WOMEN'S HEALTH - OBSTETRICS Flashcards
ECTOPIC PREGNANCY
What is an ectopic pregnancy?
- When a fertilised ovum implants outside of the uterine cavity, 98% tubal
ECTOPIC PREGNANCY
Where is the most common site for an ectopic?
What is the most common site for a ruptured ectopic?
- Ampulla
- Isthmus
ECTOPIC PREGNANCY
What is the epidemiology of ectopics?
What are some risk factors for ectopics?
- 1 in 100 incidence
- Previous ectopic (10% recurrence rate), PID, endometriosis, tubal surgery, IUCD, IVF + POP
ECTOPIC PREGNANCY
What are some symptoms of ectopics?
- Amenorrhoea for 6-8w, PV bleeding (small amount, brown)
- Constant lower abdo (iliac fossa) pain
- D+V, dizziness + fainting
ECTOPIC PREGNANCY
What are some signs of ectopics?
- Referred shoulder pain due to haemoperitoneum irritating diaphragm
- Abdo or rebound tenderness
- Cervical excitation/motion tenderness
- Peritonism or collapse if rupture
ECTOPIC PREGNANCY
What are some crucial investigations for ectopics?
- Beta-hCG to confirm pregnant – should double every 48h in normal
- TVS = empty uterus, may show adnexal mass or free fluid
ECTOPIC PREGNANCY
What are some other investigations for ectopics?
- FBC, group + save, serum progesterone <20nmol/L suggests failing pregnancy
- Laparoscopy gold standard but only used as necessary
ECTOPIC PREGNANCY
What are the 3 management techniques for ectopic pregnancies?
- Expectant
- Medical
- Surgical
ECTOPIC PREGNANCY
What is expectant management?
What are the indications?
What indicates that it has worked?
- Effectively do nothing
- Clinically stable (no Sx), ectopic <35mm, no heartbeat, serum hCG <1000IU/L (consider up to 1500) + able to return for follow up
- Serum hCG days 2, 4 + 7 (drop ≥15% then repeat weekly until negative)
ECTOPIC PREGNANCY
What is medical management?
What are the indications?
What indicates that it has worked?
- Single dose IM 50mg/m^2 methotrexate
- No significant pain, unruptured ectopic <35mm, no heartbeat, serum hCG <1500 (consider up to 5000IU/L) + able to return for follow up
- hCG levels at days 4 + 7 then weekly, <15% fall = ?another dose
ECTOPIC PREGNANCY
What are the requirements for methotrexate management?
What are some side effects?
- Satisfactory liver + renal functions
- Teratogenic so effective contraception for 3m
- Conjunctivitis, diarrhoea, abdo pain + stomatitis
ECTOPIC PREGNANCY
What surgical management is offered?
What are indications?
What else should be given?
- Salpingectomy or salpingotomy
- Does not meet expectant or medical criteria (>35mm, visible heartbeat, ruptured)
- Anti-D for rhesus -ve in surgical management
ECTOPIC PREGNANCY
How do you choose which type of surgical management to give?
- Salpingectomy if contralateral tube + ovary healthy to reduce recurrence
- Salpingotomy if contralateral tube defected
- Laparoscopy preferred to laparotomy unless haemodynamically unstable
MISCARRIAGE
What is a miscarriage?
- Spontaneous termination of a pregnancy before 24w gestation
MISCARRIAGE
What is the epidemiology of miscarriage?
- 15–20% of pregnancies with 85% in first trimester
- No increased risk of having another miscarriage after 1 but is after 2
MISCARRIAGE
What are the 6 types of miscarriage?
- Threatened
- Inevitable
- Incomplete
- Complete
- Missed
- Septic
MISCARRIAGE
What are the most common causes of miscarriage in first trimester?
Chromosome abnormality –
- Autosomal trisomy most common (trisomy 16)
- Most common single chromosomal anomaly is 45X
- Increasing maternal age biggest risk
MISCARRIAGE
What is the most common cause of miscarriage in the second trimester?
- Incompetent cervix
MISCARRIAGE
What are some other causes of miscarriage?
- PCOS
- TORCH infections
- Iatrogenic (amniocentesis, CVS)
- Smoking, substance abuse
MISCARRIAGE
What are some risk factors for miscarriage in the second trimester?
Previous cervical surgery, BV in 2nd trimester
MISCARRIAGE
What is a threatened miscarriage?
- Foetus alive but miscarriage may occur (majority don’t)
- Painless vaginal bleeding with closed cervical os
- TVS = viable intrauterine pregnancy
MISCARRIAGE
What is an inevitable miscarriage?
- Miscarriage will occur
- Heavy PV bleed with clots + crampy abdo pain with open cervical os (1 finger)
- POC not passed
- TVS = intrauterine gestation sac, foetus may be alive but miscarriage imminent
MISCARRIAGE
What is an incomplete miscarriage?
- Not all POC been passed
- PV bleed, abdo pain + open cervical os with POC in canal
- Medical or surgical mx as infection risk
MISCARRIAGE
What is a complete miscarriage?
- Full miscarriage occurred with all foetal tissue passing
- Bleeding + pain cease, uterus no longer enlarged, cervical os closed
- TVS = empty uterus, endometrial thickening <15mm, exclude ectopic
MISCARRIAGE
What is a missed miscarriage?
- Foetus not developed or died in utero but this is not recognised until bleeding occurs or TVS
- TVS - non-viable intrauterine pregnancy (smaller than expected) e.g. 12w scan shows 9w foetus with no heartbeat
MISCARRIAGE
What is a blighted ovum?
