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Discordance of umbilical coiling index between recipients and donors in twin-twin transfusion syndrome.

Abstract：

INTRODUCTION:To compare the intertwin umbilical cord coiling in twin-twin transfusion syndrome (TTTS) before fetoscopic laser treatment and to correlate these with Doppler findings in both twins. METHODS:We performed a prospective study using three-dimensional (3D) ultrasound with color Doppler imaging of the umbilical cord in TTTS. Coiling index was measured as a reciprocal value of one complete vascular coil. Ultrasound hypocoiling was thus defined as < 0.2 coils/cm and hypercoiling as > 0.6 coils/cm, respectively. Umbilical artery pulsatility index (PI) and peak systolic velocity, middle cerebral artery peak systolic velocity and ductus venosus PI of flow-velocity waveformes of both twins were measured. RESULTS:We included 65 women in the study. The average gestational age was 21.1 ± 2.7 weeks. In 65 recipients and 56 donors coiling index could be quantified. The median (interquartile range) coiling index of recipient twins was significantly higher than of donors, 0.55 (0.41-0.68) vs. 0.26 (0.2-0.5); P < 0.0001. The proportions of abnormal intertwin coiling were significantly (P = 0.0015) different. Out of 65 recipient with coiling indices evaluation, 1 (1.5%) showed hypocoiled and 27 (41.5%) hypercoiled cords. In contrast, 27 donor twins (48.2%) showed hypocoiled and 5 (8.9%) hypercoiled umbilical cords. There were no significant correlations between the fetal Doppler values and coiling indices. DISCUSSION:Evaluation of umbilical cord coiling index using 3D color Doppler in both twins complicated by TTTS is feasible in both, donors and recipients. Coiling indices differ significantly between recipient and donor twins and do not correlate with Doppler findings.

journal_name

Placenta

journal_title

Placenta

authors

Bamberg C,Diemert A,Glosemeyer P,Tavares de Sousa M,Hecher K

doi

10.1016/j.placenta.2019.01.013

subject

Has Abstract

pub_date

2019-01-15 00:00:00

pages

19-22

eissn

0143-4004

issn

1532-3102

pii

S0143-4004(18)31178-0

journal_volume

76

pub_type

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