Flashcards in High-Risk Pregnancy Part 2 Deck (61)
Which is more common- monozygotic or dizygotic twins?
All dizygotic twins have what chorionicity/amniocity?
Monozygotic twins where the embryo splits at days 0-3 after fertilisation (morula stage) will have what chorionicity/amniocity?
Monozygotic twins where the embryo splits at days 4-7 after fertilisation (blastocyst stage) will have what chorionicity/amniocity?
Monozygotic twins where the embryo splits at days 8-14 after fertilisation (implanted blastocyst stage) will have what chorionicity/amniocity?
Monozygotic twins where the embryo splits at days 15+ after fertilisation (formed embryonic disc stage) will have what chorionicity/amniocity?
Other than ethnic origin, what are some risk factors for having DCDA twins?
Family history, increasing maternal age, fertility treatment
Individuals of what ethnic origin are at increased risk of having DCDA twins?
The chorionicity of a twin pregnancy is determined by what investigation, ideally before what gestation?
Ultrasound, ideally before 14 weeks
The presence of the lambda or twin peak sign on ultrasound indicates which chorionicity of twin pregnacy?
The presence of the T sign on ultrasound indicated which chorionicity of pregnancy?
Which chorionicity of twins are at an increased risk of pregnancy complications?
When does twin anaemia-polycythaemia sequence typically occur?
After foetoscopic laser ablation for twin-twin transfusion syndrome
What happens to the AFP in a multiple pregnancy?
How often are monochorionic twin pregnancies scanned after 24 weeks?
Every 2 weeks
How often are dichorionic twin pregnancies scanned after 24 weeks?
Every 4 weeks
In twin pregnancies, serial ultrasound growth scanning is used from what gestation?
A size discordance of greater than what between twins or triplets is clinically significant?
Twin-twin transfusion syndrome only occurs in which type of twin pregnancy?
In MCMA twin pregnancies, ultrasound scans are carried out every 2 weeks from what gestation?
How is twin-twin transfusion syndrome treated in early pregnancy, i.e. < 26 weeks?
Foetoscopic laser ablation
How is twin-twin transfusion syndrome treated in late pregnancy, i.e. > 26 weeks?
Amnioreduction or septostomy
How often do monochorionic twin pregnancies have antenatal appointments?
Every 2 weeks
How often do dichorionic twin pregnancies have antenatal appointments?
Every 4 weeks
What supplements should be given to women with multiple pregnancies?
Iron, folic acid and aspirin
In an MCDA twin pregnancy, delivery is by induction or C-section at what gestation?
In a DCDA twin pregnancy, delivery is by induction or C-section at what gestation?
When is C-section recommended to mothers of twin pregnancies?
When the first twin is in the breech or transverse position
When and how should MCMA twins be delivered?
32 weeks by C-section