Active clinical trials for "Fetal Weight"

The investigators wish to study the obstetrical data of pregnant women who had an ultrasound estimation of fetal weight and who delivered at the University Hospital of Strasbourg over the last 20 years. These retrospectively collected data are a valuable source of scientific information since they are "real life data", currently of growing interest in the scientific community, and have a large volume and quality due to the number of years included and the variety of information collected in the computerized media records. From this study, the investigators hope not only to better understand the consequences of ultrasound screening for fetal growth, but also to improve its accuracy and to develop useful models in obstetrical decision making in order to decrease maternal and neonatal morbidity.

This study is a randomized, controlled, observational study. 150 nulliparous women with estimated fetal weight ≥3500g at 39-40 weeks of gestation will be enrolled as subjects in the two groups is 1:1. In the experimental group, vaginal examination will be performed at 39 to 40 weeks to assess cervical conditions. If the bishop score <6, the balloon catheter combined with oxytocin induction will be planned at 40 weeks ±3 days. In the control group, one week to 41 weeks ±3 days will be expected. Vaginal examination will be performed again to evaluate cervical conditions. If the bishop score <6 points, and balloon catheter combined with oxytocin induction will be performed. After 96h, their final delivery mode will be recorded. In the following 42 days postpartum, their complications and the neonatal outcome will be followed up.

The aim of this study was to compare maternal, clinical and ultrasound estimations of fetal weight in women with severe (BMI>35) and morbid (BMI>40) obesity and to determine the effect of maternal body mass index (BMI) on these estimations.

Macrosomia and growth restriction are important causes of perinatal morbidity, at or near to term. However, clear identification of 'at risk' foetuses is difficult and clinical estimates of fetal weight are poor. Historically, ultrasound has been used as a second line in such cases but the accuracy of this imaging modality in the mid- to late third trimester is also limited. Estimated fetal weight (EFW) is an important part of the clinical assessment and is used to guide obstetric interventions, when a fetus is small or large for dates. It frequently is the single most important component guiding interventions, such as induction of labour or Caesarean section. Due to the imprecision of ultrasound-derived EFW, particularly in cases of suspected macrosomia in the 3rd trimester, the investigators believe that these estimates should not be used to make important obstetric decisions regarding mode and timing of delivery and that a more accurate method of assessment could produce better outcomes by restricting interventions to those foetuses at greatest risk. Some publications have already demonstrated that magnetic resonance (MR) imaging derived-EFW close to delivery, is more accurate than ultrasound The goal of the present study is thus to compare the performance of magentic resonance imaging derived-EFW, versus ultrasound derived-EFW at 36 weeks of gestation, regarding the prediction of neonatal macrosomia.

Placenta previa is a placenta that implants at lower uterine segment, it occurs in about 0.3-0.5% of pregnancies at term. It is a significant risk for development of maternal morbidity, as well as maternal mortality secondary to maternal hemorrhage . Also, this abnormal placenta has a negative concern about fetal well being due to prematurity and perinatal mortality, in addition to its undesirable effect on fetal growth. Several factors may be behind of the effect of placenta previa on fetal growth. Firstly, the blood supply to the lower uterine segment is less than at the upper segment apparently resulting in less feto-placental blood perfusion . Secondly, recurrent bleeding attacks from placental previa may affect fetal oxygenation and fetal growth. In spite of above evidences; many studies in literature denied the relation between placenta previa and fetal growth and concluded that the association between low birth weight and placenta previa is mainly due to preterm delivery and to a lesser extent with fetal growth restriction. However; the major drawback of all these studies is lacking of reporting the effect of placenta previa of feto-maternal blood flow representing in studying of Doppler blood flow in both uterine and umbilical artery in those patients. The uterine artery blood flow is usually affected by the presence of placenta previa and placenta accreta which reflected on feto-placental blood flow. So the uterine artery Doppler velocimetry is a useful tool for predicting placenta accreta . So in the light of above evidences; we aimed, in the current study, not only to investigate the effect on placenta previa on fetal weight but also to walk around the effect of placenta previa on the uterine and umbilical arteries blood flow in trial to explore this conflicting issue. To our knowledge, no previous trial had studied this interesting subject before.

The aim of this prospective longitudinal study was to investigate the relationship between placental thickness during the second and third trimesters and placental and birth weights.

The hypothesis is to increase the predictability of the ultrasound examination evaluating new fetal parameters: in fact the thickness of the soft tissues can contribute significantly to the fetal weight and the characteristics of the thoracic cage may correlate with the fetal weight.

Ultrasound measurement of cross sectional area of umbilical cord might offer advantage over Hadlock's formula for accurate estimation of actual birth weight at term gestation leading to prevention of large number of maternal and neonatal morbidity and mortality.

This trial is a collaborative study between 4 sites worldwide. A total of 600 research subjects will be enrolled. We will investigate the validity of using 5D Limb Volume software to improve on estimated fetal weight predictions over a broad range of gestational ages. The purpose is to compare the accuracy and precision of birth weight predictions based on this new technology as compared to the current 2D birth weight prediction models.

5D and 2D ultrasound will be done to normal pregnant women between 37 to 42 weeks gestation and fetal weight will be estimated using the hadlock formula using biometry measured by both ultrasounds. Accuracy of 5D ultrasound in determining fetal weight will be determined.