Search Results
Results 351 - 400 of 1458
< 3 4 5 6 7 8 9 10 11 12 13 >
Elsandabesee D - - 2006
Uterine artery Doppler waveform analysis is not offered in routine antenatal care in the UK. The aim of this study is to evaluate a policy of offering uterine artery Doppler ultrasound, in the setting of a District General Hospital, to women who are judged to be at high risk of ...
Gorokhovsky Roman - - 2006
The influence of blood flow impedance in subendometrial arteries on embryo implantation rate was investigated by transvaginal sonographic examination in in vitro fertilization (IVF) cycles. A total of 39 women undergoing IVF treatment were evaluated along the treatment cycle. Power and spectral Doppler studies of subendometrial arteries were performed to ...
Ng Ernest Hung Yu - - 2006
BACKGROUND: A good blood supply to the endometrium is usually considered as an essential requirement for implantation. OBJECTIVE: The aim of this study was to evaluate the role of endometrial and subendometrial vascularity in the prediction of pregnancy during frozen-thawed embryo transfer (FET) cycles. METHODS: Women undergoing FET in natural ...
Ganapathy R - - 2006
BACKGROUND: Abnormal uterine artery Doppler indices are associated with pregnancy complications such as pre-eclampsia and intrauterine growth restriction. Poor trophoblast invasion may be a consequence of, or be associated with, abnormal Doppler indices. OBJECTIVE: To evaluate in vitro trophoblast function following exposure to first-trimester serum from pregnancies with high uterine ...
Iura Toshihiko - - 2006
In a case of cephalothoracopagus, the umbilical artery (UA) was observed with color Doppler method, and the findings were compared with the hemodynamics of 46 normal fetuses. The patient was a 25-year-old primigravida who had appeared for routine prenatal visits since her 6th week of pregnancy. At a later time, ...
Pietryga Marek - - 2006
OBJECTIVE: To evaluate if maternal glucose level and growth of the fetus were related to placental vascular impedance in pregnancy complicated by gestational diabetes mellitus. MATERIAL AND METHODS: A retrospective study of 146 gestational diabetic women of which 117 needed insulin therapy. Glycosylated hemoglobin (HbA1c) was evaluated as well as ...
Srinivasan Anjana - - 2006
BACKGROUND: True umbilical cord knots are rare, but may be associated with intrapartum fetal distress and perinatal complications. CASE: This report describes a pregnancy complicated by intrauterine growth restriction and oligohydramnios. The labour was complicated by a non-reassuring fetal heart rate tracing. Four umbilical cord knots were discovered at the ...
Basgül Alin - - 2006
Here we report a case of conjoined twins that were diagnosed antenatally by routine two-dimensional transvaginal ultrasound examination at as early as the 9th week of gestational age. The fetuses were of the thoraco-omphalopagus type and were sharing the liver, as confirmed by color Doppler. There was a reversed flow ...
Araujo Júnior E - - 2006
Vasa previa occurs in pregnancy when one of the membrane vessels extends down to the level of the internal cervical os, ahead of the fetal presenting part and unsupported by the placenta tissue or umbilical cord. The rupture of the vessels might happen spontaneously or artificially and frequently results in ...
Cheema Riffat - - 2006
BACKGROUND: Doppler ultrasound examination has become an established method of clinical surveillance in high-risk pregnancies. Doppler indication of fetal brain sparing (BS) is an acknowledged sign of circulation redistribution during chronic hypoxia. OBJECTIVES: To evaluate the relationship between placental vascular resistance and signs of BS in middle cerebral artery (MCA) ...
Peng Hong Qi - - 2006
Although umbilical cord stricture and umbilical cord overcoiling have been established as causes of intrauterine fetal demise, relatively few studies addressed this issue, most of them being case reports. We reviewed a total of 268 fetal autopsies during a 3-year period from 1998 to 2001. One hundred thirty nine cases ...
Bartha Jose L - - 2006
OBJECTIVE: To evaluate the optimal interval between middle cerebral artery (MCA) Doppler measurements when monitoring pregnancies complicated by red cell alloimmunization. METHODS: Thirty-nine fetal blood samplings (FBS) performed on 24 pregnant women with red blood cell alloimmunization followed up using both MCA peak systolic velocity and time-averaged mean velocity measurements ...
Carvalho F H C - - 2006
OBJECTIVES: Investigate the prediction of birth acidemia in pregnancies with placental insufficiency using two newly created venous-arterial Doppler ratios: pulsatility index (PI) of the ductus venosus (DV) over PI of the middle cerebral artery (MCA) and PI of the DV over PI of the umbilical artery and establish cut-off values ...
