Large for dates Flashcards
What is the definition of large for dates
symphyseal fundal height >2cm for gestational age
list causes for being large for dates
wrong dates foetal macrosomia polyhydramnios diabetes mellitus multiple pregnancy
What might happen if the dates are wrong
Late booker
concealed pregnancy
travelled from abroad
What does foetal macrosomia mean
big baby
How do you diagnose foetal macrosomia
USS scan
estimated foetal weight (EFW) >90th centile
abdominal circumference (AC) >97th centile
what are the risks of having a big baby
anxiety to mother and clinician
labour dystocia
shoulder dystocia
post partum haemorrhage
When is diagnosing foetal macrosomia most accurate
<38 weeks
USS overestimates baby’s size, true or false
TRUE
Management of foetal macrosomia
exclude diabetes
reassure
surveillance
discuss delivery options
if a baby is >4.5kg, what delivery option should be considered
c-section
What is polyhydramnios
excess amniotic fluid
How do you diagnose polyhydramnios
Amniotic Fluid index AFI > 25cm
Deepest Pool DP >8cm
Subjective impression
what are the causes for polyhydramnios
maternal: DM
foetal: anomaly, monochorionic twin pregnancy, hydrops fetalis, viral infection
idiopathic
Symptoms + signs of polyhydramnios in the mother
Abdominal discomfort pre labour rupture of membranes pre term labour cord prolapse = obstetric emergency large for dates malpresentation tense shiny abdomen inability to feel foetal parts
Investigations for polyhydramnios
OGTT to exclude DM
USS - anomalies, multiple pregnancies
serology
Ab screen
Management of polyhydramnios
explain and discuss
surveillance
IOL by 40 weeks
Define multiple pregnancy
presence of more than 1 foetus in the uterus
twins, triplets etc
Risk factors for multiple pregnancy
Assisted conception (less so now) Ethnicity - African FH increased maternal age increased parity tall>short
How do monozygotic twins arise
splitting of single fertilised egg
How do dizygotic twins arise
from fertilisation of 2 separate ova by 2 separate sperm