Search Results
Results 401 - 450 of 1457
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Sherer D M - - 2005
OBJECTIVE: To assess whether fetal cerebral vascular resistance is affected by the presence of nuchal cord(s) in the third trimester. METHODS: A set of 115 patients with well-established dates and singleton, appropriate for gestational age (GA), non-anomalous fetuses with nuchal cord(s) diagnosed with prenatal color Doppler imaging, between 28 and ...
French Amy E - - 2005
BACKGROUND: Umbilical cord stricture is a recognized cause of fetal demise, but the exact etiology remains unknown. The risk of recurrence has generally been thought to be low. CASE: Three of 4 fetuses of a single patient died between 28 and 30 weeks of gestation; all were found to have ...
Li H - - 2005
OBJECTIVE: Signs of increased uterine artery vascular impedance in mid-gestation are strongly related to pre-eclampsia later in pregnancy. Whether this is true for the late third trimester is, however, unclear. The aim of the present study was to analyze the frequency of increased uterine artery vascular impedance in the third ...
Predanic Mladen - - 2005
OBJECTIVE: To evaluate interval fetal growth and compare the incidence of small-for-gestational age (SGA) newborns between fetuses with an isolated single umbilical artery and those with a 3-vessel umbilical cord. METHODS: A retrospective, case-controlled study in which 84 singleton pregnancies with an isolated single umbilical artery were compared with 3-vessel ...
Madazli R - - 2005
OBJECTIVE: To assess whether alterations in the serum levels of placental growth factor, activin A and fibronectin could be detected in patients before they become preeclamptic. And to evaluate and compare the clinical utility of these markers and uterine artery Doppler velocimetry in predicting preeclampsia. METHODS: One hundred and twenty-two ...
van Dongen H - - 2005
OBJECTIVES: To compare test characteristics of ultrasound and Doppler parameters in the prediction of fetal anemia in Kell-alloimmunized pregnancies. METHODS: In this prospective study, 27 fetuses at risk for anemia due to Kell alloimmunization were evaluated with ultrasound and Doppler imaging. Spleen perimeter, liver length, middle cerebral artery (MCA) peak ...
To William W K - - 2005
OBJECTIVE: To compare the sensitivity and specificity of different umbilical-cerebral ratios in the prediction and detection of fetal growth restriction in near-term fetuses when the umbilical arterial waveform is within normal. METHODS: A prospective cross-sectional observational study was carried out recruiting consecutive singleton pregnancies with clinically suspected fetal growth restriction ...
Florio Pasquale - - 2005
OBJECTIVE: Urocortin is a placental neuropeptide belonging to the family of corticotropin-releasing factors (CRFs), playing a role in the uteroplacental blood flow regulation through the binding to specific CRF receptors. Since CRF receptors are expressed in the uterine vascular bed of pregnant rats, and because urocortin has a relaxant effect ...
Acharya Ganesh - - 2005
OBJECTIVE: The purpose of this study was to construct new reference ranges for serial measurements of commonly used umbilical artery Doppler indices (pulsatility index, resistance index, and systolic:diastolic ratio). STUDY DESIGN: This was a prospective longitudinal study of the umbilical artery Doppler indices that were obtained serially at the free-loop ...
Lam H - - 2005
OBJECTIVES: To explore the relationship between cerebroplacental Doppler impedance index and birth weight in postdates pregnancies, and to evaluate the use of a combination of Doppler parameters and ultrasound biometry in the prediction of large-for-gestational age (LGA) fetuses at 41 weeks of gestation. METHODS: The pulsatility indices of the umbilical ...
Iura Toshihiko - - 2005
OBJECTIVE: From analysis of fetal renal artery hemodynamics, we attempted to reveal renal glomerular and tubular function in normal fetuses during pregnancy. DESIGN: The study included 36 cases of normal fetuses from the 20th to the 40th week of gestation; V(max) (the systolic peak velocity of main renal artery), V(mean) ...
Bernstein Ira M - - 2005
OBJECTIVE: To examine the effect of pregnancy and the interval between pregnancies on arterial compliance as measured by mean arterial pressure (MAP) and pulse pressure. METHODS: We conducted a 3-month chart review of deliveries at a tertiary care hospital (index pregnancies). Data collected included demographics, obstetric history, blood pressures, prepregnancy ...
Spinillo Arsenio - - 2005
OBJECTIVE: To evaluate the prognostic value of umbilical artery Doppler studies in premature deliveries. METHODS: In this cohort study of 582 singleton pregnancies delivered between 24 and 35 weeks of gestation, we evaluated the ratio of peak-systolic to end-diastolic (S/D) blood flow velocities in the umbilical artery of all the ...
