5 Flashcards
Lamba sign indicates:
DCDA
Acardiac twin:
an abnormally developed twin that has no upper body and heart. Deemed the parasitic twin
When do we see a “stuck” twin? What is it?
In cases of twin to twin transfusion syndrome, when one is suffering from oligohydramnios and is closely adhered to the uterine wall
Twin embolization syndrome:
when vascular products travel from a demised twin to the suriving twin by means of a common vascular channel within the shared placenta
Which develops first, the chorion or the amnion?
Chorion
MCDA twins split in how many days?
4-8
Can DCDA twins be identical?
Yes, the zygote splits before day 4
The presence of 1 yolk sac and two fetuses indicates:
MCMA
In TTTS, the donor twin experiences what? What does the recipient twin experience?
Donor- IUGR, oligohydramnios and anemia
Recipient- hydrops, polydramnios and CHF
What’s a treatment for TTTS?
therapeutic amniocentesis and endoscopic-guided laser photocoagulation
What’s the growth difference for TTTS?
~20%
The pump twin has a higher chance of?
perinatal mortality (50-55%), secondary to polyhydramnios and prematurity
If the fetus dies in the first trimester, but is maintained throughout pregnancy, this is referred to as:
papyraceus
What happens when one twin dies in DCDA? MCDA?
DCDA- other twin is not affected
MCDA/MCMA- other twin dies
What is twin embolization syndrome?
When one twin passes, the vascular products of the demised twin travel to the surviving twin by the common vascular passages
The CNS and kidneys are usually affected with the surviving twin. Can also have hydrocephalus and porencephaly
