Search Results
Results 601 - 650 of 1457
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Martin A M - - 2001
OBJECTIVE: To examine the value of uterine artery Doppler at 11-14 weeks of gestation in the identification of women at risk of developing pre-eclampsia and fetal growth restriction. METHODS: Uterine artery Doppler was carried out at 11-14 weeks in 3324 consecutive singleton pregnancies attending for routine care in three London ...
Krampl E R - - 2001
OBJECTIVE: To determine uterine artery impedance using Doppler in the second and third trimesters at sea level and at high altitude. METHODS: Uterine artery resistance and pulsatility indices (RI and PI, respectively) were obtained by Doppler velocimetry from 242 women in Cerro de Pasco (4300 m altitude) and 200 women ...
Hecher K - - 2001
OBJECTIVE: To describe the time sequence of changes in fetal monitoring variables in intrauterine growth restriction and to correlate these findings with fetal outcome at delivery. METHODS: This was a prospective longitudinal observational multicenter study on 110 singleton pregnancies with growth-restricted fetuses after 24 weeks of gestation. Short-term variation of ...
Schuchter K - - 2001
OBJECTIVE: To evaluate placental volume and uterine artery Doppler in the first trimester in the prediction of pregnancies that subsequently develop pre-eclampsia, pregnancy-induced hypertension, preterm placental abruption or fetal growth restriction. METHODS: In 380 singleton pregnancies attending our center for nuchal translucency screening at 11-14 weeks of gestation, Doppler assessment ...
Delle Chiaie L - - 2001
OBJECTIVE: To establish whether asymptomatic normotensive pregnant women with an abnormal uterine Doppler velocimetry, have haematological changes characteristic of congenital or acquired thrombophilia, and whether this information improve predict in pregnancy complications. STUDY DESIGN: A prospective study involved the enrolment of 30 healthy normotensive pregnant women between the 23rd and ...
Kametas N A - - 2001
OBJECTIVE: To evaluate changes in left ventricular mass and diastolic function during normal pregnancy. METHODS: This was a cross-sectional study of 125 pregnant women at 9-42 weeks of gestation and 19 non-pregnant female controls. Two-dimensional and M-mode echocardiography of the maternal left ventricle and left atrium was performed. RESULTS: During ...
Deren O - - 2001
OBJECTIVE: To examine the effect of antenatal steroids on the biophysical profile and the Doppler parameters of umbilical and middle cerebral arteries of healthy fetuses. STUDY DESIGN: Thiry-five singleton pregnancies between the gestational ages of 28 and 34 weeks, who received two consecutive doses of betamethasone 24h apart to accelerate ...
Carbillon L - - 2001
Active perifollicular angiogenesis in ovaries and endometrium is linked with the quality of oocytes and endometrial receptivity, and consequently with the outcome of implantation. Studies evaluating ovarian velocimetry in relation to implantation and pregnancy rates bring essentially into play velocity values or non-quantitative parameters, whose reproducibility is low and which ...
Dubiel M - - 2001
BACKGROUND: Pulsation in the flow velocity waveform in the umbilical vein is related to perinatal mortality but the flow velocity waveform in the fetal vein of Galen is normally even and without fluctuation. OBJECTIVES: To establish whether blood flow velocity pulsations in the vein of Galen in high-risk pregnancies are ...
Valensise H - - 2001
OBJECTIVE: To study second-trimester maternal cardiac adaptation in asymptomatic patients at risk, on the basis of abnormal uterine artery Doppler, for the development of gestational hypertension or having a small-for-gestational age fetus. Fetal and maternal outcomes were verified at the end of pregnancy. METHODS: Thirty-six normotensive women with abnormal uterine ...
Carbillon L - - 2001
In the first weeks of pregnancy, columns of endovascular cytotrophoblastic plugs develop in the lumen of spiral arteries. Morphologic data show that these plugs become loosened as soon as the end of the second month and the intervillous circulation of maternal blood is likely to be established progressively between the ...
Hsu T Y - - 2001
BACKGROUND: We attempted to establish normal Doppler flow velocity waveform patterns in the human fetal ductus venosus (DV), and also to establish a standardized measurement technique. METHODS: Ductus venosus blood flow was measured in a prospective study involving 545 fetuses aged between 8 and 38 weeks in utero, the mothers ...