Da Costa Antonio Gadelha - - 2005
We made a longitudinal ultrasonographic study of 33 healthy fetuses from 22 to 38 weeks of gestation to determine the acceleration time in the middle cerebral artery (ATMCA) and its relationship with fetal cardiac output. Doppler ultrasound (US) was performed by a single observer always using the same apparatus. The ...
Wareing Mark - - 2005
BACKGROUND: Fetal growth restriction (FGR) affects up to 8% of all pregnancies and has massive short-term (increased fetal morbidity and mortality) and long-term (increased incidence of cardiovascular disease in adulthood) health implications. Doppler waveform analysis of pregnancies complicated by FGR suggests compromised uteroplacental circulation and placental hypoperfusion. Our aim was ...
Spaanderman Marc E A - - 2005
OBJECTIVE: Evidence is accumulating that fetal growth is influenced by preexisting maternal disorder(s) hampering endothelial function. We tested the hypothesis that in nonpregnant normotensive, formerly preeclamptic women, vascular function predicts the development of fetal growth restriction. METHODS: In 60 formerly preeclamptic women, we measured central hemodynamic and vascular and clotting ...
Wimalasundera Ruwan C - - 2005
OBJECTIVE: Preeclampsia is a common and serious complication of pregnancy, characterized by maternal hypertension and proteinuria, placental insufficiency, and fetal growth restriction. The purpose of this study was to investigate whether intracellular Ca 2+ ([Ca 2+ ] i ) and contractile responses of vascular smooth muscle to vasoactive agents are ...
Predanic Mladen - - 2005
OBJECTIVE: To establish an umbilical cord thickness nomogram from anatomy ultrasound scans performed between 18 and 23 weeks of gestational age in singleton pregnancies, and compare it to two previously published nomograms. MATERIAL AND METHODS: In this retrospective cohort study of 1107 patients, a total of 650 singleton pregnancies were ...
Fok Wing Yee - - 2005
BACKGROUND: The aim of the study was to assess fetal vascular blood flow after amniotomy. METHODS: This was a prospective observational study. Thirty-five women with singleton pregnancy beyond 36 weeks of gestation, who underwent amniotomy, were recruited. The pulsatility indices of the fetal middle cerebral artery (MCA), the renal artery, ...
Daniel-Spiegel Etty - - 2005
OBJECTIVE: To characterize umbilical-placental blood flow gradient during early second trimester of pregnancy. METHODS: Forty normal pregnant women with a singleton fetus gave their informed consent to participate in this study. All scans were preformed between 12 and 20 weeks' gestation using the simultaneous multigate spectral Doppler imaging (MS-SDI) modality ...
Ong Stephen S - - 2005
OBJECTIVE: This study was undertaken to test for structural differences between myometrial radial arteries isolated from women having normal pregnancies and pregnancies complicated by preeclampsia and intrauterine growth restriction. STUDY DESIGN: Pressure myography was used to study myometrial radial arteries obtained at cesarean section. With the use of a transilluminating ...
de Laat Monique W M - - 2005
Our aim was to review the literature on umbilical cord coiling. Relevant articles in English published between 1966 and 2003 were retrieved by a Medline search and cross-referencing. The normal umbilical cord coiling index (UCI) is 0.17 (+/- 0.009) spirals completed per cm. Abnormal cord coiling, i.e. UCI <10th centile ...
van der Heijden Olivier W H - - 2005
The progressive rise in uterine blood flow during pregnancy is accompanied by outward hypertrophic remodeling of the uterine artery (UA). This process involves changes of the arterial smooth muscle cells and extracellular matrix. Acute increases in blood flow stimulate endothelial production of nitric oxide (NO). It remains to be established ...
Figueras Francesc - - 2005
OBJECTIVE: To evaluate the relationship between umbilical artery pulsatility index and the umbilical cord pH in small-for-gestational-age fetuses. METHODS: Data were collected from all pregnancies seen in our Fetal Surveillance Unit that underwent antenatal monitoring for being small-for-gestational-age beyond 24 weeks of pregnancy. A linear regression was used to analyse ...
Narendran Shamanthakamani - - 2005
To study the efficacy of yoga on the outcome of complicated pregnancy, 121 women attending antenatal clinic at Gunasheela Surgical and Maternity Hospital (GSMH) in Bangalore, India, were enrolled between 18-20 weeks of pregnancy in a prospective, matched, observational study. Sixty-eight women were in the yoga group and 53 women ...
