Fetal Assessment Presented by: Ann Hearn, MSN, RNC 2013.
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Transcript of Fetal Assessment Presented by: Ann Hearn, MSN, RNC 2013.
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Fetal Assessment
Presented by:Ann Hearn, MSN, RNC
2013
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Ultrasound
Definition -- an instrument which uses high frequency sound waves that deflect off of tissue and return as echoes to visualize structures in the body
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Ultrasound
Advantages: Results are immediate Requires about 20 - 30 minutes Allows the mother and family to “see”
the baby NOW IN 3DDisadvantages: Expensive No Dx of inborn errors of metabolism
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Ultrasound First Trimester (1-12 wks)Transvaginal US –procedureEmpty bladderLithotomy positionAssessment:Confirms pregnancy , viability & locationEstimates gestational ageIdentify fetal abnormalitiesAdjunct to chorionic villus sampling
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Ultrasound 2nd & 3rd Trimester (13-40wks)Transabdominal USLeft tilt position with knees sl. BentFull bladder (2nd trimester)Assessment:Confirm viability, estimate gestational ageEvaluate anatomy and placental locationAssess growthEvaluate amniotic fluid volumeGuide for amniocentesis
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Alpha - Fetoprotein (AFP) Measurement of protein produced by the
yolk sac and liver found in fetal plasma.
– Elevated AFP may indicate: Open neural tube defects Anterior abdominal wall defects Multiple gestation Advanced gestational age
– Low AFP associated with: Down syndrome (trisomy 21) Edwards syndrome (trisomy 18)
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Chorionic Villus Sampling
(CVS) Invasive procedure Removal of small tissue specimen
from the fetal portion of the placenta Tissue obtained about 10 - 13
weeks gestation Detects chromosomal, metabolic &
DNA abnormalities
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Trans-cervical Chorionic Villus Sampling
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Chorionic Villus SamplingCVS
Risks:– Failure to obtain tissue– Rupture of amniotic membranes– Leakage of amniotic fluid– Vaginal bleeding – Intraurterine infection– Rh Alloimmunization– Maternal tissue contamination of the
specimen– Increased risk of spontaneous abortion
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Chorionic Villus SamplingCVS
Nursing interventions– Monitor :
vital signs FHR uterine contractions/cramping vaginal discharge
– Administer Rhogam if indicated– Teach patient to report:
Uterine contractions Vaginal discharge S/S of infection
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Amniocentesis
Aspiration of amniotic fluid by insertion of a needle through the abdominal and uterine wall into the amniotic sac
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Amniocentesis
Purposes:2nd trimester
– Chromosomal abnormalities– Fetal Rh sensitization– Dx amnionitis– Confirm abnormal AFP (AFAFP)
3rd trimester– Fetal lung maturity
L/S ratio– Fetal hemolytic disease
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Amniocentesis
An invasive procedure Requires a consent form to be signed Performed: 2nd trimester (between
15 20 wks gestation ) & during 3rd trimester.
Complications– Trauma– Infection – Hemorrhage– Preterm labor
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Amniocentesis
Preparation– Vital Signs and FHT’s– Empty bladder– Abdominal prep and scrub– Ultrasound– Left tilt position
Area of insertion is anesthesized and a needle inserted into the amniotic cavity
15 - 20 cc of fluid withdrawn for analysis
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Amniocentesis
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Amniocentesis
Post care / Discharge Teaching– Monitor V/S, FHT’s and UC’s X 1 hour– Administer Rhogam if Rh negative– Observe for leakage of fluid from site– Teach patient to report –
Fetal hyperactivity or lack of fetal movement
Vaginal discharge: clear or bleeding Uterine contractions or abdominal pain Fever or chills
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L/S Ratio Lecithin /Sphingomyelin
Ratio
Lecithin and Sphingomyelin are two components of Surfactant.
Assesses Fetal Lung Maturity
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L/S Ratio Lecithin /Sphingomyelin Ratio
As surfactant increases in the fetal lungs, the levels of lecithin should also increase.
