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May 18, 2021 — A team of researchers funded by the美国国立卫生研究院has developed a newultrasoundtechnique to monitor theplacentafor impaired fetal blood flow early in pregnancy. The technique, which uses conventional ultrasound equipment, relies on subtle differences in the pulsation of fetal blood through the arteries at the fetal and placental ends of the umbilical cord, potentially enabling physicians to identify placental abnormalities that impair fetal blood flow and, if necessary, deliver the fetus early. Like current ultrasound techniques, the new technique can also detect impaired flow of maternal blood through the placenta.
The study was conducted byJohn G. Sled, Ph.D., of The Hospital for Sick Children in Toronto, and colleagues. It appears ineBioMedicine. Funding was provided in part by NIH'sEunice Kennedy Shriver National Institute of Child Health and Human Development.
Researchers tested the new technique with ultrasound scans on women between the 26th and 32nd weeks of pregnancy and diagnosed those with circulatory problems in the maternal or fetal part of the placenta. After the women gave birth, the diagnoses were verified by comparing them to the results of physical examination of the placentas they delivered. Among them, 40 women had placentas without circulation problems, 16 had placentas with fetal circulation problems, and 30 had maternal placenta circulation problems.
The authors say their method provides a way to diagnose circulation problems in the placenta that can harm the fetus and would otherwise go undetected until late in pregnancy.
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August 10, 2022