Malcus Peter - - 2006
A 34-year-old healthy gravida 2 para 1 presented after an uncomplicated pregnancy at term with a 2-day history of diminished fetal movements. Fetal anemia was suspected by fetal heart rate monitoring and Doppler estimation of the fetal peak blood flow velocity of the middle cerebral artery. We were also fortunate ...
Schiessl Barbara - - 2006
AIMS: The decrease in uterine resistance during normal pregnancy is known to be related to invading trophoblast cells which derive from placental tissue. Uterine and peripheral resistance is elevated in preeclampsia. The aim of the present study was to prospectively examine uterine and peripheral resistance in pregnancies complicated by preeclampsia ...
Espinoza Jimmy - - 2006
This article reviews the anatomy and physiology of the uterine circulation, with emphasis on the remodeling of spiral arteries during normal pregnancy, and the timing and anatomical pathways of trophoblast invasion of the spiral arteries. We review the definitions of the placental bed and basal plate of the placenta, their ...
Muller Peter R PR Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Duke University Medical Center, Durham, North Carolina, USA. - - 2006
Circulating angiogenic growth factors (such as vascular endothelial growth factor [VEGF] and placental growth factor [PlGF]) and their interaction may be associated with vascular remodeling of spiral arteries in normal pregnancy. Soluble Flt-1, an antagonist of both VEGF and PlGF, has been shown to be increased, while PlGF is decreased ...
Erkinaro T - - 2006
BACKGROUND: We hypothesized that ephedrine and phenylephrine are equal with respect to uterine and placental haemodynamics and fetal acid-base status after exposure to maternal hypoxaemia and hypotension in a chronic sheep model of increased placental vascular resistance (R(UA)). METHODS: At 114-135 days gestation, chronically instrumented fetal sheep underwent placental embolization ...
Onalan Reside - - 2006
AIM: To evaluate the efficacy of a combined 2nd-trimester maternal serum homocysteine and uterine artery Doppler screening at 20 weeks of gestation for complications of pregnancy: preeclampsia, isolated intrauterine growth restriction (IUGR), placental abruption, and stillbirths. METHODS: Consecutive singleton pregnancies without previous risk factors who had homocysteine measured as part ...
Bergersen T K - - 2006
We used a longitudinal study design (gestational weeks 8, 15, 22, 29, and 36 and 12 wk postpartum ) to investigate the effect of normal pregnancy on cerebral autoregulation and pressor response. Blood flow velocities in the right internal carotid artery, end-tidal CO2, and mean arterial pressure (MAP) were simultaneously ...
Carvalho Francisco Herlânio Costa - - 2005
OBJECTIVES: To evaluate the prediction of acidemia at birth using ductus venosus Doppler velocimetry and to determine the best parameter and cut-off values for this prediction in pregnancies complicated with placental insufficiency. METHODS: Prospective cross-sectional study. Forty-seven patients with placental insufficiency managed in two Brazilian hospitals were submitted to ductus ...
Mills T A - - 2005
BACKGROUND: In fetal growth restriction (FGR) abnormal umbilical artery (UA) Doppler waveform indices suggest increased vascular resistance and impaired placental blood flow. This study aimed to determine whether UA Doppler waveform indices were related to the vasoreactivity of placental chorionic plate small arteries in normal and FGR pregnancies. MATERIALS AND ...
Biggio Joseph R JR - - 2005
PURPOSE OF REVIEW: Traditional methods of fetal evaluation require invasive procedures (e.g. amniocentesis) with an inherent, albeit low, risk of complications and pregnancy loss. As medical knowledge and ultrasound technology have advanced, noninvasive modes of fetal evaluation have become increasingly used. Two disorders in which this has been most applied ...
Loughhead Ada M - - 2006
BACKGROUND: The use of antidepressants during pregnancy continues to garner considerable attention, though there are limited investigations that have sought to quantify fetal exposure. METHODS: Maternal and umbilical cord sera were collected at delivery from ten women taking nortriptyline and seven taking clomipramine. Placental passage was calculated as the ratio ...
Predanic Mladen - - 2005
OBJECTIVE: The purpose of this study was to evaluate a relationship between the umbilical cord thickness and cord coiling patterns during the fetal sonographic anatomic survey in the second trimester of pregnancy. METHODS: This was a prospective study of 470 patients with singleton pregnancies who had a fetal anatomic survey ...