- In missed miscarriage, a gestational sac >25mm but no embryonic/foetal pole
MISCARRIAGE
What is a septic miscarriage?
- Contents of uterus infected causing endometritis
MISCARRIAGE
What is a pregnancy of uncertain viability?
Small sac with no visible heartbeat,
rescan 10–14d
PREGNANCY OF UNKNOWN LOCATION
What is a pregnancy of unknown location?
No sign of intrauterine, ectopic or retained POC but positive beta-hCG
PREGNANCY OF UNKNOWN LOCATION
What is the management of pregnancy of unknown location?
- Beta-hCG >1500IU/L ?ectopic
- Significant distress = laparoscopy
- Stable = repeat beta-hCG after 48h
- If no Dx after 3 samples = expectant or methotrexate Mx
MISCARRIAGE
What are the generalised investigations and management of miscarriage?
- Refer to EPAU for Ix
- Speculum exam = cervical os open/closed, remove POC if in cervical os
- Serum beta-hCG levels
- TVS = location + viability
- Histological exam of any tissue passed vaginally
MISCARRIAGE
What would serum beta-hCG levels show in miscarriage?
- Serial testing as should double every 48h for first few weeks of pregnancy
- Levels may be less than expected for dates
- Falling indicates failing pregnancy
MISCARRIAGE
What is the first line management of miscarriage?
What are the indications?
What is the follow up?
- Expectant (wait 7–14d)
- <6w, not bleeding heavily, no signs of infection
- Urinary beta-hCG after 3w or repeat TVS if persistent or worse bleeding (or not started)
MISCARRIAGE
What is the medical management of a miscarriage?
What is the follow up?
- PV/PO synthetic prostaglandin misoprostol
- Contact HCP if no bleeding in 24h
- Urinary beta-hCG 3w after to exclude ectopic or molar
MISCARRIAGE
What are the risks of expectant and medical management?
- Bleeding continuing
- Increased pain
- Infected POC
- Failure
MISCARRIAGE
What are some indications for surgical management?
- Heavy bleeding
- Infection
- Failed other methods
MISCARRIAGE
What are the options for surgical management?
- Vacuum aspiration (suction curettage) under local as OP
- Surgical Mx (evacuation of retained products of conception) under general
MISCARRIAGE
What else may be given in the management of miscarriage?
- Anti-D to rhesus -ve women if >12w, heavily bleeding or surgical Mx
MISCARRIAGE
What is a recurrent miscarriage?
- ≥3 consecutive miscarriages in the first trimester with the same biological father
MISCARRIAGE
What are some causes of recurrent miscarriage?
- Antiphospholipid syndrome
- Hereditary thrombophilias (Factor V leiden deficiency, factor II prothrombin gene mutation, protein C/S deficiency)
- Uterine abnormalities (uterine septate, fibroids)
- Poor controlled chronic conditions (DM, thyroid, SLE)
MISCARRIAGE
What is antiphospholipid syndrome?
- Hypercoaguable state presenting with thrombosis + pregnancy issues (recurrent miscarriage)
- Associated with antiphospholipid antibodies
- Can occur on own or secondary to SLE
MISCARRIAGE
What is the management of antiphospholipid syndrome?
Low dose aspirin + LMWH
MISCARRIAGE
What are the investigations for recurrent miscarriage?
≥3 1st trimester, ≥1 in 2nd –
- Lupus anticoagulant, anti-cardiolipin + phospholipid antibodies
- Thrombophilia screen
- Pelvic USS for structural issues
- Cytogenic analysis of POC after 3rd miscarriage
- Parental blood for karyotyping
TERMINATING PREGNANCY
What is the legal framework for terminating pregnancies?
- 1967 Abortion Act (+ 1990 amendment which reduced gestation from 28 to 24w)
TERMINATING PREGNANCY
What are the requirements for an abortion?
- <24w
- Continuing pregnancy = great risk to physical or mental health of woman or existing children in family (clinical judgement)
TERMINATING PREGNANCY
When may an abortion be performed after 24w?
- Continuing is likely to risk mother’s life
- Prevents grave injury to physical or MH of woman
- Substantial risk of serious handicap for baby
TERMINATING PREGNANCY
What are the legal requirements for an abortion?
- 2 registered medical practitioners must sign to agree indication
- Must be registered medical practitioner in an approved premise
TERMINATING PREGNANCY
What is some pre-abortion care?
- Marie Stopes UK charity that provides abortion services (remote service if <10w gestation, phone consultation, meds issued remotely to take at home)
- Women should be offered counselling
TERMINATING PREGNANCY
What is the medical management of abortion?
- More appropriate in earlier pregnancy, <24w, <10w can be done at home
- Mifepristone (anti-progesterone) to halt pregnancy + relax cervix
- Misoprostol (prostaglandin analogue) 24-48h after for contractions
TERMINATING PREGNANCY
What is done before surgical management of abortion?
- Cervical priming with mifepristone, misoprostol or osmotic dilators (>14w insert into cervix + gradually expand as absorb fluid to open cervical canal)
TERMINATING PREGNANCY
What is the surgical management of abortion?
- Cervical dilatation + vacuum aspiration of uterus contents <14w
- Cervical dilatation + evacuation using forceps >14w
- Rh -ve >10w = anti-D
TERMINATING PREGNANCY
What is post-abortion care?
- Pregnancy test at 3w
- Contraception advice
- Complications = infection (#1), bleeding, pain, failure or damage to genital tract
HYPEREMESIS
How common is nausea and vomiting in pregnancy?
