Hemodynamic evaluation in pregnancy: limitations of impedance cardiography

Physiological Measurement
Manfred G MoertlHelmut Lackner

Abstract

Impedance cardiography (ICG) has been proposed to estimate the stroke volume (SV) and cardiac output (CO) in various medical indications. The aim of this study was to explore the reliability of ICG during pregnancy with respect to SV and CO measurements. Blood pressure, heart rate and thoracic impedance were monitored during the course of pregnancy and related ICG patterns analyzed. We determined thoracic impedance (Z(0)), left ventricular ejection time (LVET) and the maximum value of the first derivative of the impedance waveform (dZ/dt)(max) beat-to-beat. The two main components of non-invasive SV estimation, LVET and (dZ/dt)(max), decreased in week 35 relative to week 12 by 7.6% ± 4.8% and by 36.0% ± 14.0%, respectively, based on a decrease in R-R interval of 9.9% ± 9.7%, whereas changes in Z(0) did not play a significant role. Furthermore, the decrease of (dZ/dt)(max) was greater in the third compared to the second trimester of pregnancy. Taking into account an 18.2% ± 6.8% body weight increase, the calculated SV decreased in week 35 relative to week 12 by 19.2% ± 14.3%. The normalized term ((dZ/dt)(max))/Z(0) explained 85-94% of the variance of SV change after week 20. These results were confirmed for fixed R-R interval at...Continue Reading

References

Oct 1, 1977·The American Journal of Cardiology·S RublerE R Pinto
Dec 1, 1992·British Heart Journal·S Hunter, S C Robson
Oct 1, 1991·The American Review of Respiratory Disease·G ContrerasC Lisboa
Dec 1, 1989·American Journal of Obstetrics and Gynecology·S L ClarkJ Phelan
Dec 1, 1988·American Journal of Obstetrics and Gynecology·J F ClappJ Hiser
May 1, 1995·Heart & Lung : the Journal of Critical Care·L JensenK K Teo
Feb 1, 1995·IEEE Transactions on Bio-medical Engineering·L Wang, R Patterson
Dec 1, 1994·Obstetrical & Gynecological Survey·J J Duvekot, L L Peeters
Feb 1, 1996·Obstetrics and Gynecology·A C van OppenH W Bruinse
Jun 1, 1997·Acta Anaesthesiologica Scandinavica·B J van der MeerP M de Vries
Jun 5, 2003·Academic Emergency Medicine : Official Journal of the Society for Academic Emergency Medicine·Richard L SummersThomas G Coleman
Jun 11, 2003·Chest·Joseph M Van De WaterMartin L Dalton
Jul 2, 2004·Obstetrics and Gynecology·Dushyant K DesaiD P Naidoo
Feb 18, 2006·Computers in Biology and Medicine·J FortinF Skrabal
Apr 19, 2007·BJOG : an International Journal of Obstetrics and Gynaecology·M N M VolmanJ I P de Vries
Sep 2, 2008·Best Practice & Research. Clinical Obstetrics & Gynaecology·Andrew Carlin, Zarko Alfirevic

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Citations

Jul 21, 2015·Clinical and Experimental Pharmacology & Physiology·Anneleen S StaelensWilfried Gyselaers
Aug 25, 2015·BMC Pregnancy and Childbirth·Rhiannon Emma CarpenterMichael J Lewis
Apr 18, 2015·BMC Pregnancy and Childbirth·Jordan Pr McIntyreUNKNOWN Maternal Sleep in Pregnancy Study Group
Jan 10, 2014·Obstetrics and Gynecology·Rachael MorrisJames N Martin
Oct 6, 2018·Acta Obstetricia Et Gynecologica Scandinavica·Rossana OrabonaGanesh Acharya
Feb 10, 2019·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·R C BijlUNKNOWN International Working Group on Maternal Hemodynamics
Dec 19, 2013·Physiological Measurement·Lindsay A D'SilvaMichael J Lewis
Aug 26, 2017·Hypertension in Pregnancy : Official Journal of the International Society for the Study of Hypertension in Pregnancy·Miha LucovnikManfred Georg Moertl
Feb 11, 2021·Journal of Perinatal Medicine·Romina-Marina SimaLiana Pleș

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