Baschat Ahmet Alexander - - 2005
Key issues in the management of early onset fetal growth restriction (IUGR<34 weeks) are accurate diagnosis and assessment of fetal well-being to optimize timing of delivery by weighing fetal vs. neonatal risks. Cardiovascular, behavioral and fetal heart rate patterns in IUGR follow a predictable progression that corresponds with the severity ...
Wong Geoffrey - - 2005
OBJECTIVE: This series reports 3 cases with conflicting antenatal sonographic findings: intrauterine growth restriction, absent or reversed end-diastolic flow in umbilical artery Doppler imaging, and reassuring biophysical test results. METHODS: We conducted a retrospective review of medical records. RESULTS: Three fetuses had intrauterine growth restriction and absent or reversed end-diastolic ...
Vainio Merja - - 2005
OBJECTIVE: To assess the value of transvaginal uterine artery Doppler ultrasound at 12--14 weeks of gestation in predicting hypertensive disorders of pregnancy in high-risk women. METHODS: One hundred and twenty high-risk women were evaluated prospectively by Doppler ultrasound of uterine and umbilical arteries at 12--14 weeks of gestation. The presence ...
Park Yong Won - - 2005
We performed this study to evaluate uterine artery Doppler velocimetry (UADV) measurement of unilateral or bilateral abnormalities as a predictor of complications in pregnancy during the mid-second trimester (20-24 weeks). We enrolled 1,090 pregnant women who had undergone UADV twice: once between the 20th and 24th week (1st stage) and ...
Le Thi Huong D - - 2006
OBJECTIVE: To examine the predictive value of clinical examination, laboratory tests and Doppler ultrasound examination in systemic lupus erythematosus (SLE) and/or antiphospholipid syndrome (APS) pregnancies. METHODS: A prospective study of 116 pregnancies followed in a single tertiary referral centre. Outcomes analysed were fetal/neonatal death and adverse pregnancy outcome. Univariate analysis ...
Brusati Valentina - - 2005
The objective of the present investigation was to determine fetal and maternal plasma concentrations of nonglucose carbohydrates and polyols in normal human pregnancies at term. Uncomplicated human pregnancies (n = 50) were studied at > or =37 wk gestation. Blood samples were obtained from umbilical artery, umbilical vein, and maternal ...
Merce Luis Tadeo - - 2005
AIM: To describe the evolution of placental vascularization during a normal course of gestation and the blood flow 3D power Doppler indices obtained by "placental vascular biopsy." METHODS: A prospective study was carried out on 99 normal singleton pregnancies from 14 to 40 weeks. Placental vascularization was evaluated by 3D ...
Simchen M J - - 2005
OBJECTIVE: One hundred percent oxygen is given in pregnancy to improve fetal oxygenation, yet has been shown in both animal and human studies ex utero to increase cerebral vascular resistance. Adjusting end-tidal pCO2 (ET-pCO2) levels to normocapnic levels during hyperoxygenation offsets this effect in non-pregnant individuals. We aimed to evaluate ...
Gómez O - - 2005
OBJECTIVES: To establish reference values for the first-trimester uterine artery (UtA) pulsatility index (PI) and to investigate the role of UtA Doppler in the early prediction of hypertensive disorders and their associated complications in an unselected Mediterranean population. METHODS: A prospective study including 1091 consecutive singleton pregnancies undergoing routine early ...
Spencer Kevin - - 2005
BACKGROUND: Previous studies have shown an association between low first trimester maternal serum free beta-hCG and PAPP-A and subsequent development of pregnancy complications. Similarly, uterine artery Doppler in the late second trimester has shown that high impedance to flow is associated with increased risk for preeclampsia and fetal growth restriction. ...
Rouget C - - 2006
Preeclampsia, which complicates 3-8% of pregnancies, is one of the leading causes of neonatal morbidity and mortality. Its pathophysiology remains unclear. The aim of the present study was to investigate the presence and the role of beta2- and beta2-adrenergic receptors (ADRB2 and ADRB3, respectively) in human placental arteries and to ...
Saravanan V - - 2005
The bed expansion characteristics of a fluidized bed containing bacterial granules have been studied. These biogranules were obtained from an anaerobic hybrid reactor, which uses biogranules (without carrier particle) in fluidized condition. The settling velocity study of biogranules has shown that the drag coefficient of biogranule is greater than that ...
Lam H - - 2005
BACKGROUND: This prospective observational study aims at determining the distribution of fetal cerebro-placental Doppler indices and amniotic fluid volume in a homogenous group of uncomplicated postdated pregnancies at 41 weeks. The correlation with incidence of passage of thick meconium-stained liquor in labor was analyzed to decide which parameter would be ...
