Search Results
Results 451 - 500 of 946
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Zaidi J - - 1995
Uterine artery blood flow was assessed by transvaginal colour and pulsed Doppler ultrasound prospectively in six women during the peri-ovulatory period. All patients had regular ovulatory menstrual cycles and a mid-luteal serum progesterone consistent with spontaneous ovulation in the preceding cycle. Each patient underwent serial transvaginal ultrasound examination and Doppler ...
Bonilla-Musoles F - - 1995
We used transvaginal color Doppler sonography to study uterine artery blood flow velocity waveforms in 345 normal postmenopausal women who had never been on hormone replacement therapy. Our objective was to establish the standard baseline flow values for normal postmenopausal women. The mean pulsatility index was 3.38 +/- 1.04 and ...
Bonilla-Musoles F - - 1995
We used transvaginal color Doppler sonography to study the effect of hormone replacement on the uterine arterial blood flow for 203 postmenopausal women. The regimens studied involved estrogen replacement alone, continuous combined estrogen and progestogen, and estrogen followed sequentially by combined estrogen-progestogen. The mean pulsatility index fell to 65% +/- ...
Tekay A - - 1995
Nine in vitro fertilization (IVF) patients with moderate or severe ovarian hyperstimulation syndrome (OHSS) were recruited for a longitudinal study. Twenty-four unselected, asymptomatic patients undergoing similar IVF treatment were used as controls. OHSS was diagnosed 8-13 days after oocyte retrieval. All subjects were examined with pulsed color Doppler ultrasound. The ...
Zamudio S - - 1995
To determine whether uterine blood flow was reduced and indexes of pelvic blood flow distribution altered in normotensive pregnancy at high (3,100 m) compared with low altitude (1,600 m), we measured uterine, common iliac, and external iliac artery blood flow velocities and diameters in women during pregnancy and again postpartum. ...
Achiron R - - 1995
This study was conducted to evaluate endometrial blood flow characteristics in response to estrogen replacement therapy (ERT) and tamoxifen in asymptomatic postmenopausal women, and to correlate the resistance index (RI) with plasma estradiol levels. Transvaginal color Doppler ultrasound examinations were performed in 30 asymptomatic, postmenopausal women who demonstrated thin endometria ...
Deichert U - - 1995
The Doppler flow velocity wave forms originating from the common, external and internal iliac arteries of 20 healthy volunteers were recorded in order to find out if the arteries showed characteristic velocity wave forms. Further questions included whether these flow patterns changed during the ovarian cycle and whether differences between ...
Benbow A L - - 1995
This study examined the in vivo distribution and metabolism of maternal progesterone (P4) in the rat uterus at Day 16 of pregnancy, i.e., the time of maximal P4 secretion, and at Day 22, one day prior to parturition. Arterial and uterine venous blood samples were collected at 20-min intervals from ...
Zaidi J - - 1995
We investigated for the presence of circadian variation in uterine artery blood flow indices during the late follicular phase of the menstrual cycle. Twenty women with regular menstrual cycles underwent transvaginal color Doppler assessment of blood flow in the uterine arteries on two occasions precisely 12 h apart on the ...
Norris M C - - 1995
BACKGROUND AND OBJECTIVES: Bolus intravenous injection of epinephrine can decrease uterine blood flow. This study examined the effects of intravenous infusion of epinephrine on uterine blood flow in the gravid ewe. METHODS: Maternal and fetal vascular catheters and a maternal electromagnetic uterine artery flow probe were implanted in 10 near-term ...
Meuris S - - 1995
The purpose of this study was to investigate the temporal relationship between the early pregnancy peak of circulating human chorionic gonadotrophin (HCG) concentration and the establishment of maternal blood flow in the placental intervillous space. The presence of blood flow echoes within intervillous space was determined by colour Doppler imaging ...
Achiron R - - 1995
OBJECTIVE: To evaluate the endometrial blood flow response to hormone replacement therapy (HRT) in women with premature ovarian failure who plan to enter an oocyte donation program. DESIGN: Transvaginal color Doppler ultrasound examinations were performed in women with ovarian failure before and during a cycle of standard HRT and in ...