Perrotin F - - 2001
The fetal umbilical and cerebral Doppler changes were recorded in a 27-year-old primigravida referred at 38 weeks for the treatment of an iliofemoral vein thrombosis. On admission and in comparison to a previous Doppler assessment systematically performed during growth scan at 37 weeks, the umbilical resistance index (URI) demonstrated an ...
Brooks V L - - 2001
Pregnancy produces marked systemic vasodilation, but the mechanism is unknown. Experiments were performed in conscious rabbits to test the hypotheses that increased nitric oxide (NO) production contributes to the increased vascular conductance, but that the contribution varies among vascular beds. Rabbits were instrumented with aortic and vena caval catheters and ...
Veille J C - - 2001
OBJECTIVE: The purpose of this study was to determine the effects of pregnancy and of maximal exercise on left ventricular diastolic filling response. STUDY DESIGN: Transmitral pulsed Doppler echocardiography was obtained in 10 healthy women during each trimester of pregnancy and at 12 weeks after delivery. Doppler studies were performed ...
Saburi Y - - 2001
BACKGROUND: Blood flow is calculated from mean velocity across the vessel and its cross-sectional area and is related to the fetal growth. AIM: To investigate the relationship between diameter pulse waveform (DPW) and flow velocity waveform (FVW) in the fetal descending aorta during fetal development. STUDY DESIGN: Doppler ultrasound and ...
Carmona F - - 2001
PROBLEM: Pregnancies in women with antiphospholipid syndrome (APS) are associated with obstetric complications despite treatment. The present study analyzes risk factors and evaluates fetal outcome in a large sample of treated APS pregnancies. METHOD OF STUDY: Seventy-seven pregnancies in 56 women were included. Twelve selected variables potentially related to the ...
Mäkikallio K - - 2001
OBJECTIVE: To determine the influence of vaginal bleeding with or without a persisting subchorionic hematoma on uteroplacental, umbilicoplacental and yolk-sac hemodynamics in early pregnancy. DESIGN: Twenty-six consecutive patients with vaginal bleeding entered this longitudinal study 1-3 days after the beginning of vaginal bleeding and were re-examined every 1-2 weeks. In ...
Makino Y - - 2001
Adrenomedullin (AM) is a potent vasodilator. Pregnancy-induced hypertension (PIH) is a common cause of maternal or fetal mortality. We measured the changes of adrenomedullin receptor components gene expression, receptor activity-modifying protein 2 (RAMP2) and calcitonin receptor-like receptor (CRLR), at feto-maternal tissues in human normotensive pregnant women and pregnancy-induced hypertensive women ...
Hershkovitz R - - 2001
OBJECTIVE: To determine obstetrical risk factors and pregnancy outcome of fetuses with true knot of the umbilical cord. METHODS: Study population included 69,139 singleton deliveries occurring between the years 1990-1997. Data were retrieved from the database of the Soroka University Medical Center. Fetuses with malformations were excluded. RESULTS: The incidence ...
McAuliffe F - - 2001
OBJECTIVE: 1. To measure blood gases and minute ventilation in healthy women with normal pregnancies, compare with non-pregnant women both at sea level and at high altitude; 2. to relate the results at altitude with duration of residence there. DESIGN: Cross-sectional study. SETTING: Antenatal clinics at sea level in Lima, ...
Hafner E - - 2001
Uterine artery Doppler examination can identify impaired trophoblast invasion in the second trimester of pregnancy. High resistance and an early diastolic 'notch' show insufficient physiological conversion of the spiral arteries. Uterine artery Doppler is routinely performed between 22-24 weeks which is relatively late for treatment. In this study we wanted ...
Lees C - - 2001
OBJECTIVE: To provide individualized risk prediction of severe adverse pregnancy outcome based on uterine artery Doppler screening at 23 weeks. METHODS: Color Doppler assessment of the uterine arteries was carried out in 5121 women attending for routine care at 23 weeks in two inner-city obstetric units. The mean uterine artery ...
Stigter R H - - 2001
OBJECTIVES: To examine changes with time in the fetal renal circulation by Doppler sonography in the severely growth-restricted preterm fetus during the period of gradual deterioration prior to delivery, and to examine the relationship between Doppler measurements, amniotic fluid index, birth weight and fetal condition at birth. METHODS: This was ...
Borrell A - - 2001
OBJECTIVE: The purpose of this study was to assess the fetal outcome of first-trimester pregnancies with reversed end-diastolic flow in the umbilical artery. STUDY DESIGN: Doppler studies in the umbilical artery were carried out in 2970 consecutive pregnancies scanned at 10 to 14 weeks. RESULTS: We observed 11 (0.4%) cases ...
