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Correlation of intrapartum translabial ultrasound parameters with computed tomographic 3D reconstruction of the female pelvis

  • Robert Armbrust EMAIL logo , Wolfgang Henrich , Larry Hinkson , Christian Grieser and Jan-Peter Siedentopf
Published/Copyright: March 16, 2016

Abstract

Aims: Intrapartum translabial ultrasound [ITU] can be an objective, reproducible and more reliable method than digital vaginal examination when evaluating fetal head position and station in prolonged second stage of labor. However, two-dimensional (2D) ultrasound is not sufficient to demonstrate the ischial spines and other important “landmarks” of the female pelvis. Therefore, the purpose of this study was to evaluate the distance of the interspinous plane as a parallel line to the infrapubic line in 2D ITU with the help of 3D computed tomography and digital reconstruction.

Results: Mean distance between the infrapubic plane and the tip of the ischiadic spine was 32.35 (±4.46) mm. The mean height was 166 (±7) cm; the mean weight was 67.5 (±18.4) kg. Body height and the measured distance were significantly correlated (P=0.025; correlation coefficient of 0.5), whereas body weight was not (P=0.37; correlation coefficient of –0.214).

Conclusions: With the present results, clinicians were enabled to transfer the reproducible measurements of the “head station” by ITU to the widespread but observer-depending vaginal examination. Furthermore, ITU can be verified as an objective method in comparison to subjective palpation with the ability to optimize the evaluation of the head station according to bony structures as landmarks in a standardized application.


Corresponding author: Dr. Robert Armbrust, Department of Obstetrics, Charité University Hospital Berlin, Augustenburger Platz 1, 13353 Berlin, Germany, Tel.: +49 [0]30 450 664356

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  1. The authors stated that there are no conflicts of interest regarding the publication of this article.

Received: 2015-11-22
Accepted: 2016-1-25
Published Online: 2016-3-16
Published in Print: 2016-7-1

©2016 by De Gruyter

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