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Values of T/QRS ratios measured during normal and post-term pregnancies

  • Tomasz Fuchs EMAIL logo
Veröffentlicht/Copyright: 21. Dezember 2013

Abstract

Aim: To evaluate values and variability of T/QRS ratios between 28 and 42 weeks’ gestation in term and post-term pregnancies using non-invasive methods with electrodes placed over the maternal abdomen.

Methods: Fetal electrocardiograms were recorded from 657 women with singleton pregnancies. Recorded signals were analyzed by KOMPOREL software from ITAM (Zabrze, Poland) and the T/QRS ratios were automatically calculated. The analyses were performed in subgroups according to gestational age. The T/QRS ratio variables were calculated; one-way analysis of variance (ANOVA test) and linear regression were carried out.

Results: The T/QRS ratio was successfully measured in 95.4% (n=627) of patients during 30 min recordings. Values of T/QRS ratio variables changed during pregnancy. The mean T/QRS ratio ranged between 0.134 in the 41st gestational week and 0.178 in the 35th gestational week. Mean minimal and maximum values of the T/QRS ratio ranged between 0.02 and 0.29 [x=0.09; standard deviation (SD)=0.05] and 0.08 and 0.5 (x=0.27; SD=0.1), respectively. The highest values occurred in pre-term and post-term pregnancies.

Conclusions: Measurement of the T/QRS ratio is one of the techniques used for non-invasive fetal distress assessment that can be used in antepartum fetal monitoring. Values of T/QRS ratio variables changed during pregnancy from higher in pre-term pregnancies, lower in the peripartum period and rose again in post-term pregnancies. The study provides more insight into the values of T/QRS ratios during pregnancy; however, additional research is required.


Corresponding author: Tomasz Fuchs, MD, PhD, Department of Gynecology and Obstetrics, Wroclaw Medical University, ul. Borowska 213, 50-556 Wroclaw, Poland, Tel.: +48501739838, E-mail:

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

Received: 2013-7-23
Accepted: 2013-10-21
Published Online: 2013-12-21
Published in Print: 2014-5-1

©2014 by Walter de Gruyter Berlin Boston

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