Tekay A - - 1995
The role of transvaginal pulsed colour Doppler ultrasound in the prediction of the outcome of in-vitro fertilization (IVF) therapy was assessed longitudinally in 30 patients during stimulated cycles. The pulsatility index (PI) of the uterine arteries did not change significantly until the mid-luteal phase. Within 6 days after the beginning ...
Zhang R S - - 1995
The H2 gas clearance technique was employed to measure uterine blood flow (UBF) in ovariectomized rats. A needle-type platinum electrode (125 microns diam) was inserted into the rat uterine wall to measure the tissue blood flow surrounding the electrode. The electrode can be placed in individual layers of the uterus ...
Steer C V - - 1995
In this study we assessed the variability of measuring uterine artery pulsatility index by colour Doppler ultrasound using different ultrasound transducers (abdominal 3 MHz, abdominal 5 MHz, endovaginal 5 MHz with and without a full bladder). We then assessed the intra-observer coefficient of variation for the different transducers and interobserver ...
Dowell R T - - 1995
Despite proven efficacy in interrupting uterine smooth muscle contraction for periods of 24-48 h, a recent clinical study concluded that the adrenergic beta-receptor agonist, ritodrine hydrochloride (Yutopar) had significant detrimental side effects. Our previous preclinical studies have shown that ritodrine reduces placental blood flow via a vascular steal phenomenon. Moreover, ...
Zaidi J - - 1995
A case of spontaneous luteinized unruptured follicle syndrome is presented with full documentation of hormonal, morphological and haemodynamic changes. Changes in uterine blood flow were also noted. Growth of the leading follicle was slow during the follicular phase of the cycle. After the luteinizing hormone (LH) surge, growth of the ...
Maymon R - - 1995
Transabdominal Doppler velocity waveform measurements of the uterine arteries during the third stage of labor were performed upon 25 patients with uncomplicated vaginal deliveries and 5 with prolonged third stage in order to further assess third-stage mechanisms. Based on Doppler flow measurements, three phases of the third stage of labor ...
Telfer J F - - 1995
The aim of this study was to investigate the presence of nitric oxide synthase (NOS) in human uterus. Tissues were obtained at operation from 10 women undergoing hysterectomy for benign disease. In-situ hybridization was used to determine the distribution of mRNA for NOS with a 483 bp digoxigenin-labelled antisense riboprobe. ...
Flam F - - 1995
Twenty-seven women with endometrial cancer were studied with Doppler ultrasound coupled with a vaginal probe. Pulsatility index of the flow velocity of the uterine artery was recorded and compared to that of a control group. The subjects and the controls did not differ in blood flow measurements. There was no ...
Binder N D - - 1995
In pregnancy, the maternal circulating renin-angiotensin system (RAS) and uteroplacental tissue RAS has been thought to support maternal placental flow by raising maternal arterial pressure or changing placental vascular resistance. Also, the placenta or uterus may alter maternal circulating RAS. Recent studies in the authors' laboratory using chronically catheterized rabbits ...
Jauniaux E - - 1994
Resistance index (RI) and pulsatility index (PI) in the uterine and spiral arteries, uterine artery peak systolic velocity and intervillous blood flow were recorded by transvaginal colour Doppler imaging in 30 missed abortions and 30 normal pregnancies matched for menstrual age. Pathological examination was performed in both groups within 24 ...
Creighton S - - 1994
The aim was to obtain data that could be used to determine the most appropriate treatment regimen for uterine fibroids with a gonadotropin releasing hormone analog (goserelin) before surgery. Fifteen premenopausal women (aged 27-53 years; mean 40 years) were referred from a gynecological outpatients' clinic. They all had uterine fibroids ...
Dickey R P - - 1994
Uterine artery blood flow measurements made solely in the recumbent position may miss physiological changes that occur while patients are upright. We evaluated the effect of standing on the minute blood flow volume of the ascending uterine artery, the pulsatility index (PI), resistance index (RI) and waveforms and on the ...
Halpern S - - 1994
The purpose of this study was to use colour Doppler to determine the effect of epidural anaesthesia on the uterine and umbilical blood flow velocities. After determining the precision of the technique, Doppler insonation of the uterine and umbilical arteries was performed in consenting non-labouring patients requesting epidural anaesthesia for ...
