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Cardiac functional changes in the human fetus in the late first and early second trimesters
Author(s) -
van Splunder I. P.,
Wladimiroff J. W.
Publication year - 1996
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1046/j.1469-0705.1996.07060411.x
Subject(s) - medicine , isovolumic relaxation time , gestational age , cardiac cycle , cardiology , fetus , isovolumetric contraction , cardiac function curve , gestation , pregnancy , doppler echocardiography , obstetrics , diastole , heart failure , blood pressure , biology , genetics
Fetal cardiac function was studied in 52 women at 10–20 weeks of normal gestation using Doppler ultrasonography. According to a cross‐sectional study design, transmitral and ascending aortic flow velocity waveforms were obtained simultaneously, in order to calculate filling and ejection time as well as isovolumic contraction and relaxation time. A statistically significant gestational age‐dependent increase was established for both transmitral and ascending aortic flow velocities. Cardiac cycle length and filling time displayed a statistically significant increase with advancing gestational age, whereas ejection time and isovolumic relaxation time showed a gestational age‐related decrease. No relationship existed between isovolumic contraction time and gestational age. A statistically significant decrease was demonstrated for atria1 contribution to ventricular filling at 10–l4 weeks of gestation, with a constant pattern during the remainder of the study period. No relationship existed between the different components of the cardiac cycle and mitral and aortic flow velocity parameters. This study shows that the late first and early second trimesters of pre,gnancy are characterized by gestational age‐related changes in fetal cardiac function. Copyright © 1996 International Society of Ultrasound in Obstetrics and Gynecology