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  • Title: [Doppler sonography--effect of fetal position, site of the placenta and measurement site of the fetal aorta].
    Author: Rühle W, Ertan AK, Gnirs J, Boos R, Schmidt W.
    Journal: Z Geburtshilfe Perinatol; 1991; 195(2):61-4. PubMed ID: 1887653.
    Abstract:
    The influence of fetal position, the site of placenta and the site of measurement in the fetal aorta on doppler-flow parameters was investigated in patients with uncomplicated pregnancies. In 20 cases the S/D-ratio was obtained in three different regions of the descending aorta. Measurements superior the renal vessels showed comparable values (4.1-4.3). No differences were found between signals obtained cranial or caudal of the diaphragma. Measurements at the aortal bifurcation showed significantly increased median values (6.6, p less than 0.05). No differences could be obtained concerning the influence of fetal position or site of placenta on S/D-ratio. All median values of a total of 197 patients were in the range of 4.8. Therefore it may be concluded that the above mentioned parameters do not have significant influence on doppler flow parameters in fetal vessels. However, a proximal site of measurement in the descending aorta fetalis should be reassured.
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