock symbol.
O O P P E E R R A A T T I I N N G G I I N N S S T T R R U U C C T T I I O O N N S S
O O B B S S T T E E T T R R I I C C S S
M M o o d d e e S S e e l l e e c c t t i i o o n n
U U s s e e o o f f M M a a n n u u a a l l M M o o d d e e
1. Press and hold S S t t a a r r t t / / S S t t o o p p 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
M M D D 2 2 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.
P P r r o o b b e e s s
OP2HS 2MHz ±1%
OP3HS 3MHz ±1%
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