Fetal hemodynamics evaluated by Doppler velocimetry in the second half of pregnancy |
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| Authors: | Gadelha Da Costa Antonio Mauad Filho Francisco Spara Patricia Barreto Gadelha Eduardo Vieira Santana Netto Pedro |
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| Affiliation: | 1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. National Engineering Research Center for Magnesium Alloys, Chongqing 400030, China;3. Nano Biochip Research Group, Institute of Nano Electronic Engineering (INEE), University Malaysia Perlis (UniMAP), 01000 Kangar, Perlis, Malaysia;1. Institute of Physics of Materials ASCR, CEITEC IPM, Žižkova 22, 61662, Brno, Czech Republic;2. Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058 Erlangen, Germany;1. Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao 066004, PR China;2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;1. School of Physical and Telecommunication Engineering, South China Normal University, Guangzhou 510006, Guangdong, China;2. BTR New Energy Materials INC, Shenzhen 518000, PR China;3. School of chemistry, Xiangtan University, Xiangtan 411105, PR China;1. International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad 500005, Andhra Pradesh, India;2. Department of Materials Science and Engineering, Indian Institute of Technology Hyderabad, Yeddumailaram 502205, Andhra Pradesh, India |
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| Abstract: | The objective of our study was to assess fetal hemodynamics by Doppler velocimetry during the second half of pregnancy. We carried out a longitudinal study on 33 normal fetuses between the 22nd and 38th weeks of gestation. Doppler velocimetry was performed in the aorta, suprarenal (SRA) and infrarenal (IRA) segments, middle cerebral artery (MCA) and umbilical artery (UA), on the basis of fetal peak systolic velocity (SV), end-diastolic velocity (DV) and resistance index (RI). We used a sample volume of 1 mm, a wall filter of 50 to 100 Hz, a 5 degrees to 19 degrees insonation angle in the MCA and UA, and below 60 degrees in the SRA and IRA. Between the 22nd and 38th weeks of gestation, SV and DV increased in all fetal arteries (p<0.05), but SV decreased in the UA from 52.5 to 46.2 cm/s between the 34th and 38th gestational weeks (p<0.05). The RI was unchanged in the SRA and throughout most of the gestational weeks in the IRA (p>0.05), but decreased from 0.69 to 0.56 in the UA (p<0.05). In the MCA, it decreased from 0.85 to 0.75 between the 26th and 38th gestational weeks (p<0.05). In conclusion, the volume of blood flow in the fetal organs necessary for their development is related to increased SV and DV and to decreased RI. The Doppler velocimetry measurements for normal fetuses could be compared with those for fetuses in high-risk pregnancies. |
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