multiple gestations Flashcards
what are dizygotic twins
2 separate fertilizations that occupy the same uterus.
by definition what are dizygotic twins
dichorionic and diamniotic
so, di, di, di.
what is the easiest way to tell dizygotic?
different sexes must be dizygotic
what are the risks for dizygotic
preterm labor, post-partem hemorrhage, increase risk of section 50%
how many placentas do identical twins have?
two placentas. by definition they are from a single fertilization event and are always the same gender and are monozygotic, dichorionic, and diamniotic.
what are the risks for identical twins
same as fraternal
if one placenta, then what to look at next?
this means you are looking at monozygotic, dichorionic twins and need to assess the septum. thus, if there is one septum then diamniotic, and if there is no septum then monoamniotic.
what are twins with a septum called
monozygotic, monochorionic, diamniotic twins. they are from one fertilization (are the same gender), share a placenta, but do not share a amniotic sac.
what are monozygotic, monochorionic, diamniotic twins at risk for?
twin-twin transfusion.
which twin in the twin-twin transfusion syndrome does worse?
the larger one because of bilirubin build up.
If there is no septum detected what are the twins called
monozygotic, monochorionic, monoamniotic twins. they share everything. this arose from a later split event (before 9-12 days non-conjoined), (after 9-12 days, conjoined)
what are monozygotic, monochorionic, monoamniotic twins at risk for?
cord entanglement, conjoined twining
can monozygotic, monochorionic, diamniotic twins be conjoined?
NO. only mono, mono, mono
when do identical twins split? and what do they look like on US
early split event. look just like DI, DI, DI. impossible to tell without genetics
when do mono, mono, di split?
fairly early split, 4-8 cell stage. they share the same placenta but are in the same sac.