- Very, particularly early on starts in early first trimester, peaks 8–12w + resolves 16–20w
HYPEREMESIS
What is believed to be responsible for N+V in pregnancy?
- Placental beta-hCG
HYPEREMESIS
When is N+V worse?
more severe in molar + multiple pregnancies where beta-hCG high
HYPEREMESIS
What are some associations of hyperemesis gravidarum?
- nulliparity,
- hyperthyroid,
- obesity,
- decreased in smokers
HYPEREMESIS
What is the clinical presentation of hyperemesis gravidarum?
- Severe + excessive N+V
- Associated with dehydration, ketosis + weight loss
HYPEREMESIS
What are the complications?
May lead to complications like Mallory-Weiss tear
HYPEREMESIS
What is the diagnostic triad for hyperemesis gravidarum?
Triad –
- >5% weight loss compared to before pregnancy
- Dehydration
- Electrolyte imbalance
HYPEREMESIS
How is severity assessed?
Pregnancy-Unique Quantification of Emesis (PUQE) –
- <7 mild,
- 7-12 mod,
- >12 severe
HYPEREMESIS
What are some investigations for hyperemesis gravidarum?
- Urine dipstick for ketones, MSU to exclude UTI
- FBC (raised haematocrit)
- U+Es (electrolyte imbalances + dehydration)
- May have hypochloraemic metabolic alkalosis
- Higher beta-hCG levels
- USS to reassure + exclude multiple/molar
HYPEREMESIS
What would warrant hospital or EPAU admission?
- Unable to tolerate PO antiemetics or fluids
- > 5% weight loss compared to before pregnancy
- Ketones present in dipstick (++ significant)
HYPEREMESIS
What is the inpatient management of hyperemesis gravidarum?
- Monitor U+Es
- NBM until tolerate PO = IV fluids + anti-emetics
- Vitamin supplements (incl. thiamine), may need artificial nutrition to prevent Wenicke-Korsakoff
- Thromboprophylaxis with TED stockings + LMWH
- Small + frequent meals when eating allowed
HYPEREMESIS
What is the community management of hyperemesis gravidarum?
- 1st line antiemetic = promethazine or cyclizine (anti-histamines)
- 2nd line = ondansetron (5-HT3 antagonist) or metoclopramide (dopamine antagonist)
HYPEREMESIS
What alternative management can be used?
Complementary therapies like ginger or wrist acupressure
ANTENATAL APPTS
In terms of antenatal care…
i) who is in charge of low risk pregnancies?
ii) high risk pregnancies?
iii) how many visits?
iv) what would you do if reduced foetal movements?
i) Midwife-led with GP input
ii) Doctor/consultant led with midwives alongside
iii) 10 if nulliparous, subsequent 7
iv) Handheld doppler for heartbeat – USS if not heard, CTG if present
ANTENATAL APPTS
Define…
i) gestational age
ii) estimated date of delivery
iii) gravidity
iv) parity
i) duration of pregnancy starting from date of LMP
ii) 40w gestation
iii) Total # of pregnancies
iv) number of births ≥24w regardless of outcome
ANTENATAL APPTS
When is the first visit?
What is done?
Booking 8–12w –
- General info (diet, alcohol, smoking, folic acid + vitamin D advice, antenatal classes, family origin questionnaire
- FBC, blood group, rhesus status, haemoglobinopathies
- HIV, hep B + syphilis screening offered
- Urine MC&S for asymptomatic bacteriuria
ANTENATAL APPTS
What is the recommended amount of folic acid?
- ALL 400mcg
- 5mg if – AEDs, coeliac, DM, >30kg/m^2, NTD risk
ANTENATAL APPTS
When is the dating scan done?
What happens?
11–13+6w –
- Confirm viability
- Singleton/multiple
- Estimate gestational age with crown rump length (top of head > bottom of buttocks)
- Detect major structural abnormalities like anencephaly
- Offer combined test
ANTENATAL APPTS
When is the anomaly scan?
What happens?
18–20+6w –
- Detect major abnormalities (NTD, CHD, CNS abnormality, renal agenesis)
- Around 20w foetal movements start + continue (refer if none by 24w)
ANTENATAL APPTS
After the anomaly scan, routine care is given but at what times?
- 25w (primis)
- 28w (all)
- 31w (primis)
- 34w (all)
- 36w (all)
- 38w (all)
- 40w (primis)
- 41w (all)
ANTENATAL APPTS
What routine care is given at 25w for primis?
- BP, urine dipstick, symphysis-fundal height (after 20w should correlate to gestational age ± 2cm)
ANTENATAL APPTS
What routine care is given at 28w?
- BP, urine dipstick, SFH
- OGTT if risk factors for GDM
- Second screen for anaemia (FBC), blood group + rhesus status
- First dose of anti-D prophylaxis if Rh-ve
ANTENATAL APPTS
What routine care is given at…
i) 31w (primis)?
ii) 34w?
iii) 36w?
i) BP, urine dipstick, SFH
ii) BP, urine dipstick, SFH + second dose of anti-D if Rh-ve
iii) BP, urine dipstick, SFH, check presentation (?ECV), info about breastfeeding, vitamin K + baby blues
ANTENATAL APPTS
What routine care is given at…
i) 38w?
ii) 40w (primis)?
iii) 41w?
i) BP, urine dipstick, SFH
ii) BP, urine dipstick, SFH, discuss options for prolonged pregnancy
iii) BP, urine dipstick, sFH, discuss induction
ANTENATAL SCREENING
What pre-test information should be provided before antenatal screening?
