Persistent occiput posterior position and stress distribution in levator ani muscle during vaginal delivery computed by a finite element model

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11120%2F20%3A43918437" target="_blank" >RIV/00216208:11120/20:43918437 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11140/20:10395722 RIV/49777513:23520/20:43959628 RIV/49777513:23640/20:43959628 RIV/00669806:_____/20:10395722 RIV/00023698:_____/20:N0000003

Výsledek na webu

<a href="https://doi.org/10.1007/s00192-019-03997-8" target="_blank" >https://doi.org/10.1007/s00192-019-03997-8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00192-019-03997-8" target="_blank" >10.1007/s00192-019-03997-8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Persistent occiput posterior position and stress distribution in levator ani muscle during vaginal delivery computed by a finite element model

Popis výsledku v původním jazyce

Introduction and hypothesis: Objective of this study was to develop an MRI-based finite element model and simulate a childbirth considering the fetal head position in a persistent occiput posterior position. Methods: The model involves the pelvis, fetal head and soft tissues including the levator ani and obturator muscles simulated by the hyperelastic nonlinear Ogden material model. The uniaxial test was measured using pig samples of the levator to determine the material constants. Vaginal deliveries considering two positions of the fetal head were simulated: persistent occiput posterior position and uncomplicated occiput anterior position. The von Mises stress distribution was analyzed. Results: The material constants of the hyperelastic Ogden model were measured for the samples of pig levator ani. The mean values of Ogden parameters were calculated as: μ1 = 8.2 +- 8.9 GPa; μ2 = 21.6 +- 17.3 GPa; α1 = 0.1803 +- 0.1299; α2 = 15.112 +- 3.1704. The results show the significant increase of the von Mises stress in the levator muscle for the case of a persistent occiput posterior position. For the optimal head position, the maximum stress was found in the anteromedial levator portion at station +8 (mean: 44.53 MPa). For the persistent occiput posterior position, the maximum was detected in the distal posteromedial levator portion at station +6 (mean: 120.28 MPa). Conclusions: The fetal head position during vaginal delivery significantly affects the stress distribution in the levator muscle. Considering the persistent occiput posterior position, the stress increases evenly 3.6 times compared with the optimal head position.

Název v anglickém jazyce

Persistent occiput posterior position and stress distribution in levator ani muscle during vaginal delivery computed by a finite element model

Popis výsledku anglicky

Introduction and hypothesis: Objective of this study was to develop an MRI-based finite element model and simulate a childbirth considering the fetal head position in a persistent occiput posterior position. Methods: The model involves the pelvis, fetal head and soft tissues including the levator ani and obturator muscles simulated by the hyperelastic nonlinear Ogden material model. The uniaxial test was measured using pig samples of the levator to determine the material constants. Vaginal deliveries considering two positions of the fetal head were simulated: persistent occiput posterior position and uncomplicated occiput anterior position. The von Mises stress distribution was analyzed. Results: The material constants of the hyperelastic Ogden model were measured for the samples of pig levator ani. The mean values of Ogden parameters were calculated as: μ1 = 8.2 +- 8.9 GPa; μ2 = 21.6 +- 17.3 GPa; α1 = 0.1803 +- 0.1299; α2 = 15.112 +- 3.1704. The results show the significant increase of the von Mises stress in the levator muscle for the case of a persistent occiput posterior position. For the optimal head position, the maximum stress was found in the anteromedial levator portion at station +8 (mean: 44.53 MPa). For the persistent occiput posterior position, the maximum was detected in the distal posteromedial levator portion at station +6 (mean: 120.28 MPa). Conclusions: The fetal head position during vaginal delivery significantly affects the stress distribution in the levator muscle. Considering the persistent occiput posterior position, the stress increases evenly 3.6 times compared with the optimal head position.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

30214 - Obstetrics and gynaecology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Urogynecology Journal

ISSN

0937-3462

e-ISSN

—

Svazek periodika

31

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

1315-1324

Kód UT WoS článku

000544356200005

EID výsledku v databázi Scopus

2-s2.0-85067790578