Alahuhta S - - 1994
The effects of two types of uterine displacement, on uterine and umbilical artery blood flow waveforms were investigated in 22 healthy parturients undergoing elective caesarean section. Displacement was accomplished with either a wedge under the right hip or a mechanical displacer plus 5 degrees left lateral tilt of the operating ...
Battaglia C - - 1994
Doppler ultrasound is a non-invasive technique for investigating artery blood flow variations. In 39 normoovulatory patients we investigated the correlation between bladder distension and uterine/ovarian blood flow resistance. The patients were scanned transabdominally or transvaginally both with full and emptied bladders. Pulsatility Index was significantly higher in patients with a ...
Akerlund M - - 1994
The anatomy of the human uterine vascular tree changes repeatedly with the variations in hormonal state during each menstrual cycle, with progressive differentiation of arterioles up to the premenstrual state. Hormonal factors also influence the innervation of uterine arteries, both cholinergic, adrenergic and peptidergic, and regulate the spontaneous contractile activity ...
Parratt J - - 1994
Uterine dystocia, often of unknown cause, remains one of the commonest causes of emergency caesarean section. We have tested the hypothesis that small acidic changes in pH, that can occur during labour contractions, can decrease contractions and contribute to dystocia. We simultaneously recorded intracellular pH (pHi) and force in human ...
Jauniaux E - - 1994
OBJECTIVE: To evaluate the relation between the development of the uteroplacental circulation as assessed by Doppler velocimetry and the maternal blood relaxin concentration. METHODS: Transvaginal color Doppler investigation of the uteroplacental circulation was performed in 42 healthy women at 6-15 weeks' gestation before termination of pregnancy for psychosocial reasons. The ...
Even M D - - 1994
The effects of location within the left or right uterine horn, position within each uterine horn, and fetal sex on fetal bodymass, blood flow to individual uterine segments associated with fetuses, and blood flow to the maternal portion of the placenta were investigated in rats. Sprague-Dawley rats were anaesthetized on ...
Grunewald C - - 1994
OBJECTIVE: To study the effects of low doses of the hormone atrial natriuretic peptide (ANP) on uteroplacental blood flow in patients with preeclampsia. METHODS: Eleven women with preeclampsia were infused intravenously with ANP (10 ng/kg/minute). Uteroplacental blood flow index was measured using dynamic placental scintigraphy with indium-113m. Regional blood flows ...
Tresukosol D - - 1994
We used the transvaginal ultrasound examination in women with abnormal uterine bleeding prior to conventional D&C. It is a simple, non-invasive technic, convenient and accepted by all patients. The endometrial thickness of less than 6 mm is compatible with atrophic endometrium, but of more than 17.7 mm will be malignancy. ...
Massa H M - - 1994
The effects of noradrenaline on the rates of secretion of ovarian progesterone and 20 alpha-hydroxypregn-4-en-3-one (20 alpha-OHP), blood flow and oxygen consumption were examined in rats on day 16 of pregnancy. A modified venous outflow technique was used to infuse noradrenaline directly into the ovary, without recirculation, and to monitor ...
Kublickiene K R - - 1994
The results of our previous studies suggested that endothelin-1 (ET-1) might be contributory to the impaired uteroplacental blood flow seen in preeclampsia. The aim of this study was to investigate the in vitro influence of isradipine on ET-1-induced contraction of myometrial resistance arteries from pregnant women, as these vessels are ...
Bulletti C - - 1994
OBJECTIVE: To determine endometrial changes throughout the menstrual cycle. DESIGN: Flow cytometric analysis of endometrial cells versus chronological dating. SETTING: Women volunteers with a normal menstrual cycle participated in this study that was done in an academic research environment. PATIENTS: Two hundred thirty regular menstruating women with adequate luteal phase ...
Aleem F - - 1994
Ovarian vascular Doppler is a promising screening test for early ovarian cancer detection. However, disagreements on flow indices used, flow signal shapes and ovarian vessel localization cause continuing controversy. We aimed at clarifying some of this confusion by directly measuring the adnexal arterial blood flow during laparotomy. A 10-MHz continuous ...