- Conditions screened for
- When + how test carried out
- How reliable test is
- What results mean + options
- False +ve/-ve + detection rates
ANTENATAL SCREENING
What are the 3 main syndromes screened for in pregnancy?
- Patau’s (trisomy 13)
- Edward’s (trisomy 18)
- Down’s (trisomy 21)
ANTENATAL SCREENING
What screening is offered in early pregnancy and when?
Combined test (11–13+6w) –
- Nuchal translucency (thickness of back of foetus’ neck on USS)
- Beta-hCG
- Pregnancy associated plasma protein-A (PAPP-A)
ANTENATAL SCREENING
What results indicate higher risk for…
i) nuchal translucency?
ii) beta-hCG?
iii) PAPP-A?
What else is taken into account?
i) >6mm
ii) Higher result
iii) Lower result
- Maternal age, USS crown rump length, detection rate 85%
ANTENATAL SCREENING
What screening is offered if the mother is too late for the combined test and when?
Triple or quadruple test 15–20w but only tests for Down’s syndrome –
- Beta-hCG
- Alpha-fetoprotein
- Oestriol
- Inhibin (quadruple)
ANTENATAL SCREENING
What results indicate higher risk for…
i) beta-HCG?
ii) AFP?
iii) oestriol?
iv) inhibin?
i) Higher result
ii) Lower result
iii) Lower result
iv) Higher result
ANTENATAL SCREENING
What risk score would warrant further invasive tests?
What are those tests?
- > 1:150 = screen +ve
- Amniocentesis
- Chorionic villus sampling (CVS)
AMNIOCENTESIS
What is amniocentesis?
It involves aspiration of amniotic fluid which contains foetal cells shed from the skin and gut.
It is performed transabdominally with ultrasound guidance.
AMNIOCENTESIS
When is amniocentesis performed?
from 15 weeks onwards
AMNIOCENTESIS
What are the indications for amniocentesis?
o For karyotyping if screening tests suggest aneuploidy.
o DNA analysis if parents are carriers of an identifiable mutation, like CF or thalassaemia.
o For enzyme assays looking for inborn errors of metabolism.
o For diagnosis of fetal infections such as CMV and toxoplasmosis.
AMNIOCENTESIS
What are the benefits of amniocentesis?
o Lower procedure-attributed miscarriage rate than CVS (71%).
o Less risk of maternal contamination or placental mosaicism
AMNIOCENTESIS
What are the risks of amniocentesis?
o Miscarriage (1%)
o Failure to culture cells
o Full karyotyping may take 3wks.
CHORIONIC VILLUS SAMPLING
What is chorionic villus sampling?
Involves aspiration of some trophoblastic cells from the placenta under USS guidance.
It is used for karyotyping
Is usually performed transabdominally, occasionally transcervically.
CHORIONIC VILLUS SAMPLING
when is chorionic villus sampling performed?
Usually between 10-13 weeks
CHORIONIC VILLUS SAMPLING
what are the indications for chorionic villus sampling?
o For karyotyping if 1st trimester screening test suggests high risk for aneuploidy.
o For DNA analysis if parents are carriers of an identifiable gene mutation such as cystic fibrosis or thalassaemia.
CHORIONIC VILLUS SAMPLING
what are the benefits of chorionic villus sampling?
Allows 1st trimester TOP if an abnormality is detected:
o Can be performed surgically.
o Can be done before the pregnancy has become physically apparent.
CHORIONIC VILLUS SAMPLING
what are the risks of chorionic villus sampling?
o Miscarriage as a result of CVS is estimated at 1%.
o Increases risk of vertical transmission of blood-borne viruses such as HIV and hepatitis B.
o False negative results (rare) from contamination with maternal cells—especially with DNA
analysis requiring PCR.
o Placental mosaicism producing misleading results—estimated at <1%.
ANTENATAL SCREENING
What other testing is available in the private sector?
What does it involve?
- Non-invasive prenatal testing
- Analyses fragments of foetal DNA in maternal blood
- 99% accurate, done from 10w
APH
What is an antepartum haemorrhage (APH)?
- Genital tract bleeding after 24w gestation
APH
What are the causes of APH?
Majority idiopathic, dangerous causes –
- Placental abruption or praevia
- Vasa praevia
- Morbidly adherent placenta
APH
What are some generic investigations for APH?
- Exclude placenta praevia with USS
- Kleihauer test to confirm transplacental blood loss from foetus>mother
APH
What are some complications of APH?
- PPH, DIC
- Premature labour
- ITU admission
- Maternal or foetal death
- Sheehan’s syndrome
PLACENTA PRAEVIA
What is placenta praevia?
- When placenta is inserted wholly, or in part, into the lower segment of the uterus (low lying placenta)
PLACENTA PRAEVIA
What are the grades of placenta praevia?
Minor (I or II) –
- I = reaches lower segment but not internal os
- II = reaches internal os but doesn’t cover
Major (III or IV) –
- III = covers internal os before dilation (not when dilated)
- IV = completely covers internal os
- Cervical effacement + dilation > catastrophic bleeding + potential maternal + foetal death
PLACENTA PRAEVIA
What are some risk factors for placenta praevia?
- Embryos more likely to implant on lower segment scar from previous c-section
- Multiple pregnancy
- Multiparity
- Previous praevia
- Assisted conception
PLACENTA PRAEVIA
What is the clinical presentation of placenta praevia?
