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Published byCalvin Gordon Modified over 8 years ago
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Prolonged pregnancy Decreased fetal movements Hypertension in pregnancy Diabetes in pregnancy Fetal growth restriction Multiple gestation PPROM Previous LSCS Obstetric cholestasis Sickle cell disease ECV Cord prolapse Spinal cord injury – Autonomic dysreflexia
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In low risk pregnancy usually induction of labour is done at 41 weks of gestation. When will you start your antepartum fetal surveillance? No need of any antenatal fetal surveillance before 41 weeks of gestation provided she is feeling the fetal movements well and clinical assessment of liquor volume is adequate.
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Suppose she declines induction of labour at 41 weeks. When will you initiate fetal surveillance? Fetal surveillance is initiated between 41 and 42 weeks because of evidence that perinatal morbidity and mortality increase as gestational age advances. How often will you do it? Twice weekly assessment of amniotic fluid and a NST should be adequate. (ACOG and RCOG – Grade C recommendation)
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What will you do when the lady complains of decreased fetal movements? After fetal viability has been confirmed and history confirms a decrease in fetal movements, arrangements should be made for the woman to have a CTG to exclude fetal compromise if the pregnancy is over 28+0 weeks of gestation.
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CTG for 20minutes The presence of a normal fetal heart rate pattern (i.e. showing accelerations of fetal heart rate coinciding with fetal movements) is indicative of a healthy fetus with a properly functioning autonomic nervous system. The fetal heart rate accelerates with 92–97% of all gross body movements felt by the mother
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If the term fetus does not experience a fetal heart rate acceleration for more than 80 minutes, fetal compromise is likely to be present 56% of women with a high-risk pregnancy who reported RFM had an abnormal CTG.This was associated with an unfavourable perinatal outcome.
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Chronic hypertension Mild or moderate gestational hypertension, Women at high risk of pre-eclampsia : Cardiotocography only if fetal activity is abnormal.
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SEVERE GESTATIONAL HYPERTENSION OR PRE- ECLAMPSIA: Cardiotocography at the time of diagnosis Repeat CTG weekly unless the results of all fetal monitoring indicate more frequent CTG ◦ the woman reports a change in fetal movement ◦ vaginal bleeding ◦ abdominal pain ◦ deterioration in maternal condition.
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When to start fetal surveillance? Initiate fetal surveillance at 38 weeks in pregnant women with diabetes provided there is no fetal growth restriction. How often to repeat? Repeat CTG weekly unless the results of all fetal monitoring indicate more frequent CTG until the time of termination of pregnancy
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CTG should not be used as the only form of surveillance in SGA fetuses. Interpretation of the CTG should be based on short term fetal heart rate variation from computerised analysis Use cCTG (computerised CTG) when DV Doppler is unavailable or results are inconsistent – recommend delivery if STV (short term variation) < 3 ms
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Ductus venosus Doppler has moderate predictive value for acidaemia and adverse outcome. Ductus venosus Doppler should be used for surveillance in the preterm SGA fetus with abnormal umbilical artery Doppler and used to time delivery.
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DICHORIONIC DIAMNIOTIC TWINS MONOCHORIONIC DIAMNIOTIC TWINS -CTG weekly from 36weeks MONOCHORIONIC MONOAMNIOTIC TWINS If concerns about significant cord entanglement consider -CTGs 3 x weekly (Monday, Wednesday and Friday) If no concerns about cord entanglement - weekly CTGs
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Women should be observed for signs of clinical chorioamnionitis. It is not necessary to carry out weekly high vaginal swab, maternal full blood count or C- reactive protein because the sensitivity of these tests in the detection of intrauterine infection is low. Cardiotogography is useful and indeed fetal tachycardia is used in the definition of clinical chorioamnionitis.
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No antepartum CTG is recommended unless fetal activity is abnormal or she experiences scar tenderness.
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Women should be informed that the case for intervention (after 37+0 weeks of gestation) may be stronger in those with more severe biochemical abnormality (transaminases and bile acids). Women should be informed of the increased risk of maternal and perinatal morbidity from intervention at 37+0 weeks of gestation. Women should be informed of the inability to predict stillbirth if the pregnancy continues. No role for CTG
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When will you initiate and how often you will do fetal surveillance? Offer fetal monitoring if the woman declines delivery by 40 weeks of gestation. Twice weekly assessment of amniotic fluid and a NST from 40 weeks of gestation.
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When will you do CTG? ECV should be performed where ultrasound to enable fetal heart rate visualisation, cardiotocography and theatre facilities are available. Cardiotocography should be performed after the procedure.
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Suspicious or pathological fetal heart rate pattern - category 1 caesarean section should be performed with the aim of achieving birth within 30 minutes or less without compromising maternal safety. Normal fetal heart rate pattern - category 2 caesarean birth can be considered with the aim of achieving birth within 75 minutes or less - but continuous assessment of the fetal heart trace is essential, if the cardiotocograph (CTG) becomes abnormal, re-categorisation to category 1 birth should immediately be considered.
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Why CTG? Electronic fetal monitoring is advised to detect fetal distress secondary to AD. Fetal bradycardia with AD in the mother When will you do CTG? Hospital care from 36+6 weeks of gestation onwards, for daily CTG and 4 hourly monitoring for uterine activity.
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