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The umbilical pump: a contributor to twin-twin transfusion
1Phoenix Perinatal Associates, Good Samaritan Regional Medical Center, Arizona, USA.
Obstetrics and Gynecology
|May 1, 1997
Summary
Umbilical vascular coiling may act as a pump. Higher coiling in recipient twins suggests a role in twin-twin transfusion syndrome development.
Area of Science:
- Perinatology
- Fetal Medicine
- Reproductive Biology
Background:
- Umbilical vascular coiling is hypothesized to facilitate placental venous return.
- The umbilical coiling index (UCI) quantifies vascular coiling density.
Observation:
- A prospective study evaluated three twin gestations with twin-twin transfusion syndrome.
- Umbilical cords and birth weights of donor and recipient twins were analyzed.
- UCI was calculated by dividing the number of vascular coils by cord length (cm).
Findings:
- Recipient twins were significantly larger than donor twins.
- Recipient twins exhibited an umbilical coiling index at least double that of their donor counterparts.
- Differential umbilical vascular coiling densities were observed between monochorionic twins.
Implications:
- Variations in umbilical vascular coiling may contribute to the development of twin-twin transfusion syndrome.
- Further research into the biomechanical role of umbilical coiling is warranted.
- This finding may inform future diagnostic or therapeutic strategies for high-risk twin pregnancies.