True or false umbilical cord knot? Differentiation via 3D/4D color Doppler ultrasound

Merz, Eberhard; Pashaj, S.

doi:10.1055/a-0571-8608

Cited by 15 publications

(23 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Subsequently, three-dimensional ultrasound has enabled precise depiction of a true knot of the umbilical cord ( Figures 5, 6, 7). [67][68][69][70][71][72][73][74][75][76] Notwithstanding the Figure 4 Power Doppler image depicting a true knot of the umbilical cord. Note the "smiley face" features (almost complete circle of umbilical cord [face outline] surrounding "eyes" and "mouth/smile"), representing the en-face presenting two umbilical arteries and umbilical vein, respectively.…”

Section: True Knot(s) Of the Umbilical Cordmentioning

confidence: 99%

“…77 Currently, such sonographic findings in the clear absence of the described characteristic sonographic findings of a true knot in conjunction with application of threedimensional sonography (and visualization of the umbilical cord from a different angle), as detailed by Merz and Pashj, enable clear prenatal sonographic differentiation of these two distinctly different anatomical entities. 74…”

Section: False Knot Of the Umbilical Cordmentioning

confidence: 99%

See 1 more Smart Citation

<p>Current Perspectives of Prenatal Sonographic Diagnosis and Clinical Management Challenges of True Knot of the Umbilical Cord</p>

Sherer

Amoabeng

Dryer

et al. 2020

IJWH

View full text Add to dashboard Cite

Umbilical cord accidents preceding labor are rare. Single and multiple nuchal cords, and true knot(s) of the umbilical cord, are often incidental findings noted at delivery of nonhypoxic non-acidotic newborns without any evidence of subsequent adverse neonatal outcome. In contrast to single nuchal cords, true knots of the umbilical cord, which occur in between 0.04% and 3% of all deliveries, have been associated with a reported 4 to 10 fold increased risk of stillbirth. First reported with real-time ultrasound, current widespread application of color Doppler, power Doppler and three-dimension sonography, has enabled increasingly more accurate prenatal sonographic diagnoses of true knot(s) of the umbilical cord. Reflecting the inability to visualize the entire umbilical cord at prenatal ultrasound assessment, despite detailed second and third-trimester scanning, many occurrences of incidental true knot of the umbilical cord remain undetected and are noted only at delivery. Although prenatal sonographic diagnostic accuracy is increasing, false positive sonographic diagnosis of true knot of the umbilical cord cannot be ruled out with certainty, and must continue to be considered clinically. Notwithstanding the inability to diagnose all true knots, currently there is a clear absence of clinical management guidelines by governing bodies regarding patients in whom prenatal sonographic diagnosis of true knot(s) of the umbilical cord is / are suspected. As a result, in many prenatal ultrasound units, suspected sonographic findings suggestive of or consistent with true knot of the umbilical cord are often disregarded, not documented, and patients are not uniformly informed of this potentially life-threatening condition, which carries an associated considerable risk of stillbirth. This commentary will address current perspectives of prenatal sonographic diagnostic and management challenges associated with true knot(s) of the umbilical cord in singleton pregnancies.

show abstract

Section: True Knot(s) Of the Umbilical Cordmentioning

confidence: 99%

Section: False Knot Of the Umbilical Cordmentioning

confidence: 99%

<p>Current Perspectives of Prenatal Sonographic Diagnosis and Clinical Management Challenges of True Knot of the Umbilical Cord</p>

Sherer

Amoabeng

Dryer

et al. 2020

IJWH

View full text Add to dashboard Cite

show abstract

“…In recent years, software modifications included the addition of a light source, which helped to emphasize the 3D effect of the examined structures (HDlive tool) or to make the color more transparent, highlighting spatial relationships of blood vessel (silhouette tool). Advantages of this new color technique have been discussed in recent articles in this journal, primarily involving the differentiation between a true and a false umbilical cord knot [3] and on the display of the venous system [4 -6].…”

Section: -Dimensionale Darstellung Eines Fetalen Doppelten Aortenbogmentioning

confidence: 99%

“…In den letzten Jahren wurden jedoch neue zusätzliche Applikationen entwickelt, die es erlauben, zum einen eine Lichtquelle zu verwenden, um den 3D-Effekt der untersuchten Struktur besser hervorzuheben, und zum anderen, mit der Silhouette-Funktion die Farbe transparenter zu ma-chen, um hintereinander gelegene Gefäße besser zu sehen. Der Vorteil dieser neuen Farbdarstellung wurde in den jüngsten Artikeln dieser Zeitschrift über die Unterscheidung zwischen einem echten und einem falschen Nabelschnurknoten [3] diskutiert und in mehreren Artikeln über das Venensystem vorgestellt [4 -6].…”

Section: -Dimensionale Darstellung Eines Fetalen Doppelten Aortenbogunclassified

Three-dimensional visualization of a fetal double aortic arch with HDlive color Doppler

Chaoui¹,

Merz

2019

Ultraschall in Med

Self Cite

View full text Add to dashboard Cite

“…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.…”

Section: Dear Editormentioning

confidence: 99%

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

2019

View full text Add to dashboard Cite

True or false umbilical cord knot? Differentiation via 3D/4D color Doppler ultrasound

Cited by 15 publications

References 12 publications

<p>Current Perspectives of Prenatal Sonographic Diagnosis and Clinical Management Challenges of True Knot of the Umbilical Cord</p>

<p>Current Perspectives of Prenatal Sonographic Diagnosis and Clinical Management Challenges of True Knot of the Umbilical Cord</p>

Three-dimensional visualization of a fetal double aortic arch with HDlive color Doppler

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

Contact Info

Product

Resources

About