- PAINLESS PV bleeding, BRIGHT RED blood, shock IN proportion to visible loss
- Foetus may have abnormal lie + presentation (breech + transverse)
- Uterus is not tender
PLACENTA PRAEVIA
What are the investigations for placenta praevia?
- TV USS safe + more accurate
- Can be Dx on routine antenatal USS (20w)
- Repeat USS at 36w if minor or 32w if major
- If over or close to internal os repeat scans every 2w
PLACENTA PRAEVIA
What are some complications of placenta praevia?
- PPH
- Placenta accreta or percreta
PLACENTA PRAEVIA
What is the normal management of placenta praevia?
- Asymptomatic can stay at home if access to hospital, aware of risks/Sx, companion (rest + avoid intercourse)
- <20mm from os = elective c-section ≥38w or earlier if bleeding does not settle
- Anti-D if Rh-ve
PLACENTA PRAEVIA
What is the acute management of placenta praevia?
- ABCDE + admission
- IV access, fluids (crystalloid), X-match blood, inform senior team + paeds
- Foetal monitoring with CTG ± delivery
- Steroids if <34w gestation
PLACENTAL ABRUPTION
What is placental abruption?
- Placenta prematurely separates (in part or fully) from uterus wall leading to APH from where the placenta was previously attached
- Blood can accumulate behind placenta in uterine cavity or exit via cervix
PLACENTAL ABRUPTION
What are the major risk factors for placental abruption?
What are some other risk factors?
- IUGR, pre-eclampsia or pre-existing HTN, maternal smoking + previous abruption
- Cocaine use, multiple pregnancy or high parity, trauma
PLACENTAL ABRUPTION
What are the 2 types of abruption?
- Concealed = cervical os closed so haemorrhage remains in uterus
– Maternal shock out of proportion with visible loss may > underestimation - Revealed = PV bleeding
PLACENTAL ABRUPTION
What is the clinical presentation of placental abruption?
- Sudden onset severe abdo PAIN which is continuous
- PV bleeding often DARK red
- Maternal shock (hypotension, tachycardia = adverse signs)
- Foetal distress common on CTG (absent or abnormal FHR)
- Posterior placenta may cause severe backache
PLACENTAL ABRUPTION
What are some investigations for placental abruption?
- Tender “woody” uterus on palpation (blood invading myometrium)
- FBC, coagulation, X-match (may need catheter for urine output + U+Es for renal function)
- USS + CTG for foetal wellbeing + exclude praevia
PLACENTAL ABRUPTION
What are the maternal and foetal complications of placental abruption?
- Shock, DIC, renal failure, PPH
- IUGR, hypoxia + death
PLACENTAL ABRUPTION
What is the general management of placental abruption?
- Mum + foetus stable at <36w then admit + observe carefully, induce after 36w with amniotomy aiming for vaginal delivery, steroids if <34w
- Anti-D if Rh-ve
PLACENTAL ABRUPTION
What is the management of acute placental abruption?
- A–E resus
- IV access, fluids, ABO Rh compatible or O-ve blood
- Mum unstable, foetal distress or heavy bleeding = emergency c-section
- Steroids if <34w
MUM COMES FIRST
ADHERED PLACENTA
What is a morbidly adhered placenta?
- The chorionic villi attach to the myometrium rather than being restricted within the decidua basalis
ADHERED PLACENTA
What are the different types of morbidly adhered placenta?
- Accreta = placenta invades into superficial myometrium
- Increta = placenta invades deeper through the myometrium
- Percreta = placenta invades through myometrium, into nearby organs of abdomen (bladder, bowel)
ADHERED PLACENTA
What are some risk factors for a morbidly adhered placenta?
- Previous c-sections (placenta attaches to site)
- Myomectomy
- Surgical TOP
ADHERED PLACENTA
What are some investigations for a morbidly adhered placenta?
- USS may show loss of definition between wall of uterus + abnormal vasculature
- MRI scan if degree of adherence uncertain
ADHERED PLACENTA
What are some complications of a morbidly adhered placenta?
- Poor placental separation may occur > difficult to deliver placenta after baby delivered > retained products > infection risk
- Delivery risks = PPH, transfusion, caesarean hysterectomy, ITU
ADHERED PLACENTA
What is the management of a morbidly adhered placenta?
- Elective LSCS at 36–37w
- ?Caesarean hysterectomy
- ?Leave in situ (expectant)
- ?Uterus preserving surgery (resecting part of myometrium + placenta)
ADHERED PLACENTA
What is the acute management of a morbidly adhered placenta?
- Blood + blood products available
- Local ITU availability
- Tamponade with balloon
- Hysterectomy last resort
VASA PRAEVIA
What is vasa praevia?
- Major foetal vessels run in membranes below the presenting foetal part, so they present before the foetus, unsupported by placental tissue or umbilical cord
- Exposed mean prone to rupture + bleed
VASA PRAEVIA
What are some risk factors for vasa praevia?
- Placenta praevia
- Multiple pregnancy
- IVF pregnancy
- Bilobed placentas
VASA PRAEVIA
What is the clinical presentation of vasa praevia?
- PV bleed straight after rupture of foetal membranes > rapid foetal distress
- CTG abnormalities (bradycardia) with high foetal mortality
- No major maternal risk just major foetal risk (massive haemorrhage)
VASA PRAEVIA
What is the management of vasa praevia?
- A–E approach, manage bleeding
- Deliver c-section (elective if antenatally diagnosed, emergency if present with bleeding)
PRE-ECLAMPSIA
What is pre-eclampsia?
