Ultraschall in Med 2020; 41(01): 80-81
DOI: 10.1055/a-0770-2850
Letter to the Editor
© Georg Thieme Verlag KG Stuttgart · New York

True Cord Knot Means True Fetal Risk – Comment on the Title Image of Ultraschall in Med 2018; 39(02):127–128

Cathrine Ebbing
1  Department of Obstetrics and Gynecology, Haukeland Universitetssjukehus, Bergen, Norway
,
Jörg Kessler
1  Department of Obstetrics and Gynecology, Haukeland Universitetssjukehus, Bergen, Norway
,
Svein Rasmussen
2  Department of Clinical Science, University of Bergen, Norway
› Author Affiliations
Further Information

Publication History

Publication Date:
12 April 2019 (online)

Dear Editor,

Thank you for the title page with comments by Merz and Pashaj [1] showing an ultrasound image of a true umbilical cord knot in a single umbilical artery cord. We would like to add some comments and new findings from our nationwide population-based study on the umbilical cord including cord knots [2] and have utilized our dataset to explore the occurrence and risk in cases with the combination of a single umbilical artery and a knot not previously published. We found that in our population of more than 900 000 singleton births, the occurrence of a combination of a cord knot and a single umbilical artery is a very rare condition (0.014 %). There was an increased risk of perinatal death in these cases, but the confidence intervals were wide, reflecting the rarity of the condition. For the total group of single umbilical artery with knot, the odds ratio for perinatal death was 5.26 (95 % CI 2.15–12.85). Since the condition shown on the title page (Ultraschall in Med 2018; 39(02)) is very rare, we are curious to learn how this pregnancy was handled and if the outcome was good.