What is the incidence of Twin-to-Twin Transfusion Syndrome (TTTS) in mono/di twins?

Twin-to-Twin Transfusion Syndrome (TTTS) occurs in pregnancies where there are monochorionic (share the same placenta) and diamniotic (have separate amniotic sacs) twins. The condition arises due to unequal blood flow between the two fetuses via placental anastomoses, which results in one twin receiving more blood supply (the recipient) while the other twin (the donor) may become undernourished.

The incidence of TTTS in monochorionic diamniotic twin pregnancies is approximately 10%. This statistic is important in the management of these pregnancies, as the presence of TTTS can lead to significant complications for both fetuses and can impact decisions regarding monitoring and treatment.

Understanding the incidence of TTTS helps clinicians identify at-risk pregnancies and implement appropriate surveillance and intervention strategies to improve outcomes for the affected twins.