Invented in 1958 by DR.EDWARD H.HON, a fetal Doppler monitors or baby heart beat monitors is a hand-held ultrasound transducer used to detect the fetal heartbeat for prenatal care. It uses the Doppler effect to provide an audible simulation of the heart beat. Doppler fetal monitor or baby heart beat monitors is a handheld ultrasound baby heart beat monitor used to hear an embryo or fetus heart beat. Originally intended for use by health care professionals,despite this fetal Doppler devices have become extremely popular for personal use.

2. FETAL DOPPLER:
Invented in 1958 by DR.EDWARD H.HON, a fetal Doppler monitors or baby heart beat
monitors is a hand-held ultrasound transducer used to detect the fetal heartbeat for
prenatal care.
It uses the Doppler effect to provide an audible simulation of the heart beat.
Doppler fetal monitor or baby heart beat monitors is a handheld ultrasound baby heart
beat monitor used to hear an embryo or fetus heart beat.
Originally intended for use by health care professionals,despite this fetal Doppler
devices have become extremely popular for personal use.

3. TYPES:
Dopplers for home or hospital use differ in the following
ways
Manufacturer: popular manufacturers are baby
Doppler, sonoline, Newman medical Nicolet, Arjo-
Huntleigh, and summit Doppler.
Probe Type: waterproof or not. Waterproof probes are
used for water births.
Probe Frequency: 2-MHZ or 3-MHZ probes. Most
practitioners can find the probes.

4. 2 MHZ WATER PROOF PROBE:
The probe is optimized mainly for deep
penetration for heavy patients and third
trimester pregnancy.

5. 3 MHZ WATER PROOF PROBE:
The probe is good for the whole stage of
pregnancy , especially for early
pediatric/neonatal fetal heart beat detection , as
early as 8- weeks.

6. FETAL DOPPLER

7. Wave form

8. FETAL HEART RATES:
Starting at week 5 the fetal heart rate accelerates
by 3.3 bpm per day for the next month.
The fetal heart begins to beat at approximately
the same rate as the mother’s, which is typically
80 to 85 bpm.
The approximate fetal heart rate for weeks 5to 9.

9. Week 5 starts at 80 and ends at 103 bpm.
Week 6 starts at 103 and ends at 126 bpm.
Week 7 starts at 126 and ends at 149 bpm.
Week 8 starts at 149 and ends at 172 bpm.
Week 9 the fetal heartbeat tends to beat with
in a range of 155 to 195 bpm.

10. DOPPLER AUSCULTATION IN ADULTS:
It was recently demonstrated that continuous
Doppler enables the auscultation of valvular
movements and blood flow sounds that are
undetected during cardiac examination with a
stethoscope in adults.
The Doppler auscultation presented a sensitivity
of 84% for the detection of aortic regurgitations
while classic stethoscope auscultation presented
a sensitivity of 58%.

11. FETAL HEART BEAT SOUNDS:
Sounds of the fetal heart beats which like
galloping HORSE, the beat rate is about twice
as fast as the mother’s heart rate.
The frequency of sounds are between 120-
180 bpm.

12. WHAT IS A FETAL HEART MONITOR:
Just like it sounds,these at-home monitors are
used by mamas and sometimes family members
to listen to baby’s heart beat.
There are two basic kinds of at home fetal heart
rate monitors:
Dopplers,also known as doptones or Doppler
probes,and
Fetoscopes,which closely resemble stethoscopes.

13. WHAT DO FETAL HEART MONITORS
DO?
The Doppler uses high frequency sound waves and is
a handheld ultrasound device,while fetoscope work by
amplifying sound.
The ultrasound waves of a Doppler pass through your
skin and tissue into the body , where they bounce back
after encountering movement.
The Doppler then translates that movement into
amplified sound.

14. METHODS OF FETAL MONITORING:
Intermittent auscultation by Doppler
Continuous external monitoring
Continuous internal monitoring

15. ADVANTAGES OF DOPPLER:
Available
Quick and real time with immediate interpretation.
Non-invasive and safe.
Relatively of low cost.
Mobile for poly trauma and unstable patients.
High sensitivity.

16. DISADVANTAGES OF DOPPLER:
Operator dependant.
Not easy
Limitations (calcifications , air, obesity, ETC)