Abstract
Purpose
To construct biventricular reference ranges for isovolumic time intervals (isovolumic contraction time, ICT; isovolumic relaxation time, IRT) and ejection time (ET) for colour tissue Doppler imaging (cTDI) between 15 and 37 weeks’ in healthy fetuses.
Methods
This was a prospective multicentre cross-sectional study involving 160 singleton pregnancies between 15 and 37 weeks of gestation, using cTDI. ICT, ET, IRT and myocardial performance index (MPI) were analysed offline using a small region of interest (ROI) within the basal part of the right and left ventricular wall immediately distal to the annulus. Regression analysis was used to determine gestational age-adjusted reference ranges and to construct nomograms for cTDI parameters.
Results
Right and left ventricular ICT (p = 0.004 and p < 0.001) and ET (p = 0.011 and p = 0.050) increased, whereas IRT (p = 0.862 and p = 0.067) and MPI (p = 0.476 and p = 0.777) remained constant with gestational age.
Conclusions
This is the first study to evaluate fetal isovolumic time intervals in the second and third trimesters of gestation using cTDI. Normal data for fetal isovolumic time intervals and biventricular MPI by colour tissue Doppler imaging are provided. The reference ranges may be useful in research or clinical studies and can be used in fetuses with compromised cardiac function.
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Acknowledgments
This study was funded by a grant from the German Society of Ultrasound in Medicine (Deutsche Gesellschaft für Ultraschall in der Medizin, DEGUM). Technical support was provided by Toshiba Medical Systems Corporation, Otawara-Shi, Tochigi, Japan.
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The authors AW, JS, CE, RA, UG, RF and FB declare that they have no conflict of interest. The co-authors AD and WG worked for Toshiba Medical Systems Corporation, Otawara-Shi, Tochigi, Japan and provided technical support.
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All procedures performed in our study were in accordance with the ethical standards of the institutional (study protocol 253/11) and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Written Informed consent was obtained from all individual participants included in the study.
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On behalf of the Fetal Cardiac Imaging Research Group Germany.
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Willruth, A., Steinhard, J., Enzensberger, C. et al. Fetal colour tissue Doppler imaging (cTDI): biventricular reference ranges for the time segments of the cardiac cycle in second and third trimesters of gestation. Arch Gynecol Obstet 294, 917–924 (2016). https://doi.org/10.1007/s00404-016-4076-z
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DOI: https://doi.org/10.1007/s00404-016-4076-z