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Flashcards in Twin Gestation Deck (16):
1

how is chorionicty determined? when?

via ultrasound during the first or early second trimester

2

t or f: multiple gestation pregnancy has a high incidence of preterm labor

true

3

management of antenatal care for a mother of twins should include what two tests/procedures?

ultrasound to determine chorionicity and serial ultrasounds to check for fetal growth restriction/discrepancy

4

how are dizygotic twins formed?

when two separate ova are fertilized by two separate sperm

5

how are monozygotic twins formed?

when one ovum is fertilized by one sperm and subsequently splits

6

how are the chorionicity and amnionicity of monozygotic twins determined?

by the timing of cell division

7

what is the time frame of cell division associated with dichorionic, diamniotic twins?

division between days 0 to 3

8

what is the time frame of cell division associated with monochorionic, diamniontic twins?

division between days 4 to 8

9

when does cell division occur in order to produce conjoined twins?

after 13 days

10

t or f: monochorionic twins have more complications than dichorionic twins

true

11

t or f: there is no increased risk for both structural and congenital anomalies with twin gestations

FALSE

12

what are some ddx for a size/date discrepancy in pregnancy? @ least 5

twins, distended bladder, fetal macrosomia, hydramnios, maternal obesity, uncertain LMP, molar pregnancy, adnexal mass

13

how often should monochorionic twins undergo US examination to examine fetal growth? dichorionic?

every 4 weeks; 6-8 weeks

14

what is twin to twin transfusion syndrome, and what kind of twins are most at risk?

condition in which blood/intravascular volume is shunted from one two to another leading to under-perfusion of one twin and over perfusion of the other (donor to recipient); monochorionic

15

what is the cause of TTTS?

unbalanced vascular anastomoses

16

what is the treatment for TTTS?

laser coagulation of the anastomoses