Wiltbank M C - - 1994
This article reviews literature on the highly differentiated nature of the luteal cell types and their regulation in the mid-cycle corpus luteum of ruminants. The blood vessels of the corpus luteum are composed primarily of endothelial cells with few intraluteal arterioles or arteries. Blood flow to the corpus luteum does ...
Reinsch R C - - 1994
OBJECTIVE: Our purpose was to examine the effects of RU 486 and leuprolide acetate on uterine artery blood flow and uterine volume. STUDY DESIGN: Patients were randomly assigned to group A (eight patients) receiving 25 mg of RU 486 daily for 3 months or group B (six patients) receiving 3.75 ...
Prada J A - - 1994
Recent studies from our laboratory in fasting pregnant ewes with twin gestation have implicated low serum calcium concentration in the etiology of hypertension in pregnancy. We hypothesized that the reduction in serum calcium concentration produced by feeding of a calcium-deficient diet in twin gestation would lead to a significant increase ...
Andrianakis P - - 1994
Uterine and umbilical blood flows were measured in pregnant sheep (125-142 days gestation) under normothermic and hyperthermic conditions using the Fick principle with [14C]antipyrine as the indicator. Exposure of the sheep to an ambient temperature of 43 +/- 1 degrees C (25-30% relative humidity) for 8 h increased maternal and ...
Dowell R T - - 1994
Pregnancies ending before 37 weeks gestation are the leading cause of infant morbidity and death. A recent study involving over 2,000 patients concluded that the beta-adrenergic agonist, ritodrine (Yutopar), the only tocolytic agent currently approved for clinical use, had no significant beneficial effect on perinatal mortality, the frequency of prolongation ...
Bourne T H - - 1994
There is sometimes a discrepancy between the apparent thickness of postmenopausal endometria, as determined by transvaginal ultrasonography, and the examination of endometrial biopsies. We describe a case which showed that tamoxifen (20 mg/day over 12 months) decreased impedance to blood flow in the uterine arteries and increased the apparent thickness ...
Dunlop C I - - 1994
The uterine hemodynamic response to maternal positioning in dorsal recombency was evaluated in 7 conscious pregnant cows during the third trimester. Anesthetic or sedative drugs were not administered. Uterine artery flow was measured, using a previously implanted ultrasonic flow probe. Catheters implanted in the uterine artery and vein were used ...
Zalud I - - 1993
The aim of our study was to assess the age and hormonal influence on endometrial and myometrial thickness and uterine blood flow in postmenopausal women. One hundred and nine healthy postmenopausal women were examined by transvaginal ultrasonography and color Doppler ultrasonography. Twenty women (18.4%) were under continuous HRT for at ...
Whitney E A - - 1993
OBJECTIVE: We tested the hypothesis that uterine blood flow is regulated by systemic circulating factors. The alternative hypothesis is that uterine blood flow is regulated by local factors. STUDY DESIGN: Adult female New Zealand White rabbits were subjected to a unilateral tubal ligation and thereafter allowed to become pregnant (n ...
Carter J - - 1993
The aim of this study was to evaluate the blood flow characteristics of the uterine artery and intratumoral vessels in patients with GTD. Twelve patients with GTD were evaluated with TVS, and 11 also had CFD sonography performed. Spectral analysis of both uterine artery and samples intratumoral and intramyometrial vessels ...
Akosa A B - - 1993
Necrotising granulomatous inflammation of the uterine corpus associated with transcervical laser ablation of the endometrium occurred in four patients. The abnormalities seen, including extensive necrosis and hyalinisation with foreign body giant cells containing black foreign material, and eosinophilic homogenisation around blood vessels, were due to the effects of tissue fulguration. ...
Magann E F - - 1993
The current study was undertaken to determine if blood loss at the time of cesarean section is affected by method of placental removal (spontaneous versus extracted) or uterine position for repair (in situ versus exteriorized). This prospective randomized study involved 100 women who were undergoing a cesarean section. The patients ...
Campbell S - - 1993
OBJECTIVE: To assess intrafollicular blood flow in relation to ovarian morphology and function during the periovulatory period. DESIGN: A prospective, longitudinal study of random, natural ovarian cycles. SETTING: The Ovarian Screening Clinic and Endocrine Laboratory of the Department of Obstetrics and Gynaecology, King's College Hospital, London, United Kingdom. PATIENTS: Women ...
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