Other Flashcards
What are the RFs for high risk/abnormal pregnancies?
- extremities of age
- pre pregnancy weight < 45kg or obesity
- height <5ft
- incompetent cervix
- uterine malformations
- small pelvis
- single woman
- drugs
What are the pre-existing conditions that make pregnancies high risk?
- HT
- seizures
- thyroid disease
- auto-immune conditions
- infections
- kidney disease
What are the conditions in pregnancy that complicate it?
- pre eclampsia
- kidney infection
- infections
- Rh incompatibility
What investigations should be done in high risk pregnancies?
- Clinical assessment
- Urine: protein: creatinine, nitrates, leucocytes and MSU
- Bloods: FBC, U&Es, lFTs, OGTT
- USS
What managements are there for high risk pregnancies?
- Surveillance for high risk patients
- Offer high dose of folate (5mg)
- Offer low dose aspirin as prophylaxis
Define oligohydramnios
Decreased volume of amniotic fluid, below 5th centile, or deepest pool<2cm.
What are the RFs for oligohydramnios?
- ROM
- Placental insufficiency
- Foetal urinary tract malformation
- Chr abnormality
- Post-term pregnancy
- IUGR
- Pre-eclampsia
- Medication
- Multiple pregnancy
How would oligohydramnios present?
history of fluid leak PV
commonly asymptomatic
What investigations should be done to assess oligohydramnios?
- USS to assess liquor volume
- CTG: foetal wellbeing
How should we manage oligohydramnios?
- Term: delivery is appropriate (IOL if indicated)
- Pre-term: monitor with serial USS for growth, liquor volume and dopplers, regular CTGs, deliver if further abnormalities arise
What are the complications of oligohydramnios?
- Labour: Emergency C-Section, increased incidence of CTG abnormalities
- Neonate: Pulmonary hypoplasia and limb deformities
Define polyhydramnios.
Polyhydramnios: Increased volume of amniotic fluid >95th centile or deepest pool > 8cm.
What are the RFs for polyhydramnios?
- Idiopathic
- Failure of foetal swallowing
- Foetal GI tract abnormality (atresia)
- Congenital infections
- Foetal polyuria (diabetes)
How would polyhydramnios present?
Symptoms of underlying cause, maternal discomfort
How should we investigate polyhydramnios?
- USS: Diagnosis and assessment of liquor volume, foetal growth, umbilical artery doppler, exclude foetal anomalies
- Other: exclude maternal diabetes
How do we manage polyhydramnios?
- Ante-natal monitoring
- Amnioreduction: if causing a problem
- Cyclo-oxygenase inhibitor: used to reduced foetal urine output
- Optimise diabetes control
What are the complications of polyhydramnios?
- PTL
- Malpresentation
- Placental abruption
- Cord prolapse
- Complications of underlying pathology
- PPH
- Increased risk of C-section
Define small for gestational age.
Small-for-gestational age (SGA) refers to an infant born with a birth weight less than the 10th centile.
What are the causes of SGA?
- Maternal:
- HT
- pre-eclampsia
- diabetes
- drugs
- renal disease
- thrombophilia
- maternal age
- pemphigoid gestionis
- Foetal
- chromosomal abnormality
- infection (CMV, rubella)
- multiple pregnancy
- Other: Placental Insufficiency
How do we classify SGA?
- Symmetrical: head and body and proportionally small
- normally early onset, seen in chromosomal abnormalities
- Asymmetrical: Typically later onset, abdominal circumference disproportionately smaller than the head
- seen with placental insufficiency
How common are SGAs?
3-5% of pregnancies
What are the RFs for SGA?
- Previous SGA baby
- Obesity
- Smoking
- Diabetes
- Existing hypertension
- Pre-eclampsia
- Older mother (over 35 years)
- Multiple pregnancy
- Low pregnancy‑associated plasma protein‑A (PAPPA)
- Antepartum haemorrhage
- Antiphospholipid syndrome
How do we assess foetal size in SGA?
Symphysis-fundal height
- Serial measurement at each antenatal appt from 24 weeks improves prediction of SGA neonate
- Plot SFH on customised chart (ethnic group, weight, height and parity)
- Refer women in whom SFH measurement is inaccurate (BMI>35, large fibroids, hydramnios) for serial growth USS
Best method for detecting SGA and FGR
- Fetal abdominal circumference or estimated fetal weight <10th centile
USS:
- Umbilical Artery Doppler - abnormal if end diastolic flow absent or reversed
- Liquor volume
- Anomaly scan
- Middle cerebral artery doppler (may show redistribution of blood to brain)
CTG
Define Severe SGA.
Fetus below 3rd centile
Low birth weight
BW of less than 2500 g
What are the 2 causes of SGA?
- Constitutionally small - growing appropriately on the growth chart
- Fetal growth restriction - IUGR → small foetus due to a pathology reducing the amount of nutrients and oxygen being delivered to the foetus through the placenta
What are the causes of FGR?
- Placenta mediated
- Non-placenta mediated (usually genetic or structural abnormality)
What are the placenta mediated growth restriction causes?
- Idiopathic
- Pre-eclampsia
- Maternal smoking
- Maternal alcohol
- Anaemia
- Malnutrition
- Infection
- Maternal health conditions
What are the non-placenta mediated growth restriction causes?
- Genetic abnormalities
- Structural abnormalities
- Fetal infection
- Errors of metabolism
What are other signs of FGR?
- Reduced amniotic fluid volume
- Abnormal Doppler studies
- Reduced fetal movements
- Abnormal CTGs
What are the complications of FGR?
Short term complications of fetal growth restriction include:
- Fetal death or stillbirth
- Birth asphyxia
- Neonatal hypothermia
- Neonatal hypoglycaemia
Growth restricted babies have a long term increased risk of:
- Cardiovascular disease, particularly hypertension
- Type 2 diabetes
- Obesity
- Mood and behavioural problems
What are the minor and major risks of SGA? How does it change monitoring?