Variation of the maximum velocity along the umbilical vein supports the Reynolds pulsometer modela

[en] Objective: To challenge, with a modern sonographic approach and a numerical model, the Reynolds's concept which suggests that the vascular structure of the umbilical cord could act as a pulsometer facilitating the venous return to the foetus. Method: Forty-five patients between 20 and 28 weeks of gestation were included in the study. The blood maximum velocity in the umbilical vein, measured at both foetal and placental ends, was assessed. Several sonographic parameters of the cord, including the diameter of the umbilical vein at both extremities, cord cross-sectional area and Wharton's jelly section surface were measured. We compare our data with those of a numerical model. Results: A difference in maximum velocity between the two extremities of the umbilical vein (ΔUV Vmax) was noted. The maximum velocity was significantly higher at the foetal umbilical end (14.12 +/-3.18 cm/s) than at the placental end (11.93 +/-2.55 cm/s; p < 0.0001). The mean difference is 2.2 +/- 2.3 cm/s. No difference in the umbilical vein diameter was measured at both cord ends (umbilical 4.85 +/-0.9 mm, placental 4.86 +/-0.87 mm, p < 0.0001). There is no significant relationship between ΔUV Vmax and the cord cross-sectional area or Wharton's jelly index. Conclusion: Modifications of the spatial velocity profile together with the pulsometer model could explain the maximum velocity changes that is measured in the umbilical vein along the cord. This numerical model consolidates the sonographic observations. © 2019

Disciplines :

Reproductive medicine (gynecology, andrology, obstetrics)

Author, co-author :

CAPELLE, Xavier ; Centre Hospitalier Universitaire de Liège - CHU > Département de gynécologie-obstétrique > Secteur obstétrique

Schaaps, Jean-Pierre ; Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Département des sciences biomédicales et précliniques

BAVI DIDO, Jean-Vincent ; Centre Hospitalier Universitaire de Liège - CHU > Département de gynécologie-obstétrique > Service de gynécologie-obstétrique

DAUBY, Morgane ; Centre Hospitalier Universitaire de Liège - CHU > Département de gynécologie-obstétrique > Service de gynécologie-obstétrique (CHR)

Desaive, Thomas ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles

VAN LINTHOUT, Christine ; Centre Hospitalier Universitaire de Liège - CHU > Département de gynécologie-obstétrique > Secteur obstétrique

SEIDEL, Laurence ; Centre Hospitalier Universitaire de Liège - CHU > Département de gestion des systèmes d'informations (GSI) > Secteur d'appui à la recherche clinique et biostatistique

Kridelka, Frédéric ; Université de Liège - ULiège > Département des sciences cliniques > Gynécologie-Obstétrique

Dauby, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles

Machrafi, Hatim ; Université de Liège - ULiège > In silico medecine-Thermodynamics of Irreversible Processes

Language :

English

Title :

Variation of the maximum velocity along the umbilical vein supports the Reynolds pulsometer modela

Publication date :

2019

Journal title :

Journal of Gynecology Obstetrics and Human Reproduction

eISSN :

2468-7847

Publisher :

Elsevier Masson SAS

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 06 January 2020

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