2. DefinitionDefinition
Antenatal fetal surveillance is assessmentAntenatal fetal surveillance is assessment
of fetal wellbeing in antepartum period toof fetal wellbeing in antepartum period to
ensure delivery of healthy neonate.ensure delivery of healthy neonate.
5. Aims of Fetal MonitoringAims of Fetal Monitoring
Assuming satisfactory growth & wellbeing ofAssuming satisfactory growth & wellbeing of
fetus & mother throughout pregnancyfetus & mother throughout pregnancy
Screening high risk cases & adverse maternalScreening high risk cases & adverse maternal
and/or intrauterine factors which affect the fetusand/or intrauterine factors which affect the fetus
Detecting early congenital anomalies and inbornDetecting early congenital anomalies and inborn
metabolic disorders to decide early terminationmetabolic disorders to decide early termination
6. Objectives of Fetal SurveillanceObjectives of Fetal Surveillance
To determine gestational ageTo determine gestational age
To discover fetal congenital anomaliesTo discover fetal congenital anomalies
To detect abnormalities of fetal growthTo detect abnormalities of fetal growth
To detect & determine the severity of acute &To detect & determine the severity of acute &
chronic fetal hypoxiachronic fetal hypoxia
7. Initiation of antepartum fetalInitiation of antepartum fetal
surveillancesurveillance
EARLY PREGNANCYEARLY PREGNANCY
LATE PREGNANCYLATE PREGNANCY
11. BiochemicalBiochemical
A. Material serum alpha foeto protein
It is the onco protein
It is produced by yolk sac & foetal liver.
The highest level of the AFP in foetal serum &
amniotic fluid .
Material serum level peak around 32 weeks .
MSAP screening can be done between 15 - 21
weeks gestation (17 weeks is ideal)
12. MSAFP elevated at
Wrong gestational age
Open neural tube defect of the foetus
Multiple pregnancy
IUF
Anterior abdominal wall defects
Renal anomalies
MSAFP is low at
Trisomies (Down syndrome)
Gestational trophoblastic diseases
neural tube defect
13. B. Triple test
It is combined biochemical test which includes
MSFP, HCG & UE3 (unconjugated oestriol) .
It is used for detection of down syndrome .
In an affected pregnancy level of MSAFP & UE3
tend to be low while that the HCG is high .
It is performed at 15-18 weeks .
14. C. Coomb’s test
Coomb’s test is used for Rh incompatibility.
if the coomb’ test is greater than 1:8 to 1:16 thann,
amniocentesis is done for diagnosis of need for
intrauterine transfusion.
It is used to detect presence or absence of the
material antibodies on fetal red cells .
if there are no antibodies , the blood is retested at
28 & 34 weeks of pregnancy.
15. D. Acetyl choline esterase(AchE)
It is elevated in most cases of open neural tube
defects , it has got better diagnostic value than
AFP.
E. Inhibin A
It is dimetric glycoprotein . it is produced by the
corus luteum & the placenta
.
serum level of the inhibin A is raised in the women
carrying a foetus with down syndrome
16.
17. A. Florescence in Situ Hybridization(FISH)
FISH, or Fluorescence In Situ Hybridization, is a diagnostic
prenatal test which looks for a few common chromosomal
abnormalities mainly limited to Trisomy 13 (Patau syndrome),
Trisomy 18 (Edward’s syndrome) and Trisomy 21 (Down
syndrome) .
FISH does not have false positive results. If the fetal cells
contain certain chromosomal abnormalities, this will be apparent
with the FISH test.
The only exception might be if the parent has a chromosomal
abnormality and the fetal cells were contaminated with parental
cells.
18.
B. DNA amplification using the polymerace chain
reaction[PCR]
It provides the convenient & efficient means of
making millions of copies of a sort DNA sequence
heating cooling cycles are used to denature to DNA
& then build new widely used for assessing genetic
variation , for diagnosing genetic disease & for
forensic purpose.
It can be made directly from fetus by
amniocentesis
chorionic villi sampling
chrordiocentesis.
20. Indications
Genetic testing- Genetic amniocentesis done to
detect certain conditions, such as Down syndrome.
Fetal lung testing- To determine whether the
baby's lungs are mature enough for birth.
Diagnosis of fetal infection- To evaluate a baby
for infection or other illness. The procedure also can
be done to evaluate the severity of anemia in babies
who have Rh sensitization — an uncommon
condition in which a mother's immune system
produces antibodies against a specific protein on the
surface of the baby's blood cells.
