Clinical Trial Summary
At present, the incidence of monochorionic twins in all pregnancies is around 3-5‰
worldwide.In 2019, the twin Committee of China Maternal and Child Health Association
conducted statistics from 48 medical units all over the country, showing that there were
4,876 cases of monochorionic twins, accounting for 10.2‰ of all pregnancies.In addition to
increased incidence of preterm delivery, miscarriage, and maternal complication, the unique
placental vascular structure of monochorionic twins is associated with complex fetal
complication such as twin-twin transfusion syndrome, selective intraurine growth restriction,
twin anaemia-erythrocytosis sequence, twin reversed arterial perfusion sequence, one of twin
with dysplasia, twins with single amniotic sac and conjunctions are common. At present, there
is no unified standard for the diagnosis and treatment of these complicated twins, and
various treatment methods have a great impact on the pregnancy outcome and fetal
prognosis.Therefore, the standardized management of complex twins benefits diagnosis and
treatment of complex twins and improves fetal prognosis.