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BMC Pregnancy and Childbirth
Published in: BMC Pregnancy and Childbirth 1/2015

Open Access 01-12-2015 | Research article

Validation of thoracic impedance cardiography by echocardiography in healthy late pregnancy

Authors: Jordan PR McIntyre, Kevin M Ellyett, Edwin A Mitchell, Gina M Quill, John MD Thompson, Alistair W Stewart, Robert N Doughty, Peter R Stone, the Maternal Sleep in Pregnancy Study Group

Published in: BMC Pregnancy and Childbirth | Issue 1/2015

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Abstract

Background

Assessment of stroke volume (SV) is often necessary in clinical and research settings. The clinically established method for SV assessment in pregnancy is echocardiography, but given its limitations, it is not always an appropriate measurement tool. Thoracic impedance cardiography (ICG) allows continuous, non-invasive SV assessment. However, SV determination relies on assumptions regarding the thoracic shape that may mean the algorithm is not valid in pregnancy. The available data regarding the validity of ICG against an established reference standard using modern SV algorithms are both limited and conflicting. We aimed to test the validity of ICG in a clinically realistic setting in late pregnancy using echocardiography.

Methods

Twenty-nine women in late pregnancy underwent standard echocardiography assessments with simultaneous ICG measurement. Agreement between devices was tested using Bland-Altman analysis.

Results

Bland-Altman analysis of the relationship between ICG and echocardiography demonstrated that the 95% limits of agreement exceeded acceptable or expected ranges. Measures of maternal and fetal anthropometry do not account for the lack of agreement.

Conclusions

Absolute values of SV as determined by ICG are not valid in pregnancy. Further work is required to examine the ability of ICG to assess relative changes in maternal haemodynamics in late pregnancy.
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Metadata
Title
Validation of thoracic impedance cardiography by echocardiography in healthy late pregnancy
Authors
Jordan PR McIntyre
Kevin M Ellyett
Edwin A Mitchell
Gina M Quill
John MD Thompson
Alistair W Stewart
Robert N Doughty
Peter R Stone
the Maternal Sleep in Pregnancy Study Group
Publication date
01-12-2015
Publisher
BioMed Central
Published in
BMC Pregnancy and Childbirth / Issue 1/2015
Electronic ISSN: 1471-2393
DOI
https://doi.org/10.1186/s12884-015-0504-5

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