LE 3: Twins, Placenta Previa, Abruptio Placenta Flashcards
may result from 2 or more fertilization event OR single fertilization followed by “erroneous” splitting of zygote OR combination of both
Multifetal Gestation
inc. preterm birth compromised neonate survival inc. lifelong disability inc. infant mortality inc. congenital malformation inc. maternal morbidity (Pre-eclampsia, postpartum hemorrhage, periparturm hysterectomy, depression)
Multifetal Birth
virtually quadruplets are
born preterm
inc. rate of twin and higher order of multi-fetal births
infertility therapy
“Fraternal Twins”
Dizygotic Twins
maturation and fertilization of 2 ova in 1 ovulation
Dizygotic Twins
“Identical Twins”
Monozygotic twins
same genetic heritage, does not equally share protoplasmic material
Monozygotic twins
occurs at 1st 72 hours after fertilization
Diamnionic, Dichorionic twins
2 embryos, 2 amnions, 2 chorions
Diamnionic, Dichorionic twins
occurs at 4th and 8th day after fertilization
Diamnionic, Monochorionic twins
occurs at 8th day after fertilization
Monoamnionic, Monochorionic twins
uterine cavity is obliterated by fusion of decidua capsularis to the decidua parietalis
Superfetation
fertilization of 2 ova w/in the same menstrual cycle but not at the same coitus, nor sperm from same male.
Superfecundation
occurs at 13th day after fertilization
Conjoined twins
after embryonic disk is formed cleavage is incomplete
Conjoined twins
Monochorionic
monoamnionic
conjoined twins
Monochorionic
monoamnionic
Monochorionic
diamnionic
Dichorionic
diamnionic
“Fused placenta”
Dichorionic
diamnionic
“Separated Placenta”
A = Amnion
C = Chorion
Monochorionic diamnionic twin pregnancy
Dichorionic diamnionic twin pregnancy
