Antenatal Obstetrics 4 Flashcards
What is stillbirth? How common?
o Babies born dead after 24 weeks gestation
o 1 in 200 total births
Most common cause of stillbirth?
Idiopathic
Maternal causes of stillbirth?
Diabetes (pre-existing and gestational) Pre-eclampsia Sepsis Obstetirc cholestasis Acute fatty liver Thrombophilias (e.g. Protein C and protein S resistance, factor V leiden mutation, antithrombin II deficiency
Foetal causes of stillbirth?
Infection: Toxoplasma, Listeria, Syphilis, parvovirus Chromosomal abnormality Structural abnormality Rhesus disease leading to severe anaemia TTTS IUGR Alloimmune thombocytopaenia
Placental causes of stillbirth?
Postmaturity
Abruption
Placenta praevia: significant blled
Cord prolaspe
Other causes of stillbirth?
twins, social deprivation, increasing maternal age, smoking, previous CS, IVF, obesity
Diagnosis of stillbirth?
Absent foetal movements No foetal heart sounds Absent foetal heart beat on US (diagnostic) • Can repeat US if mother requests o Foetus looks macerated
Immediate management of stillbirth? When to advice delivery and how? Management of those not induced?
If Rh negative – give Anti-D
Kleihauer to diagnose foetomaternal haemorrhage
Ix – Temp, BP, urine, clotting screen
Advise delivery if pre-eclampsia, abruption, sepsis, coagulopathy, membrane rupture
• Induced using – mifepristone oral, prostaglandin vaginally and may need oxytocin
If not induced by 48h, check coagulopathy twice weekly
Some women choose to continue the pregnancy - >90% will spontaneously labour within 3 weeks
Management of stillbirth during labour?
Good analgesia
Wrap baby up and offer to present to mother
Photographs, lock of hair and palm print given
May need VTE prophylaxis
Practical steps following stillbirth?
Follow-up
Refer for genetic counselling if appropriate
Certificate of Stillbirth required
Bereavement counselling (SANDS)
Mother may be prescribed cabergoline to suppress lactation
Maternal tests performed to establish cause of stillbirth?
• Kleihauer, FBC, U&E, CRP, LFT, TFT, HbA1c, glucose, blood culture, viral screen (TORCH, etc), thrombophilia screen, antibodies, MSU, urine for cocaine, cervical swabs
Foetal tests performed to establish cause of stillbirth?
• Foetal and placental swabs, cord blood
• Post mortem
o If denied – MRI, cytogenetics, small volumes of tissue for metabolic studies
Define recurrent pregnancy loss? Risk factors?
• Three or more miscarriages occurring in succession before 24 weeks gestation (1% of couples).
• Risk Factors for future pregnancies
o Number of miscarriages
o Maternal age
Aetiology of recurrent misscarriages?
Antiphospholipid antibodies o Chromosomal defects (4% of couples) Uterine abnormalities are common with late miscarriage o Thrombophilia Bacterial vaginosis
What is antiphospholipid antibodies defined as?
Defined as presence of antibodies on 2 occasions plus 3 or more consecutive miscarriages <10 weeks, 1 foetal loss 10 weeks or older or 1 or more births of normal foetus >34/40 with severe pre-eclampsia or growth restriction
Common chromosomal defect causing recurrent miscarriages?
Usually balanced reciprocal or Robertsonian translocation
Common uterine defect causing recurrent miscarriages?
Cervical incompetence, polycystic ovary syndrome, adhesions etc.
Common thrombophilia causing recurrent miscarriages?
Factor V leiden, prothrombin gene and protein C and S deficiency
Investigations in recurrent miscarriages?
o Referral to specialist recurrent miscarriage clinic
o Tests for:
Antiphospholipid antibodies (positive if 2 tests +ve, 12 weeks apart)
Thrombophilia screening
Pelvic US to assess uterus
Karyotype foetal products
• If abnormal chromosome – karyotype parental blood
High cervical swab for bacterial vaginosis
Treatments in recurrent miscarriage - antiphospholipid syndrome?
Aspirin 75mg PO from day of positive pregnancy test
Enoxaparin 40mg SC as soon as foetal heart seen
Treatments in recurrent miscarriage - thrombophilia?
LMWH (Enoxaparin)
Treatments in recurrent miscarriage - bacterial vaginosis?
Treat infection
Definition of miscarriage?
- Loss of a pregnancy before 24 weeks gestation
Define early miscarriage?
- Early miscarriage, if it occurs before 13 weeks of gestation
Define late miscarriage?
- Late miscarriage, if it occurs between 13 and 24 weeks of gestation
How common are miscarriages?
- 15-20% of pregnancies miscarry, mostly in 1st trimester
- Rate increases with maternal age
Definition of threatened miscarriage?
o There is bleeding but the foetus still alive, the uterus is the size expected from the dates and the OS is closed.
o Only 25% will go on to miscarry
Definition of inevitable miscarriage?
o Bleeding is usually heavier.
o Although the fetus may still be alive, the cervical OS is open.
o Miscarriage is about to occur
Definition of incomplete miscarriage?
Some fetal parts have been passed, but the os is usually open.
Definition of complete miscarriage?
o All fetal tissue has been passed.
o Bleeding has diminished, the uterus is no longer enlarged and the cervical os is closed.
Definition of septic miscarriage?
o The contents of the uterus are infected causing endometritis.
o Vaginal loss is offensive and the uterus is tender.
o A fever can be absent.
o If pelvic infection occurs there is abdominal pain and peritonism
Definition of missed miscarriage?
o The fetus has not developed or died in utero, but this is not recognised until bleeding occurs or USS is performed
o The uterus is smaller than expected for dates and the OS is closed
Aetiology of isolated miscarriages?
- Isolated non-recurring chromosomal abnormalities – 60% of one off miscarriages
- Exercise, intercourse and emotional trauma DO NOT cause miscarriage
Symptoms and signs of miscarriage?
- Bleeding PV in first 24 weeks
- Pain
- Enquire about: nausea, vomiting, dizziness, fainting, shoulder tip pain, urinary symptoms, passage of tissue
- Need to assess state of os and uterine size
Investigations in miscarriage?
- Urine pregnancy test
- Blood hCG
- USS
- Bloods: FBC, Rh group, antiphospholipid antibodies, thrombophilia screening
- Blood culture
Initial management of early pregnancy bleeding? What about is haemodynamically unstable?
o If >6 weeks and no pain, tenderness, cerical motion tenderness – refer for EPAU services
o If <6 weeks and no pain – repeat pregnancy test in 7 days, if positive then refer to EPAU
o If unacceptable pain or bleeding – surgical management of miscarriage
Evacuation of retained products of conception (ERPC)
o Immediate admission if haemodynamically unstable
IV fluids
If bleeding profuse – ergometrine 0.5mg IM
If there is a fever, swabs for bacterial culture are taken and IV abx are given
Management of uncertain viability of miscarriage?
o Arrange rescan in 10-14 days
Counselling in patient suffering a miscarriage?
o Patients should be told that the miscarriage was not the result of anything they did/didn’t do.
o There is a likelihood of bleeding, but foetal tissue usually absorbed
o Reassurance of the high chance of successful further pregnancies is important.
o Referral to support group may be useful.
o Miscarriage is common → further investigation is reserved for women who have had three miscarriages