OP30.09: Assessment of fetal atrioventicular time intervals by dual Doppler in hepatic vein and descending aorta

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Fetal cardiac time intervals determined by Doppler echocardiography.

One-hundred and eleven Doppler echocardiographic examinations were performed on 88 normal fetuses, ranging from 16 to 41 weeks of gestation. Aortic and pulmonary maximal velocity (MV), acceleration time (AT), ejection time (ET), MV/AT (acceleration velocity: AV) and AT/ET ratio in systole were assessed on each blood flow velocity waveform. Aortic MV and pulmonary MV correlated well with gestati...

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Doppler echocardiographic assessment of fetal descending aortic and umbilical blood flows. Validation studies in fetal lambs.

BACKGROUND Doppler ultrasound has been used to assess abdominal aortic and umbilical blood flows in the human fetus, but the accuracy of this approach has not been demonstrated in an animal model. METHODS AND RESULTS We compared abdominal aortic and umbilical blood flows determined by Doppler echocardiography in 12 fetal lambs with invasive flow measurements using radionuclide-labeled microsp...

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Fetal Dual Doppler Echocardiography

Dual Doppler echocardiography is a recently developed technique performed using an instrument with two separate sample gates, allowing simultaneous recording of signals from two locations. We describe the use of dual Doppler echo­ cardiography to assess fetal cardiac rhythm. Fetal arrhythmias are common and encountered in 1 to 2% pregnancies. They often resolve spontaneously and do not require ...

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Prediction of Fetal Acidosis by Blood Flow Velocity Waveform of the Fetal Descending Thoracic Aorta

=AbstractZFetal descending thoracic aorta blood flow velocity waveforms were measured in 63 pregnancies. They were either delivered by elective CIS before labor (56 patients) or suffered an antefartum fetal death (7 patients). There was a significant correlation between the aorta waveforms and the cord arterial pH. A cord arterial pH less than 7.20 or an intrauterine fetal death were used as ou...

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Assessment of fetal heart rate variability and velocity variability by Doppler velocimetry of the descending aorta at 10-20 weeks of gestation.

OBJECTIVES Determination of gestational age-related modulations in fetal heart rate and descending aorta blood flow velocity in the early human fetus and comparison of aortic variability data with data obtained from the umbilical artery. It is hypothesized that these modulations present in the umbilical artery also occur in the descending aorta. METHODS Doppler studies of descending aorta vel...

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ژورنال

عنوان ژورنال: Ultrasound in Obstetrics & Gynecology

سال: 2011

ISSN: 0960-7692

DOI: 10.1002/uog.9543