Department of Obstetrics, Gynecology and Women's Health, John A. Burns School of Medicine, The University of Hawaii, Honolulu, HI 96826, USA.
J Perinatol. 2013 Sep;33(9):675-80. doi: 10.1038/jp.2013.35. Epub 2013 May 16.
The objective of this study was to report thoracic impedance cardiography (ICG) measurements and compare them with echocardiography (echo) measurements throughout pregnancy and in varied maternal positions.
A prospective cohort study involving 28 healthy parturients was performed using ICG and echo at three time points and in two maternal positions. Pearson's correlations, Bland-Altman plots and paired t-tests were used for statistical analysis.
Significant agreements between many but not all ICG and echo contractility, flow and resistance measurements were demonstrated. Differences in stroke volume (SV) due to maternal position were also detected by ICG in the antepartum (AP) period. Significant trends were observed by ICG for cardiac output and thoracic fluid content (TFC; P<0.025) with advancing pregnancy stages.
ICG and echo demonstrate significant correlations in some but not all measurements of cardiac function. ICG has the ability to detect small changes in SV associated with maternal position change. ICG measurements reflected maximal cardiac contractility in the a AP period yet reflected a decrease in contractility and an increase in TFC in the postpartum period.
本研究旨在报告整个孕期及不同产妇体位时的胸腔阻抗心动图（ICG）测量值，并与超声心动图（echo）测量值进行比较。
采用前瞻性队列研究，对 28 例健康产妇在三个时间点和两种产妇体位下进行 ICG 和 echo 检查。采用 Pearson 相关分析、Bland-Altman 图和配对 t 检验进行统计学分析。
ICG 和 echo 的许多但不是所有收缩性、流量和阻力测量值之间存在显著一致性。ICG 在产前（AP）期间也检测到由于产妇体位导致的每搏量（SV）差异。ICG 观察到心输出量和胸腔液体含量（TFC；P<0.025）随妊娠阶段的进展而呈显著趋势。
ICG 和 echo 在一些但不是所有心功能测量值上具有显著相关性。ICG 有能力检测与产妇体位变化相关的 SV 小变化。ICG 测量值反映了 AP 期间最大的心肌收缩力，但反映了收缩力下降和胸腔内液体含量增加。