Geipel A - - 2001
BACKGROUND: An increased incidence of pregnancy complications following assisted reproduction has been reported. The use of uterine artery Doppler ultrasound may aid the prediction of such complications. METHODS: Doppler was performed at 18-24 weeks gestation in 114 singleton and 32 twin pregnancies after intracytoplasmic sperm injection (ICSI) and compared with ...
Owens H - - 2001
PURPOSE: To quantify the tear spreading velocity and stabilization time after blinks in healthy patients. METHODS: Video recordings (magnification, x130) were made of the movements of naturally occurring particles in the tear film while patients blinked naturally. After each blink, tear spreading velocity was computed every 40 milliseconds from particle ...
Chang C C - - 2001
BACKGROUND: Middle cerebral artery (MCA) detection is useful in monitoring fetal well-being. Knowledge of Doppler flow velocity of the fetal MCA may assist in prenatal diagnosis and management of complicated pregnancies. The aim of this study was to compare the pulsatility index (PI) and resistance index (RI) of the MCA ...
Blackwell S C - - 2001
OBJECTIVE: Elevated levels of inflammatory cytokines in the fetus have been linked to neurologic morbidities in preterm neonates. Magnesium sulfate is currently being studied in clinical trials as a potential fetal neuroprotective agent. The purpose of this study was to determine whether intrapartum magnesium sulfate therapy has an effect on ...
Westergaard H B - - 2001
OBJECTIVES: To reanalyze randomized controlled trials on the use of umbilical artery Doppler velocimetry in high-risk pregnancies and determine which high-risk pregnancies benefit from the use of Doppler velocimetry. METHODS: Searching Medline, the Cochrane Library and Embase we found 13 randomized controlled trials on the use of Doppler velocimetry in ...
Pfarrer C - - 2001
Both the fetal and maternal microvasculature of bovine placentomes was examined by scanning electron microscopy of vascular casts. So far the development of the vascular architecture of the bovine placentome in early gestation has only been studied 2-dimensionally due to technical difficulties arising from the fragility of the early placental ...
Aardema M W - - 2001
This study was conducted to investigate the association between uterine artery Doppler flow patterns and uteroplacental vascular pathology in normal and complicated pregnancies in view of the recently described concept of heterogeneous causes of hypertensive pregnancy complications. Forty-three women whose pregnancies were complicated by pre-eclampsia, the HELLP (Haemolysis, Elevated Liver ...
Johnson P - - 2001
OBJECTIVE: To examine longitudinal changes in middle cerebral artery blood flow assessed by Doppler in severely growth restricted fetuses. METHODS: Eighteen structurally normal singleton pregnancies complicated by suspected intrauterine growth restriction were monitored by serial measurement of the pulsatility index of the middle cerebral artery over 7 to 72 days. ...
Satgé D C - - 2001
A therapeutic abortion was conducted on a 17-week-old male fetus with a large umbilical cord teratoma associated with an exomphalos. A review of the literature revealed ten other cases of umbilical cord teratoma and shows that these tumors have a very polymorphic presentation. Four fetuses and infants died from various ...
Fadda G M - - 2001
OBJECTIVE: To assess the usefulness of placental and fetal Doppler velocimetry in the surveillance of gestational diabetes mellitus (GDM). STUDY DESIGN: We studied 89 patients with GDM. All fetuses underwent umbilical, fetal descending thoracic aorta and fetal middle cerebral artery pulsatility index (PI) assessment. Doppler results were not used for ...
Georgiou H M - - 2001
OBJECTIVE: The aim of these studies was to compare venous perfusion in umbilical cords subjected to a standardized tight encirclement force. Comparisons were made between cords from normal pregnancies and those complicated by gestational diabetes mellitus and intrauterine growth restriction. STUDY DESIGN: The cannulated cord segment was wrapped around a ...
Morales-Roselló J - - 2001
PURPOSE: The purpose of this study was to evaluate the fetal brachial artery resistance index (RI), its changes throughout gestation, and its relationship to the umbilical artery RI. METHODS: One hundred fifty-four sonographic examinations of the brachial and umbilical arteries in 71 fetuses were performed between 12 and 40 weeks' ...
