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

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.

journal_name

J Perinat Med

authors

Fuchs T

doi

10.1515/jpm-2013-0181

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

349-57

issue

3

eissn

0300-5577

issn

1619-3997

pii

/j/jpme-ahead-of-print/jpm-2013-0181/jpm-2013-0181

journal_volume

42

pub_type

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