26. Chorionic villus sampling does not detect:
Neural tube defects
Rh incompatibility
Complications:
foetal loss (1-2%) , oromandibular limb deformities ,
vaginal bleeding, limb reduction defects are high
when CVS are less then 10 week of the gestation
CVS when performed between 10-12 weeks are
safe and accurate as that of the of the aminocentesis
28. Fetal Blood Sampling
Cordocentsis ( percutaneous umbilical blood
sampling )
Direct access to the fetal circulation during the
second and third trimesters is now possible through
PUBS . It is the most widely used method for fetal
blood sampling and transfusion
PUBS is now the route of choice for intrauterine
transfusion for severely anemic fetuses; it can start as
early as 19 weeks
38. CLINICAL
The clinical assessment to done to assess the foetal
growth.
It can be done by following methods:-
Maternal weight gain
Blood pressure
Assessment of size of uterus & height of fundus
Clinical assessment of liquor
Edema of feet
Abdominal girth in last trimester
39. 1.Maternal weight gain:1.Maternal weight gain:
In second half of pregnancy: average weight
gain is 1 kg/fortnight.
Excess weight gain: Could be 1st
sign of pre-
eclampsia.
If weight gain less than normal, stationary or
falling: Look for IUGR
40. 2. Blood pressure:
Initial recording of BP prior to 12 weeks helps to
differentiate pre-existing chronic hypertension from
pregnancy induced hypertension.
Hypertension, pre-existing or pregnancy induced
may impair fetal growthh.
41. 3. Assessment of size of uterus & height of
fundus:
Top of fundus is measured from superior border of
symphysis pubis (bladder should be empty) using a
tape.
After 24 weeks of pregnancy, distance measured in
cm normally corresponds to period of gestation in
weeks
42. 4.Clininical4.Clininical assessment ofassessment of
liquorliquor
The normal range of aminioticThe normal range of aminiotic
fluid volume (AFI) is wide butfluid volume (AFI) is wide but
the approximate volumes are:the approximate volumes are:
- 500 ml at 18 weeks- 500 ml at 18 weeks
- 800 ml at 34 weeks.- 800 ml at 34 weeks.
- 600 ml at term.- 600 ml at term.
Clinical assessment is unreliable.Clinical assessment is unreliable.
Objective assessment depends on USGObjective assessment depends on USG
to measure:to measure:
- deepest vertical pool (DVP).- deepest vertical pool (DVP).
- Amniotic fluid- Amniotic fluid index (AFI).index (AFI).
44. BIOCHEMICAL
These test are mainly done for assessment of
pulmonary maturity.
1. Shake test or Bubble test (Clement’s):
Based on ability of pulmonary surfactant to form a
foam or bubble on shaking which remains stable for
at least 15 minutes.
Increasing dilutions of amniotic fluid are mixed with
96 % ethanol, shaken for 15 seconds and inspected
after 15 minutes for the presence of a complete ring
of bubbles at the meniscus. Indicates maturity of the
fetal lungs.
45. 2. Foam Stability Index (FSI) :
Based on surfactant detection by shake test.
Serial dilutions of amniotic fluid to quantitate amount of
surfactant present.
FSI >47 virtually excludes risk of RDS.
OTHER TEST
3. Presence of phosphatidyl glycerol[PG]
4. Saturated phosophatidly choline
5. Amniotic fluid optical density
6. Florescence polarization
47. BIOPHYSICAL
It is the screening test for the utero-placental insufficiency .
The fetal biophysical activities is initiated , modulated &
regulated by the fetal nervous system .
The fetal CNS is very much sensitive to diminished
oxygenation.
48. Fetal Movement CountFetal Movement Count
1. Fetal movement monitoring1. Fetal movement monitoring
Cardif ‘count 10’ formulaCardif ‘count 10’ formula::
Mother counts fetal movements starting at 9 am.Mother counts fetal movements starting at 9 am.
Counting ends when 10 movements are perceived.Counting ends when 10 movements are perceived.
Report to physician if:Report to physician if:
– (i) less than 10 movements occur during 12 hours on(i) less than 10 movements occur during 12 hours on
2 successive days or2 successive days or
– (ii) no movement is perceived even after 12 hours in a(ii) no movement is perceived even after 12 hours in a
single day.single day.
49. Daily fetal movement count (DFMC):Daily fetal movement count (DFMC):
One hour duration each in morning, noon andOne hour duration each in morning, noon and
evening. (Total 1+1+1 = 3 hours)evening. (Total 1+1+1 = 3 hours)
Total counts multiplied by four gives daily (12 hour)Total counts multiplied by four gives daily (12 hour)
fetal movement count (DFMC).fetal movement count (DFMC).