Lecithin becomes 2 - 3 times > sphingomyelin by about 35 weeks
Fetal maturity & adequate surfactant = L/S ratio > 2 : 1
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Karyotyping
Determine sex of the fetus
Normalcy ofChromosomes
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Karyotyping
Indications:– Maternal age 35 or > at time of birth (AMA)– Pervious child born with a chromosomal
abnormality– Mother carrying an X-linked disease– Parents carrying an inborn error of
metabolism– Both parents carrying an autosomal
recessive disease– Family history of neural tube defects
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Karyotyping
Trisomy Monosomy
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Antepartum Testing
Purpose– Determine fetal health or
compromise– Guide interventions– Reduce perinatal
morbidity/mortality
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Non-Stress Test - NST
Assessment of fetal status Observation of fetal heart rate
associated with fetal movement. The FHR should increase or
accelerate with fetal movement FHR accelerations indicate an
intact CNS and adequate oxygenation
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Procedure for an NST
Electronic fetal monitor is applied Fetal movements are documented Compare the FHR with the fetal
movements Results:
– Reactive -- at least two accelerations of FHR with fetal movement of 15 BPM, lasting 15 seconds or more, over 20 minutes.
– Nonreactive -- the reactive criteria are not met. Indication of need for further assessment
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Non-Stress Test - Reactive
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Contraction Stress Test – CST
A means of identifying the fetus that is at risk for intrauterine asphyxia. Determines utero-placental insufficiency.
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Procedure for an CST Electronic fetal monitor attached IV Oxytocin (low dose) –or- Nipple stimulation started Goal -- 3 contractions of good
quality, lasting 40-60 seconds over a 10 minute period
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Contraction Stress Test - CST Results:
– Negative -- 3 contractions in 10 minutes with NO signs of late decelerations
– Positive -- repetitive persistent late decelerations occurring with more than half the contractions
– Equivocal – FHR decelerations with uterine hyperstimulation
– Unsatisfactory – fewer than 3 contractions in 10 minutes
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Positive CST
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Contraction Stress Test
Post CST Monitoring– FHR– Labor– SROM
Discharge instructions– Notify HCP for the following:
Regular painful contractions Leakage of amniotic fluid Decrease or increase in fetal movement Vaginal bleeding
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Fetal Assessment
Non-Stress Test Reactive
Non - ReactiveRepeat in 1 - 2 weeks Reactive Stimulate
Non- Reactive
Contraction Stress Test
Negative Positive
Further Evaluation
Repeat NST in 1 week Possible Delivery
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Try This!
Which of the following is NOT an indication of fetal distress?A. A reactive non-stress testB. Non-reactive non-stress testC. A positive CSTD. A negative CST
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Biophysical Profile
Comprehensive assessment of five biophysical variables:
1. Fetal breathing movement2. Fetal movements of body or limbs3. Fetal tone (extension and flexion of
extremities)4. Amniotic fluid volume – visualized as
pockets around the fetus5. Reactive FHR with activitity (reactive NST)
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Biophysical Profile
By combining these five assessments, the BPP helps to
identify the compromised fetus and to confirm the
healthy fetus
Since it combines several assessments, it is a better
indicator of fetal well-being
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Biophysical Profile
A score of 0 or 2 is assigned to each finding for a maximum score of 10.
Scores of 8-10 are considered normal
Lower scores are associated with a compromised fetus and warrant further assessment and possible delivery of the fetus.
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BiophysicalVariable
Normal(Score = 2)
Abnormal(Score = 0)
Fetal breathing movements
1 or more episodes of >20 s within 30 min
Absent or no episode of >20 s within 30 min
Gross body movements
2 or more discrete body/ limb movements within 30 min (episodes of active continuous movement considered as a single movement)
<2 episodes of body/limb movements within 30 min
Fetal tone 1 or more episodes of active extension with return to flexion of fetal limb(s) or trunk (opening and closing of hand considered normal tone)
Slow extension with return to partial flexion, movement of limb in full extension, absent fetal movement, or partially open fetal hand
Reactive FHR
2 or more episodes of acceleration of >15 bmp* and of >15 s associated with fetal movement within 20 min
1 or more episodes of acceleration of fetal heart rate or acceleration of <15 bmp within 20 min
Qualitative AFV
1 or more pockets of fluid measuring >2 cm in vertical axis
Either no pockets or largest pocket <2 cm in vertical axis
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Fetal Movement: Kick Counts
Non-invasive Goal:
– 10 kicks in 12 hours – 2-3 times/day – at least 3 movements
in 60 minutes
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