What percent of twins are monozygotic?
33% or 1/3
Best test to ID twins and assess zygosity?
Types of twins
Monozygotic - identical, one egg splits
Dizygotic - fraternal, two eggs
What is twin-twin transfusion syndrome?
One twin gets more of blood than other one.
What factors increase risk of dizygotic twins? (there are none for monozygotic!)
Ethnicity, older age, positive fam hx, use of ovulation induction
Most common antepartum complications?
Cords tangled if monochorionic
preterm labor (1/3)
twin-twin transfusion syndrome
Most common intrapartum and post partum complications?
Abnormal Fetal Heart Rate
Uterina atony leading to postpartum hemorrhage
What tests are of most use in IDing complications?
U/S and Family Hx
What factors are considered in determining delivery method of twin?
Presentation and Labor progress/problems
What is principal cause of higher order multiples?
Improper gonadotrophins during assisted reproductive techniques