If there is diminution of number of ‘kicks’ to less thanIf there is diminution of number of ‘kicks’ to less than
10 in 12 hours (or less than 3 in each hour), it10 in 12 hours (or less than 3 in each hour), it
indicates fetal compromise.indicates fetal compromise.
50. Nonstress Testing(NST)
A test monitors the fetal heart rate in response to fetal
movements in order to assess the integrity of fetal central
nervous system & cardio vascular system.
The non – stress test(NST) involves application of the fetal
monitor to record the fetal heart rate.
The mother is instructed to push a marker button when she
feels the fetus move. The marker button when she feels the
fetus move.
The marker button indicates movement as it occurred in
relationship to the fetal heart rate.
With sufficient placental functioning ,the fetus should
demonstrate an acceleration in heart rate with movement, in
the same way that the adult experiences increased heart rate
with exercises.
51. Purpose
To assess the fetal ability to cope with
continuation of a high risk pregnancy.
To determine the project ability of a fetus to
withstand the stress of labour.
To assess the fetal status in women for whom
contraction stress test is contraindicated such
as previous caesarean section,or preterm
labour.
52. IndicationsIndications
Indications(Maternal)
Post dated Pregnancy
Rh Senstization
Material age 35 or more
Chronic renal disease
Hypertension
Collagen disease
Sickle cell disease
Diabetes
Premature rupture of
membrances
History of still birth
Trauma
Indications (Fetal)
Decreased fetal
movements
Intrauterine growth
retardation(IUGR)
Fetal evaluation after
amniocentesis
Oligohydramnios/polyhyd
ramnios
53. Result
Reactive non stress test(normal/negative)
Reactive indiacates a healthy fetus .
The result requires two or more FHR accelerations of at
least 15 beats per minutes , lasting at least 15 sec from the
beginning of the acceleration to the end , in association to
the end , in association with fetal movement during a 20 –
minute period.
Nonreactive nonstress test(abnormal)
No acceleration or accelerations of less than 15 beats per
min or lasting less than 15 sec in duration occur be
interpretated because of the poor quality of the FHR tracing.
54. 3. Contraction stress Tests
A contraction stress test is a test performed during
pregnancy to verify whether or not the unborn baby’s heart is
strong enough to withstand labour.
It uses drugs or nipple stimulation to make the uterus
temporarily contract in order to replicate labor contractions .
The test is typically only used if the unborn baby has has
abnormal results during other pregnancy health examinations
A contraction stress test(CST) can reveal whether your baby
has an abnormal heart rate during contractions- a distinct
pattern of slowing heartbeats during & immediately following a
contraction-that may indicate distress .
55. CSTCST
Oxytocin drip started at 0.5 mU/min, double inOxytocin drip started at 0.5 mU/min, double in
every 15-20 min interval till 3 contractions lastingevery 15-20 min interval till 3 contractions lasting
for 40-60 sec occur in 10 minfor 40-60 sec occur in 10 min
Time taken 1½ - 2 hrsTime taken 1½ - 2 hrs
No hypoxiaNo hypoxia →→ FHR pattern uncharged duringFHR pattern uncharged during
contractioncontraction
HypoxiaHypoxia →→ FHR slows down with decelerationFHR slows down with deceleration
– Late deceleration is significantLate deceleration is significant
56. Indications
IUGR
Postmaturity
Hypertensive disorders of pregnancy
Diabetes mellitus
Women with nonreactive NST
Contraindications
Third trimester bleeding
Incompetent cervix
Multiple gestation
Previous classical uterine incision
History of preterm labour
Premature rupture of membranes.
57. Result:
Negative contraction stress test (normal):
A negative result is represented by late or variabal
decelerations of the fetal rate.
Positive result : is represented by late or variable
declarations of the fetal heart with 50 % or more of the
contractions in the absence of hyperstimulation of the
uterus.
Equivocal: An equivocal result contain decelerations but
with less than 50% of the contractions ,or the uterine
activity shows the hyperstimulation of the uterus.
Unsatisfactory: An unsatisfactory result means that
adequate uterine contractions cannot be achieved or the
fetal heart rate tracing is not of sufficient quality for
adequate intervention
58. 5. FETAL CARDIOCOGRAPHY
It is a technical means of recording the fetal heartbeat & the uterine
contractions during pregnancy,typically in the third trimester .
The machine used to perform the monitoring is called a cardiotocography,
more commonly known as an electronic fetal monitor(EFM)
External measurement - means taping or strapping the two sensors to the
abdomen measures the tension of the maternal abdominal wall – an indirect
measure of the intrauterine pressure.