Cromi Antonella - - 2005
OBJECTIVE: To investigate whether an atypical umbilical coiling pattern at prenatal sonography is associated with adverse pregnancy outcome. METHODS: A targeted sonographic evaluation of the umbilical cord (UC) was performed in 758 women with singleton gestation, and gestational age above 20 weeks. Atypical coiling was defined as the presence of ...
Pirhonen Jouko - - 2005
PURPOSE: This study was conducted to determine possible maternal age-related changes in uterine artery impedance in normal late pregnancy. PATIENTS AND METHODS: In a cross-sectional design study, Doppler velocimetry of the uterine vessels was performed in 884 pregnant women with normal, late, singleton pregnancies. We hypothesized that maternal age is ...
Gojnic M - - 2005
During a four-year period we analyzed the significance, sensitivity and sensibility of myoma Doppler flow during pregnancy in relation to the course and outcome of the pregnancy and to later histopathological findings. By following 36 older primigravidas with determined myomas, we observed the course of the pregnancies in all trimesters ...
Anastasiadis P - - 2005
OBJECTIVES: To elucidate the hemodynamics of the uterine artery in normal and abnormal pregnancies by use of Doppler ultrasound and SQUID biomagnetometry. METHOD: Two hundred and three women (gestational age 28-42 weeks) were included in the study. Forty-three of them had preeclampsia and/or intrauterine growth restriction and 160 were normal. ...
Galan Henry L - - 2005
OBJECTIVE: Our objective was to test the hypothesis that systemic blood pressure (BP) is increased above normal in intrauterine growth restricted (IUGR) fetal lambs with elevated umbilical artery (UmA) Doppler indices. STUDY DESIGN: Five pregnant ewes were exposed to hyperthermic conditions for 80 days beginning at 40 days' gestation (dGA) ...
Caughey Aaron B - - 2005
OBJECTIVE: The purpose of this study was to determine whether, when, and how rates of short-term neonatal complications increase beyond 37 weeks of gestation. STUDY DESIGN: A retrospective cohort study was conducted of all low-risk, term, cephalic, and singleton births that were delivered at the University of California, San Francisco, ...
Hershkovitz Reli R Maternal Medicine Clinic, The Obstetric Hospital, University College London Hospitals NHS Trust, London, - - 2005
To determine the value of uterine artery velocimetry and mid-trimester maternal serum AFP/hCG measurements in predicting pregnancy complications in a high-risk group of pregnant patients. Eighty-eight patients with chronic hypertension, previous preeclampsia, and thrombophilia were included. Maternal serum AFP/hCG was examined between 15-16 weeks gestation. Levels > 3 multiple of ...
Tuxen A J - - 2005
The aim was to determine experimentally the factors that increase the risk of venous occlusion by applying a standardised tightening force to isolated perfused umbilical cords tied in a true knot in vitro. Umbilical cords were collected from patients undergoing Caesarean section. Cords were clamped, isolated and studied within 15 ...
Guclu S - - 2004
OBJECTIVE: To evaluate the effect of nifedipine on placental and fetal middle cerebral and atrioventricular Doppler waveforms. METHODS: Doppler waveforms of uterine (UtA), umbilical (UA) and middle cerebral (MCA) arteries and both atrioventricular valves were measured from 21 pregnant women/fetuses prior to and during nifedipine therapy for preterm labor. Maternal ...
Tranquilli Andrea L - - 2004
OBJECTIVE: To determine to what extent adverse pregnancy outcomes are associated with thrombophilia. STUDY DESIGN: We studied 31 women who had HELLP syndrome, placental abruption, fetal growth restriction or unexplained stillbirth (study group), matched with 12 controls. All women were tested for: Factor V, Prothrombin, methylenetetrahydrofolate reductase gene (MTHFR) mutations; ...
Palacio M - - 2004
OBJECTIVE: To construct normal ranges for umbilical artery pulsatility index (UA PI), middle cerebral artery pulsatility index (MCA PI) and cerebroplacental ratio (CPR) in prolonged pregnancies according to strict methodological criteria using polynomial regression analysis. METHODS: This was a retrospective, cross-sectional observational study involving 140 women, 10 women for each ...
Skulstad Svein Magne - - 2005
BACKGROUND: Umbilical vein constriction at the fetal abdominal inlet is a common finding after week 13, when the period of umbilical herniation is brought to an end. AIMS: To test the hypothesis that a constricting umbilical ring within physiological ranges affects fetal hemodynamics by either pooling blood in the placenta ...