Chaddha Vandana - - 2005
OBJECTIVE: The purpose of this study was to determine the fetal response to submaximal maternal exercise at 22 to 26 weeks in pregnancies with abnormal uterine artery Doppler. STUDY DESIGN: This was a prospective comparison of singleton pregnancies with uteroplacental vascular insufficiency (UPVI) (mean uterine pulsatility index [PI] values >1.45 ...
van der Heijden Olivier W H - - 2005
During pregnancy, the lumenal diameter and wall mass of the uterine artery (UA) increase, most likely in response to the increased hemodynamic strain resulting from the chronically elevated uterine blood flow (UBF). In this remodeling process, the phenotype of vascular smooth-muscle cells (VSMC) is transiently altered to enable VSMC proliferation. ...
Barkehall-Thomas Andrea - - 2005
AIM: The aim of this study is to review the clinical usefulness of Doppler velocimetry of the uterine artery for the detection of adverse obstetric outcome in a population of women with elevated mid-trimester serum beta-human chorionic gonadotrophin (betahCG). METHODS: Women with an unexplained elevated mid-trimester betahCG level (> or ...
Predanic Mladen - - 2005
OBJECTIVE: The purpose of this study was to evaluate the antenatal umbilical cord coiling index obtained during the fetal anatomic survey in the second trimester as a predictor of adverse pregnancy outcome. STUDY DESIGN: Four hundred twenty-five consecutive women who had a fetal anatomic survey between 18 to 23 weeks ...
Gadelha Da Costa Antonio - - 2005
The objective of our study was to assess fetal hemodynamics by Doppler velocimetry during the second half of pregnancy. We carried out a longitudinal study on 33 normal fetuses between the 22nd and 38th weeks of gestation. Doppler velocimetry was performed in the aorta, suprarenal (SRA) and infrarenal (IRA) segments, ...
Ajne G - - 2005
OBJECTIVE: The aim of this study was to determine the physiologic role for endogenous endothelin in the regulation of vascular tone during normal pregnancy and preeclampsia. The vascular sensitivity to endothelin-1 during pregnancy was studied also. STUDY DESIGN: Forearm blood flow was measured by venous occlusion plethysmography during intra-arterial infusion ...
Andaluz A - - 2005
The objective of this study was to determine the effects of propofol (PRF) on maternal and fetal cardiopulmonary function during the last trimester of pregnancy. Six pregnant 2-3 year-old Ripollesa sheep, each weighing 78+/-8 kg were used in the study and prepared by placing catheters in the maternal jugular vein ...
Ellis Cameron - - 2005
BACKGROUND: Absent or reversed end-diastolic flow velocity (ARED) in the umbilical arteries is typically associated with severe intrauterine growth restriction (IUGR), although there may be other causes, such as aneuploidy. CASE: A healthy 30-year-old gravida 2, para 0 woman with an uneventful pregnancy and normal prenatal screening test results presented ...
Albrecht E D - - 2006
The present study determined whether estrogen plays a role in regulating invasion and remodeling of the uterine spiral arteries by extravillous trophoblasts during early baboon pregnancy. The level of trophoblast invasion of spiral arteries was assessed on day 60 of gestation (term is 184 days) in baboons untreated or treated ...
Tongprasert Fuanglada - - 2005
OBJECTIVE: To describe the experience of the first 50 cases of cordocentesis after practicing with cordocentesis model. MATERIAL AND METHOD: Cordocentesis model consisted of a water-filled transparent glass box covered with a rubber latex sheet with or without piece of pork skin. A 30-cm umbilical cord filled with mercurochrome, hung ...
Hartung J - - 2005
OBJECTIVE: To describe the course and outcome of fetuses with absent or reversed end-diastolic (ARED) flow in the umbilical artery (UA) and to examine the influence of prematurity according to gestational age at delivery. METHODS: Sixty pregnancies complicated by ARED flow in the UA were monitored by repeat Doppler measurements ...
Willcox Timothy W - - 2005
Cardiopulmonary bypass (CPB) during pregnancy is associated with a maternal mortality similar to the nonpregnant population; however, fetal morbidity and mortality are high. Various strategies to improve fetal survival have been advocated. Alteration in uterine artery flow velocity has been reported during nonpulsatile CPB; however, roller pump-generated pulsatile flow for ...
< 3 4 5 6 7 8 9 10 11 12 13 >