- Pregnancy induced HTN + proteinuria at >20w gestation
- Results due to abnormal development of the placenta
PRE-ECLAMPSIA
How can pre-eclampsia be classified?
- Mild-mod = pre-eclampsia without severe HTN (<160/110) and NO Sx, biochemical or haematological impairment
- Severe = pre-eclampsia w/ severe HTN ± Sx ± biochem ± haem impairment
- Early <34w, late >34w
PRE-ECLAMPSIA
What is the normal physiology of the placenta?
- Spiral arteries dilate + develop into large utero-placental arteries, supplying lots of blood to the endometrium > placenta + foetus
PRE-ECLAMPSIA
What is the pathophysiology of pre-eclampsia?
- Spiral arteries do not remodel + dilate but become fibrous so utero-placental arteries deliver less blood > placental ischaemia
PRE-ECLAMPSIA
What is the result of placental ischaemia?
- Pro-inflammatory protein + thromboplastin release leads to endothelial damage > vasoconstriction, clotting dysfunction + increased vascular permeability
- Ultimately leads to poor renal perfusion > RAAS activation > HTN, proteinuria ± oedema > pre-eclampsia + eclampsia (if continues)
PRE-ECLAMPSIA
What are the…
i) high risk
ii) moderate risk
factors for pre-eclampsia?
i) Pre-existing HTN, previous pre-eclampsia, CKD, autoimmune (SLE, T1DM)
ii) Nulliparity, multiple pregnancy, >10y pregnancy interval, FHx, >40y, BMI >35kg/m^2
PRE-ECLAMPSIA
What are the 2 main causes of symptoms in pre-eclampsia?
- Local areas of vasospasm leading to hypoperfusion
- Oedema due to increased vascular permeability + hypoproteinaemia
PRE-ECLAMPSIA
What symptoms are caused by local areas of vasospasm and what area is affected?
Renal = glomerular damage (low GFR) –
- Oliguria + proteinuria
Retinal –
- Visual disturbances (blurred, flashing lights, scotoma)
Liver = injury + swelling stretches liver capsule –
- RUQ or epigastric pain
PRE-ECLAMPSIA
What symptoms are caused by oedema?
- Face, hands + legs (generalised)
- SOB + cough (pulmonary)
- Headaches, confusion + seizures in eclampsia (cerebral)
PRE-ECLAMPSIA
What are the signs of pre-eclampsia?
- Raised BP + proteinuria are hallmarks
- Rapid weight gain, RUQ tenderness
- Ankle clonus (brisk reflexes normal in pregnancy but not clonus)
- Papilloedema if severe
PRE-ECLAMPSIA
How can a diagnosis of pre-eclampsia be made?
- BP ≥140/90mmHg
- Proteinuria in a 24h collection (>0.3g) or dipstick with +
PRE-ECLAMPSIA
What blood investigations would you do in pre-eclampsia?
- FBC with platelets (thrombocytopenia)
- Serum uric acid levels (raised due to renal issues)
- LFTs (elevated liver enzymes ALT + AST)
PRE-ECLAMPSIA
What other investigations could you perform in pre-eclampsia?
- Proteinuria on dipstick (++ or +++ is severe)
- Protein:Creatinine ratio (PCR) ≥30ng/nmol = significant proteinuria
- Accurate dating + USS to assess foetal growth
PRE-ECLAMPSIA
What are the 2 big complications of pre-eclampsia?
- Eclampsia
- HELLP syndrome
PRE-ECLAMPSIA
What is eclampsia?
What causes it?
- Generalised tonic-clonic seizures in a patient with a Dx of pre-eclampsia
- Hypoalbuminaemia > hypovolaemia > cerebral hypoperfusion
PRE-ECLAMPSIA
What is the management of eclampsia?
IV magnesium sulfate to prevent + treat seizures –
- Reduces DIC risk as reduced platelet aggregation
- Continue 24h after last seizure or delivery
Treat HTN with labetalol 1st line or nifedipine
Stabilise mum and delivery baby
PRE-ECLAMPSIA
What needs to be monitored when giving magnesium sulfate?
- Magnesium levels for toxicity
- Reduced reflexes, confusion + respiratory depression
- Calcium gluconate first line
HELLP
What is HELLP syndrome?
HELLP syndrome is a subtype of severe pre-eclampsia characterized by
- hemolysis (H),
- elevated liver enzymes (EL),
- low platelets (LP).
Usually occurs within 7 days of delivery.
HELLP
How does HELLP syndrome present?
➢ Nausea/vomiting
➢ Hypertension
➢ Brisk tendon reflexes
➢ RUQ/Epigastric pain
➢ General malaise/headache
➢ Oedema/bleeding
➢ Visual problems, jaundice
HELLP
what other condition is HELLP associated with?
- 10% have antiphospholipid syndrome
HELLP
what are the risk factors for HELLP?
➢ White ethnicity
➢ Maternal age >35 yrs.
➢ Obesity
➢ Chronic hypertension
➢ DM
➢ Autoimmune disorders
➢ Abnormal placentation and multiple gestation
➢ Previous pregnancy with preeclampsia
HELLP
what are the investigations for HELLP?
➢ FBC with platelets: hemolysis,
elevated LFT, low platelets
➢ Peripheral blood smear, serum LDH, uric acid
➢ LFT, Bilirubin
➢ Fetal ultrasound
HELLP
what is the management for HELLP?
