SONAR User Manual

14423-INS-LAB-RevD11 22
FETALHEART(FH)MONITORING
FHMonitoringwith2.0MHzWater-ResistantProbe
Refer to picture at right. The au-
dio fetal heart beat is sent out via
the built-in speaker or attached
earphone.
1. Palpate for the fetus position
to nd the best location to
place the probe and hear the
fetal heart rate.
2. Apply a liberal amount of gel to the probe head.
3. Place the probe head on the desired location. Assure
that good coupling of the gel to the skin is achieved; the
Fetal Heart rate will not be heard if adequate gel is not
used and air is between the probe head and skin.
4. Slowly move the probe until a clear heart rate is heard.
5. Adjust the volume to the desired level.
WARNING:ItisnotpossibletomonitorFHRunless
anaudiblefetalheartsignalispresent.Thefetal
pulsecanbedistinguishedfromthematernalpulse
byfeelingthemother’spulseduringtheexamination.
WARNING:Forbestqualityaudio,placetheprobein
theoptimumposition.
WARNING:Forbestqualityaudio,avoidpositions
withstrongplacentalsounds(swishing)orfetalcord
pulse(indistinctpulseatfetalrate).
WARNING:Ifthefetusisinthecephalicpositionand
themotherissupine,theclearestheartsoundwill
normallybefoundonthemidlinebelowtheumbili-
cus.Duringmonitoring,prolongedlyinginthesupine
positionshouldbeavoided.Sittinguporlateralposi-
tionsarepreferableandmaybemorecomfortablefor
themother.