Jó┼║wik Maciej - - 2005
The current evidence on the primary source of ammonia production in the human fetoplacental unit is potentially misleading. The aim of the present investigation was to determine the concentration of ammonia in human maternal and fetal blood at birth and to compare them with published data in late gestation sheep. ...
Leung W C - - 2004
OBJECTIVE: To investigate the correlation between Doppler parameters in the umbilical and fetal middle cerebral arteries and pregnancy outcome in women with gestational diabetes mellitus (GDM). METHODS: A prospective study was performed on 169 singleton GDM pregnancies in a university teaching hospital from January to December 2002. Umbilical artery (UA) ...
Viero S - - 2004
Our objective was to evaluate the utility of gray-scale placental ultrasound for the detection of pathological lesions in the placentas of preterm pregnancies with abnormal fetoplacental blood flow (defined by absent or reversed end-diastolic flow velocities [ARED] in the umbilical arteries) before 32 weeks of gestation. Sixty consecutive structurally and ...
Ozturk Ozkan - - 2004
The objective of this study was to evaluate the role of uterine, endometrial and follicular blood flow in prediction of ongoing pregnancy after assisted conception. A prospective observational study was conducted on 53 women undergoing IVF treatment. Transvaginal colour and pulsed Doppler measurements were performed on the day that pituitary ...
Predanic Mladen - - 2004
OBJECTIVE: To evaluate and compare umbilical cord thickness of aneuploid fetuses with umbilical cord diameter nomograms generated from euploid fetuses between 14 and 23 weeks' gestational age. METHODS: A retrospective study was conducted in which 56 fetuses and neonates had diagnoses of abnormal karyotypes, of which 46 fetuses had numerical ...
Gojnic M - - 2004
OBJECTIVE: Pregnancies with myomas are known to have an increased risk for complications such as abruptio placentae, dysfunctional labor, growth of the tumor, necrosis and delivery problems, but prediction is still difficult based on clinical and real-time ultrasound evaluations alone. METHODS: We evaluated 15 patients with submucosal, intramural and subserous ...
Shih J C - - 2004
The relationship of large and vascularized chorioangiomas to adverse pregnancy outcome is well recognized. We present a patient with a large placental tumor and signs of impending fetal cardiac failure. The angioarchitecture of the tumor depicted by three-dimensional (3D) power Doppler ultrasound enabled us to accurately diagnose a placental chorioangioma. ...
Bard Harry - - 2004
S-nitrosohemoglobin (HbSNO), where hemoglobin (Hb) is nitrosated at Cysbeta93, presumably controls delivery of the vasorelaxant nitric oxide (NO) to hypoxic tissues in an oxygen-sensitive manner. Little is known about how Hb regulates NO bioavailability during fetal development. A study was planned to determine the levels of HbSNO and HbFe(II)NO (NO ...
Kinzler Wendy L - - 2004
OBJECTIVE: To estimate the pattern of maternal vascular reactivity in normal and high-risk pregnancies using postocclusion brachial artery diameter. METHODS: Prospective, longitudinal study of 44 low-risk singleton pregnancies and 28 high-risk pregnancies, defined as pregestational diabetes (n = 7), chronic hypertension (n = 4), twin gestation (n = 6), and ...
Cheema R - - 2004
OBJECTIVE: In previous pilot studies, fetal vein of Galen (GV) blood velocity has been shown to be non-pulsatile in normal pregnancies. A pulsating pattern in high-risk pregnancies has been related to adverse outcome of pregnancy. The aim of this study was to establish reference ranges for fetal cerebral venous blood ...
Perri Tamar - - 2004
OBJECTIVE: Elevated counts of nucleated red blood cells (NRBCs), as well as prolongation of pregnancy, have been suggested as predictors of adverse perinatal outcome. However, the association between these 2 variables has received only minimal attention. We sought to evaluate fetal NRBCs in prolonged pregnancies. METHODS: Umbilical cord blood was ...
Veerareddy Sukrutha - - 2004
OBJECTIVES: The purpose of this study was to determine if maternal undernutrition during pregnancy altered myogenic tone in small radial uterine arteries. STUDY DESIGN: Myogenic tone of radial uterine arteries was studied from late pregnant rats (day 20) that were fed either ad libitum or globally restricted diet (moderately severe ...
Ritter Stefan - - 2004
OBJECTIVE: The measurement and evaluation of ductus venosus (DV) blood flow velocity waveform in high-risk pregnancies has been studied intensively in recent years in order to find a more intermediate signal of fetal compromise. Our objective was to study the fetal outcome of pregnancies with intrauterine growth retardation (IUGR) and ...
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