![]() Non-survivors manifest myocardial dysfunction. The embryonic human heart is dependent on the atrial contraction for ventricular filling throughout the period of cardiac development. After 8 weeks of gestation, the fetal heart is morphologically mature but has not yet achieved effective myocardial compliance. ICT% decreased from 18.6 +/- 4.4% of the cardiac cycle at 8 weeks to 12.6 +/- 4.4% at 9 weeks (p < 0.0008) (after heart development period).ĭoppler examination of the fetal cardiac function is possible after 5 weeks of gestation. The rate, duration, and origin of the rhythm and. A fetal heart rate is considered abnormal if the heart rate is beyond the normal ranges or the rhythm is irregular. The normal fetal heart rate ranges between 110 and 160 beats per minute. In survivors, IRT% decreased between 7 and 8 weeks, from 32.9 +/- 10.7% to 20.8 +/- 5.7% (p < 0.0001). This article reviews important features for improving the diagnosis and management of fetal arrhythmias. ![]() Eight pregnancies (9%) miscarried between 6 and 12 weeks of gestation and the heart exams were characterized by increased IRT% compared with the survivors. The inflow waveform was monophasic (atrial contraction) in all cases from 6 to 9 weeks. Mean heart diameter at 6 weeks was 1.28 +/- 0.26 mm and mean fetal heart rate was 117 +/- 6 bpm compared to 3.88 +/- 0.54 mm and 171 +/- 6 bpm at 10 weeks. Heart diameter and the fetal heart rate showed a positive correlation with increasing gestational age: R = 0.80 (p < 0.000001), R = 0.76 (p < 0.000001), respectively. Ninety-one percent of studies were successful. The proportion of the cardiac cycle of isovolumetric relaxation time (IRT%) and isovolumetric contraction time (ICT%) as well as Tei index were calculated. Heart diameter, heart rate, and inflow and outflow waveforms with valve signals were documented. Comper Smart Doppler Fetal Monitor is a mother’s trusty companion and a baby’s guardian by accurately detecting the fetal heart rate.It works with Comper App. To describe normal fetal cardiac and hemodynamic development in normal early first trimester pregnancies.Įighty-eight women with singleton, uncomplicated pregnancies were prospectively studied with transvaginal ultrasound, pulsed and color Doppler.
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