➢ Seizure prophylaxis (magnesium sulfate), IV dexamethasone, labetalol. IM beclametasone
when patient <36wks
➢ Delivery is definitive treatment (should be done when patient is 37+ wks)
PRE-ECLAMPSIA
What are some other important complications of pre-eclampsia?
- DIC, CVA (haemorrhagic)
- Multi-organ failure (renal, hepatic)
- Foetus = IUGR (poorly perfused placenta), prematurity, placental abruption
PRE-ECLAMPSIA
What should be given to women who are at high or moderate risk of pre-eclampsia and why?
- 75mg aspirin PO OD at 12w until birth
- Spiral arteries form around 12w so thought to help them develop
PRE-ECLAMPSIA
What medical treatment can be given for pre-eclampsia?
Treat HTN with –
- PO Labetalol first line (can use IV if severe + inpatient)
- PO nifedipine (used if asthmatic)
- Hydralazine too
- ACEi = CONTRAINDICTAED
PRE-ECLAMPSIA
What is the criteria for outpatient management of pre-eclampsia?
What care is given?
- BP <160/110, no or low proteinuria (≤+, <0.3g/24h) + no symptoms
- Weekly review of bloods, twice weekly mother + foetal evaluation (HBPM + urine)
- Any changes > hospital
PRE-ECLAMPSIA
What is the definitive cure of pre-eclampsia?
What are the indications?
What method is preferred?
- Delivery (around 36w)
- Mother = liver/renal failure, HELLP, eclampsia, severe Sx
- Foetal = severe IUGR, oligohydramnios, abnormal CTG
- PV + neuraxial techniques for spinal/epidural preferred
PRE-ECLAMPSIA
What is the management of pre-eclampsia during delivery?
- Regular investigations (BP, urinalysis, bloods, CTG, fluid balance chart (restrict if severe)
- BP control (IV labetalol first line of nifedipine if asthmatic)
- IV magnesium sulfate prophylaxis during labour + 24h after
PRE-ECLAMPSIA
What are the 3 other types of HTN in pregnancy conditions?
- Chronic HTN
- Gestational/pregnancy induced HTN
- Pre-eclampsia superimposed on chronic HTN
PRE-ECLAMPSIA
What is chronic HTN?
- HTN diagnosed prior to pregnancy, before 20w gestation or that develops during pregnancy but does not resolve postpartum
PRE-ECLAMPSIA
What is gestational or pregnancy induced HTN?
- New HTN >20w gestation with NO proteinuria that resolves after giving birth
- 25% will progress to pre-eclampsia
PRE-ECLAMPSIA
What is pre-eclampsia superimposed on chronic HTN?
- HTN + no proteinuria <20w with new onset proteinuria after 20w
- HTN + proteinuria <20w with sudden rise in proteinuria or BP when HTN was well controlled, or development of thrombocytopenia or abnormal ALT/AST
IUGR
What is intrauterine growth restriction (IUGR)?
- Baby has not maintained its growth potential (slows or creases)
- I.e. drops below centile line it was following > pathological
IUGR
What are the two types of IUGR?
- Symmetrical = entire body is proportionately small, tends to be seen in early onset IUGR, TORCH + chromosomal abnormalities
- Asymmetrical = undernourished foetus that is compensating by directing most of its energy to maintain growth of vital organs like brain + heart
IUGR
What might be seen in asymmetrical IUGR?
Head-sparing effect –
- Normal head size but small abdominal circumference + thin limbs
- Mostly secondary to placental insufficiency
IUGR
What is small for gestational age (SGA)?
- Estimated foetal weight (EFW) or abdominal circumference (AC) below 10th centile for their gestational age
- May be constitutionally small with no pathology identified (parental height)
IUGR
What is low birth weight?
- Baby born with a weight <2.5kg (regardless of gestational age)
IUGR
What are the 3 broad categories causing IUGR?
- Placental insufficiency (most common cause)
- Maternal factors
- Foetal factors
IUGR
What are some placental causes of IUGR?
- Abnormal trophoblast invasion (pre-eclampsia, placenta accreta)
- Infarction, abruption, location (praevia)
IUGR
What are some maternal causes of IUGR?
- Chronic disease (HTN, cardiac, CKD)
- Substance abuse (cocaine, alcohol) smoking, previous SGA baby
- Autoimmune
- Low socioeconomic status
- > 40
IUGR
What are some foetal causes of IUGR?
- Genetic abnormalities (trisomies 13/18/21, Turner’s)
- Congenital infections (TORCH)
- Multiple pregnancy
IUGR
What are some complications of IUGR?
- Hypoglycaemia
- Risk of necrotising enterocolitis
- Neonatal jaundice
- Hypothermia
- Respiratory issues
- Long-term sequelae include T2DM, HTN, obesity, behavioural problems, CP
IUGR
What causes…
i) hypoglycaemia?
ii) necrotising enterocolitis?
iii) neonatal jaundice?
i) Blood directed away from liver>brain so glycogen stores don’t develop adequately
ii) Reduced blood to bowel
iii) Compensatory polycythaemia for reduced oxygen supply from mother if reduced placental perfusion
IUGR
What causes…
i) hypothermia?
ii) respiratory problems?
i) No fat stores developed so cannot thermoregulate, large surface area
ii) Kidney hypoperfusion > decreased urine output > oligohydramnios > inadequate lung development
IUGR
What are the investigations for IUGR?
- BP + urine dipstick (?pre-eclampsia)
- Karyotyping (?foetal)
- Infection screen, TORCH (?infection)
IUGR
When would you be concerned about IUGR?
What would you do?
