Flashcards in Large for Dates Deck (39)
What are the possible causes for a 'LFD' pregnancy?
What is polyhydramnios?
Excess amniotic fluid
What are some causes of polyhydramnios?
Monochorionic twin pregnancy
Hydrops fetalis – Rh isoimmunisation, infection (erythrovirus B19)
What are some symptoms/complications of polyhydramnios?
How is polyhydramnios diagnosed?
What are the incidences of spontaneous multiple pregnancies?
What is zygosity?
The number of eggs fertilised to produce twins
What is chorionicity?
The membrane pattern of the twins
What types of twins are at a higher risk of pregnancy complications?
What chorionicities can occur in monozygotic twins?
Monochorionic diamnotic ~2/3
Dichorionic diamnotic ~1/3
Monochorionic monoamniotic ~1%
What chorionicity occurs in dizygotic twins?
How can the chroionicity be discovered before birth?
US- shape of membrane and thickness of membrane: twin peak at 12 weeks
When is multiple pregnancy usually diagnosed?
12 weeks at US
What clinical features can indicate multiple pregnancy?
Exaggerated pregnancy symptoms e.g. excessive sickness
Large for dates uterus
Feeling more than two fetal poles
Why does a multiple pregnancy have a much higher perinatal mortality?
Pre term labour
Twin to twin transfusion
How is a multiple pregnancy managed?
More frequent antenatal visits
Detailed anomaly scan at 18wks
Regular scans from 28wks for growth
Routine iron supplementation
Warning to mother re risk and signs of pre term labour
How is a multiple pregnancy delivered?
Twins- if twin one cephalic aim for SVD, possibly with epidural. Much greater risk for C-section (50%)
Triplets or more- C section
What is the definition of GDM?
Carbohydrate intolerance resulting in hyperglycaemia of variable severity with onset or first recognition during pregnancy
What is the incidence and ethnic variation of GDM?
South Asia, Middle Eastern
What is the pathophysiology of GDM?
Placental hormones lead to relative insulin deficiency or resistance
Aberrant fuel mixture> glucose, aa's and lipids
Leads to hyperinsulinaemia
What are the consequences of GDM?
Overgrowth of insulin sensitive tissues and macrosomia
Hypoxaemic state in utero
Short term metabolic complications
Fetal metabolic reprogramming leading to increase long term risk of obesity, insulin resistance and diabetes
What screening is carried out for GDM?
Women screened for GTT based on RF's or random blood glucose at booking and 28wks
How is GDM diagnosed?
Based on GTT at 28wks
What are the risk factors for GDM?
FHx of DM
Previous big baby
Previous unexplained still birth
What complications occur in pregnancy due to pre-existing DM?
Intra uterine death
What complications in pregnancy are common to pre-existing and GDM?
What do all complications in pregnancy due to diabetes relate to?
What should target levels of glucose be in pregnancy?
1hr post prandial <7.8mmol/l
What should initially be done in prevention of hyperglycaemia in pregnancy?