User's Manual

F Series Fetal & Maternal Monitor User Manual Fetal Monitoring
- 69 -
7.7 Monitoring Fetal Movement
7.7.1 Auto Fetal Movement (AFM) Monitoring
During fetal heart monitoring with ultrasound, the fetal movement signals are also detected. The
fetal movement signals differ from the Doppler heart rate signals in that they have larger extent
and lower frequency. The larger extent is because of the bigger scope of moving areas (e.g., the
fetal arms or legs); lower frequency is because of the lower velocity of the fetal movements
compared with those of the fetal heart.
Only US1 channel can perform AFM. But be aware that when monitoring twins, the movements
detected by US1 may also be caused by the second fetus’s movement.
The movement of the fetus will be detected and displayed in the form of a trace on the screen and
the recorder paper.
AFM monitoring can be switched off; its gain is adjustable.
NOTE:
AFM monitoring is not available when FHR is monitored by DECG.
7.7.2 Enabling or Disabling AFM Trace
The AFM trace on the screen and recorder paper can be enabled or disabled.
1 Select the setup key
on the main interface.
2 Select Fetus > AFM.
3 Select ON or OFF (default).
4 Select OK.
7.7.3 Changing AFM Gain
You can change the AFM gain. The AFM gain affects overall numeric and scope of the AFM
trace.
1 Select the setup key
on the main interface.
2 Select Fetus > AFM Gain.
3 Select 1, 2, 3 (default) or 4.
4 Select OK.