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EP14.02: The role of oligohydraminos in delivery planning of small breech babies at term
Author(s) -
Hollwitz B.G.,
Tavares de Sousa M.,
Ortmeyer G.,
Hecher K.
Publication year - 2018
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 - 10.1002/uog.19996
Subject(s) - medicine , oligohydramnios , obstetrics , fetal distress , breech presentation , population , caesarean section , gestational age , vaginal delivery , birth weight , umbilical artery , cohort , pregnancy , fetus , pediatrics , genetics , environmental health , biology
Methods: Fetal aortic PP was estimated by using pulse wave velocity (PWV) and blood flow velocity at fetal descending aorta. Each motion of the proximal and distal border of the lumen of fetal descending aorta was analysed using Phased Tracking. The velocities were analysed at each point, and the time delay between them was measured. PWV was obtained by dividing the distance between the analysed points by the time delay of the pulse wave. In the Water-Hammer equation, PP is given as follows: PP=ρ×U×PWV, where ρ is blood density, U is blood velocity. The blood velocity was measured by ultrasound with pulse Doppler. We chose an artificial placenta (AP) as a fetus model. Premature lambs (90-137 days; term=147d) were used. Immediately after delivery of the fetuses(n=3), the umbilical vessels were cannulated and connected to the pumpless AP and the carotid catheter was inserted to measure aortic BP. We compared the PPs estimated by using the ultrasound with the PPs measured by the carotid catheter. Results: Median estimated PP by the ultrasound was 17.4mmHg in comparison to 18.0mmHg by the carotid catheter. There was a significant correlation between the PP estimated by using the ultrasound and the PP measured by using the carotid catheter (R2=0.95.p<0.01) (figure1). Conclusions: Assessment of blood velocity and pulse velocity of the descending aorta using PT is an accurate, non-invasive approach to evaluate fetal hemodynamics.