Internal measurement- requires a certain degree of cervical dilatation , as
it involves inserting a pressure catheter into the ulterine cavity , as well as
attaching a scalp electrode to the fetal head to adequately measure the
electric activity of the fetal heart to adequately measure the electric activity
of the fetal heart
59. Effect on management :
The use of cardiotography reduces the rate of
seizures in the newborn , but there is no clear
benefit in the prevention of cerebral palsy , perinatal
death and other complication of labour .
In contrast labour monitored by CTG is slightly more
likely to result in instrumenet delivery ( forceps or
vacuum extraction ) or caesarean section
60. 5.The biophysical profile ( BPP ) :
Has 5 components
1. Fetal movement
2 .Fetal tone
3 .Fetal breathing
4 .Amniotic fluid volume
5 .Fetal heart rate
61. VariableVariable Score – 2Score – 2 Score – 0Score – 0
Fetal reactivityFetal reactivity
> 2 FHR> 2 FHR
accelerationacceleration
No or < 2No or < 2
accelerationacceleration
Fetal breathingFetal breathing
movementmovement
At least 1 of > 30At least 1 of > 30
secsec
No FBM or < 30 secNo FBM or < 30 sec
Fetal movementFetal movement
(Gross body(Gross body
movement)movement)
> 3 discrete GBM> 3 discrete GBM < 2 or nil< 2 or nil
Fetal toneFetal tone
At least one episodeAt least one episode
of limb flexion toof limb flexion to
rapid extensionrapid extension
No limb movement orNo limb movement or
slow flexionslow flexion
Amniotic fluid volAmniotic fluid vol
> 1 pocket of > 1 cm> 1 pocket of > 1 cm
depth in twodepth in two
perpendicular planeperpendicular plane
Largest pocket < 1Largest pocket < 1
cm in twocm in two
perpendicular planesperpendicular planes
62. InterpretationInterpretation
Score – 10Score – 10 →→
– Conservative managementConservative management
– Repeat after 1 wk or after 3 days in IUGR, diabetes,Repeat after 1 wk or after 3 days in IUGR, diabetes,
postmaturitypostmaturity
Score – 8Score – 8 →→
– Liqour normal, manage as beforeLiqour normal, manage as before
– If less or postmaturityIf less or postmaturity →→ DeliverDeliver
Score – 6Score – 6 →→ EquivocalEquivocal
– Repeat test after 24 hrsRepeat test after 24 hrs
– If sameIf same →→ DeliverDeliver
Score – 4 or lessScore – 4 or less →→ AbnormalAbnormal
– Immediate delivery except when fetus is grossly immatureImmediate delivery except when fetus is grossly immature
Modified BPSModified BPS →→ Placental grading considerPlacental grading consider
– If premature agingIf premature aging →→ Fetal compromiseFetal compromise
63. 6.Fetal Monitering by Fetal Scalp Blood
Sampling
Fetal Scalp blood sampling is done when CTG shows
persistant abnormal trace.
It is used in the high risk cases of delivery.
Significance of fetal scalp blood PH
Normal 7.25-7.35
Border line 7.25-7.30
Abnormal below 7.20 delivery is done for fetal
asphyxia.
64. Doppler UltrasonographyDoppler Ultrasonography
UterineUterine
UmbilicalUmbilical
Internal carotid arteryInternal carotid artery
Cerebral vesselsCerebral vessels
Peak systolic & end diastolic blood flowPeak systolic & end diastolic blood flow
measuredmeasured
Systolic: Diastolic < 3 is normal in umbilical &Systolic: Diastolic < 3 is normal in umbilical &
uterine arteryuterine artery
Lack of diastolic component or reversal diastolicLack of diastolic component or reversal diastolic
blood flow is ominous sign.blood flow is ominous sign.
65. 7. Amniocentesis in Late Pregnancy7. Amniocentesis in Late Pregnancy
Pulmonary maturityPulmonary maturity
Assessment of severity of Rh-isoimmunisationAssessment of severity of Rh-isoimmunisation
Maturity of fetus by Nile blue testMaturity of fetus by Nile blue test
Orange cells > 50% mature fetusOrange cells > 50% mature fetus
66. 8.Other test8.Other test
Assessment of severity of Rh-
isoimmunisation:
It is done by amniocentesis for
estimation of bilirubin in the amniotic fluid
by spectophometric analysis.
Assesment of aminotic fluid leakage:
It can be done by fern test,nitrazine test,apt
test.