- SFH < 10th centile, slow or static growth or crossing centiles
- Refer for serial growth scans (USS) every 2w, umbilical artery doppler + amniotic fluid volume
- MCA doppler performed after 32w
IUGR
What is umbilical artery doppler for?
What happens if it’s abnormal?
- Assesses if baby is getting enough blood
- Abnormal = twice weekly review
IUGR
What is the management (and the indications of management) for IUGR?
Consider delivery (corticosteroids if <34w to mature foetal lungs) if –
- Static growth on growth charts
- Absent end-diastolic flow (AEDF, abnormal doppler)
- Abnormal CTG (foetal distress)
- MCA doppler PI <5% delivery by 37w (early sign of foetal hypoxia in SGA, shows increased diastolic flow > head-sparing effect)
MULTIPLE PREGNANCY
What is meant by a monozygotic multiple pregnancy?
identical (come from single zygote)
MULTIPLE PREGNANCY
What is meant by dizygotic multiple pregnancy?
non-identical (come from two different zygotes > diamniotic + dichorionic)
MULTIPLE PREGNANCY
What is meant by mono/diamniotic multiple pregnancy?
share/two separate amniotic sacs
MULTIPLE PREGNANCY
What is meant by a mono/dichorionic multiple pregnancy?
share/two separate placentas
MULTIPLE PREGNANCY
What are some predisposing factors to multiple pregnancies?
- Previous twins,
FHx,
increasing parity + maternal age,
IVF,
race (Afro-Caribbean)
MULTIPLE PREGNANCY
What is one way of preventing them?
No more than 2 embryos transferred per IVF cycle
MULTIPLE PREGNANCY
What is the clinical presentation of multiple pregnancies?
- Uterus larger than expected for dates
- May suffer from hyperemesis gravidarum
- Multiple foetal poles may be palpable at >24w
- Multiple foetal hearts on auscultation
- Majority diagnosed on dating scan
MULTIPLE PREGNANCY
What are some maternal and foetal complications of multiple pregnancy?
- Anaemia, HTN, APH + PPH, preterm birth, stillbirth
- Twin-twin transfusion syndrome, IUGR, polyhydramnios, malpresentation
MULTIPLE PREGNANCY
What is twin-twin transfusion syndrome?
- Associated with monoamniotic monochorionic twins
- Recipient gets majority of blood so is larger with polyhydramnios
- Donor is starved of blood + can become anaemic, recipient worse off (hydrops)
- Severe cases > laser ablation of connecting vessels
MULTIPLE PREGNANCY
What is the antenatal care for multiple pregnancies?
- High risk –5mg folic acid, iron supplements to prevent anaemia
- Additional scans for growth restriction + twin-twin transfusion (2w from 16w for monochorionic, 4w from 20w for dichorionic)
MULTIPLE PREGNANCY
What is the management of multiple pregnancies?
- Steroids if <34w
- Monochorionic/amniotic twins = elective c-section 32-34w
- Diamniotic twins = 37–38w, vaginal if presenting twin cephalic but may need c-section for second
OLIGOHYDRAMNIOS
What is oligohydramnios?
What is it defined as?
- Abnormally low levels of amniotic fluid during pregnancy
- Amniotic fluid index <5th centile for gestational age
OLIGOHYDRAMNIOS
What are some causes of oligohydramnios?
- PROM or SROM
- Renal agenesis (Potter’s syndrome) or non-functional kidneys
- Placental insufficiency (pre-eclampsia, post-term gestation) as blood redistributed to brain so reduced urine output
- Genetic anomalies
- Obstructive uropathy
OLIGOHYDRAMNIOS
What is the clinical presentation of oligohydramnios?
- May have experienced leaking fluid or feeling damp
- Measure SFH
- Sterile speculum may show pool of liquor in birth canal
OLIGOHYDRAMNIOS
What are some investigations for oligohydramnios?
- USS foetus = AFI or maximum pool depth calculated + doppler
- TORCH screen as may be infection
- Test fluid for IGFBP-1 or PAMG-1 if concerned about PPROM.
- Foetal CTG for signs of distress
OLIGOHYDRAMNIOS
What are some complications of oligohydramnios?
- 2nd trimester = poor prognosis due to PPROM leading to premature delivery + pulmonary hypoplasia > resp distress
- Muscle contractures as amniotic fluid allows foetal to move limbs in utero
OLIGOHYDRAMNIOS
What is the management of oligohydramnios?
- Treat as PROM if present
- Frequent monitoring of growth for IUGR
POLYHYDRAMNIOS
What is amniotic fluid (liquor)?
- Fluid between baby + amnion (sac) acts as a cushion around foetus to protect it from trauma
- Foetus can swallow amniotic fluid which helps create urine + meconium
POLYHYDRAMNIOS
What is polyhydramnios?
- Abnormally large levels of amniotic fluid
- AFI >95th centile for gestational age
POLYHYDRAMNIOS
What are the causes of polyhydramnios?
- Increased foetal urine production (maternal DM), twin-twin transfusion, foetal hydrops
- Foetal inability to swallow/absorb amniotic fluid (GI tract obstruction e.g. duodenal atresia, foetal neuro/muscular issues)
POLYHYDRAMNIOS
How may polyhydramnios present?
- Maternal discomfort
- LGA
- Foetal parts hard to palpate
- Taut uterus
POLYHYDRAMNIOS
What are the investigations for polyhydramnios?
- Exclude GDM with OGTT
- USS foetus to calculate AFI or maximum pool depth
- TORCH screen as can be cause by viral infections