Obstetric and fetal short- and long-term outcomes of delayed-interval delivery in multiple pregnancies

Multiple pregnancies are at higher risk of preterm birth. However, both children do not necessarily have to be born and exposed to the morbidity of prematurity. One option is a delayed-interval delivery with reduction of morbidity and mortality for the second twin. The present case series demonstrates the feasibility and safety of this procedure including the long-term outcome of the surviving children compared to the overall outcome of premature born children at the same perinatal center.

Retrospective evaluation of all cases of delayed-interval deliveries in multiple pregnancies from 2003 to 2020 at the Women's and Children's Hospital of the University Hospital Ulm.

In 17 cases, the delivery of the second twin could be delayed, on average by 36 days. Pregnancies with delivery of the first twin before 22 weeks of gestation had a longer prolongation than pregnancies with delivery of the first twin after 22 weeks (53 vs. 22 days). If a cerclage was placed after the delivery of the first twin a longer prolongation interval could be achieved (45 vs. 19 days). No severe maternal morbidity occurred, and the short- and long-term outcome of the second twin did not differ from age-matched controls.

In multiple pregnancies with extremely preterm birth of the first twin, delivery of the second twin can in some cases be successfully postponed without serious maternal morbidity or additional fetal complications. Delivery of the first twin before 22 weeks of gestation and placement of a cerclage is associated with a longer prolongation interval.