Dubiel M - - 2001
OBJECTIVE: Prospectively evaluate semi-quantitative computer analysis of power Doppler (PD) signals in the placenta, tetal brain, lung, liver, kidney and spleen in high-risk pregnancies in relationship to perinatal outcome and also to compare tissue blood flow in the fetal brain and placenta with Doppler velocimetry. METHODS: PD signals were recorded ...
Soregaroli M - - 2001
OBJECTIVE: To test whether late normalisation of abnormal uterine velocimetry is a favourable prognostic factor in high risk pregnancies. STUDY DESIGN: Uterine artery colour Doppler velocimetry was performed at 24, 28-30 and 32-34 weeks in 282 high risk pregnancies treated with low dose aspirin. RESULTS: 88 patients had abnormal waveforms ...
Zeisler H - - 2001
OBJECTIVE: To evaluate the influence of acupuncture on the blood flow in the umbilical artery (UA), fetal aorta and uterine artery and on the fetal heart rate using two different acupuncture points (SP-6 (Sanyinjiao) and LI-4 (Hegu)). METHODS: In group A (n = 50), measurements (Doppler ultrasound and fetal heart ...
Bar J - - 2001
PURPOSE: The aim of this study was to investigate the effect of thromboprophylactic therapy on fetal and maternal Doppler flow parameters in pregnant women with severe complications in previous pregnancies and evidence of acquired or congenital thrombophilia in the current pregnancy. METHODS: Sixty-five patients with a history of recurrent abortions, ...
McCowan L M - - 2001
In a cohort of normotensive small-for-gestational-age (SGA) pregnancies, we aimed to determine the prevalence of later preeclampsia and gestational hypertension. We hypothesised that (i) uterine artery Doppler abnormalities would increase in severity from those with normotension to gestational hypertension to preeclampsia and (ii) the severity of uterine artery Doppler abnormalities ...
Pierce B T - - 2001
OBJECTIVE: We report the frequency of associated congenital abnormalities in fetuses with a single umbilical artery as well as the sensitivity, specificity, positive predictive value and negative predictive value of ultrasound for detecting these abnormalities. We also report the pregnancy outcome of fetuses complicated by single umbilical artery, both isolated ...
Koga T - - 2001
OBJECTIVE: To study the fetal cardiac isovolumetric contraction time in normal and complicated pregnancies with placental vascular disease using a newly developed digital Doppler cardiography system. DESIGN: A preliminary case-control study. SETTING: Tertiary referral hospital. SAMPLE: One hundred and sixteen normal fetuses (20 to 40 weeks) and 55 complicated pregnancies ...
Belfort M A - - 2001
BACKGROUND: There are few longitudinal data currently available detailing the normal changes in maternal cerebral hemodynamics during human pregnancy. This lack of information limits the study of pregnancy-associated cerebrovascular adjustments and, in particular, preeclampsia, where the brain appears to be especially susceptible to ischemic and encephalopathic injury. Our objective was ...
Hsieh Y Y - - 2001
OBJECTIVES: To assess vascular impedance at three different locations in the middle cerebral artery (MCA) in normal fetuses throughout gestation. MATERIALS AND METHODS: Uncomplicated singleton pregnancies at 15-40 weeks' gestation in which Doppler surveys of both MCAs could be obtained were recruited. The pulsatility index (PI) and resistance index (RI) ...
Oztunç F - - 2001
Fetal echocardiography can be used to detect congenital heart disease prenatally with a high degree of accuracy, and complex heart malformations have also been clearly described in the fetus. However, it is difficult to diagnose correctly or to exclude definitely aortic coarctation by fetal echocardiography. A 23-year-old woman was referred ...
Seoud M - - 2001
Spontaneous umbilical cord hematoma is very rare. We present a newborn who was discovered to have a spontaneous fetal umbilical cord hematoma. A nonreassuring fetal heart tracing complicated the first and second stages of labor. The only pathological finding was a short umbilical cord, which could have contributed to the ...
Kalache K D - - 2001
AIMS: We wanted to investigate whether experimental dietary manipulations during early pregnancy influence placental growth and subsequently the cardiovascular system as assessed non-invasively by ultrasonography in the sheep fetus. METHODS: 21 ewes bearing singletons of uniform age were randomly assigned for the first half of pregnancy to one of the ...
Onen A - - 2001
PURPOSE: Considering the accompanying hemodynamic changes Doppler studies have recently been performed for early diagnosis of intrauterine growth restriction (IUGR) cases with high morbidity and mortality. In the present study, Doppler study of the fetal thoracic aorta was conducted and the sensitivity and specificity of the study was assessed in ...
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