نتایج جستجو برای: first trimester
تعداد نتایج: 1448121 فیلتر نتایج به سال:
BACKGROUND It is uncertain how best to screen pregnant women for the presence of fetal Down's syndrome: to perform first-trimester screening, to perform second-trimester screening, or to use strategies incorporating measurements in both trimesters. METHODS Women with singleton pregnancies underwent first-trimester combined screening (measurement of nuchal translucency, pregnancy-associated pl...
OBJECTIVE To ascertain, by means of a questionnaire, women's preferences for four different approaches to prenatal screening for Down syndrome. METHODS Women attending antenatal clinics at six UK maternity units were asked to put in order of preference four different approaches to screening for Down syndrome all of which had the same false positive rate of 5%. The options were: (1) first-trim...
AIMS This study compares different screening strategies for the detection of Down syndrome and considers practical implications of using multiple screening protocols. METHODS The performance characteristics of each screening strategy were assessed based on datasets of Down syndrome (n=11) and unaffected pregnancies (n=1006) tested in both first and second trimester, as well as data from first...
OBJECTIVE To study the pregnancy outcomes in first trimester vaginal bleeding. MATERIALS AND METHODS This cross sectional study was done on 60 pregnant women with first trimester vaginal bleeding referring to university hospitals affiliated to Islamic Azad University, Tehran, Iran. All women were evaluated for the outcomes including abortion, preterm rapture of membranes, preterm labor, secon...
the scientific literature regarding threatened abortion is relatively limited on the subject of outcomes and viability at term. to investigate prospectively the risk of adverse pregnancy outcome in women presenting with first-trimester threatened miscarriage, a prospective case control study was performed on 600 subjects, 150 women presenting with bleeding in the first trimester and 450 asympto...
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background: a significant number of pregnancies, particularly in women with previous histories of infertility, are associated with fetal abnormalities. methods such as the nuchal translucency (nt) measurement enable us to identify more pregnancies with chromosomal abnormalities. materials and methods: this analytic cross-sectional study was performed in 446 pregnant women at 11-14 weeks gestati...
OBJECTIVE To determine the rate of positive group B streptococcus (GBS) cultures at 35-37 weeks gestation in women who have first trimester asymptomatic GBS bacteriuria. METHODS Pregnant women with asymptomatic first trimester GBS bacteriuria had genital cultures for GBS performed at 35-37 weeks gestational age. Serotyping was performed by the standard Lancefield capillary precipitin method. ...
BACKGROUND The impact of prenatal lead exposure on neurodevelopment remains unclear in terms of consistency, the trimester of greatest vulnerability, and the best method for estimating fetal lead exposure. OBJECTIVE We studied prenatal lead exposure's impact on neurodevelopment using repeated measures of fetal dose as reflected by maternal whole blood and plasma lead levels. METHODS We meas...
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