Abstract：
OBJECTIVES:The objectives of this study were to determine the mechanisms responsible for the initiation and the termination of episodes of circus movements and to describe the characteristics of these circuits in rat myometrium. STUDY DESIGN:By means of simultaneous recordings from 240 sites in Wistar rats at 17, 19, or 21 days' gestation, a spatial and temporal analysis was performed on the electrical activation from the beginning until the end of 22 episodes of circus movements. RESULTS:The initiation of reentry was caused by (1) transient unexcitable areas at the beginning of the burst or (2) lines of conduction blocks. Circus movements were terminated by (1) reversal of recruitment (decruitment) at the end of the burst, (2) occurrence of lines of conduction blocks, or (3) interruption of the circuit. On average circuits rotated for 6 revolutions during 2 seconds. In most cases circuits remained stable; sometimes circuits drifted along the tissue and occasionally multiple wavelets were seen instead of a single circuit. CONCLUSIONS:Spatial nonhomogeneities in conduction caused by transient unexcitable areas play a major role in both the initiation and the termination of episodes of circus movements in the pregnant rat myo-metrium. In addition, most circuits remained in a single location, although sometimes meandering or even fibrillatory activity was seen.
journal_name
Am J Obstet Gynecoljournal_title
American journal of obstetrics and gynecologyauthors
Lammers WJ,Hamid Rdoi
10.1016/s0002-9378(98)70018-3subject
Has Abstractpub_date
1998-12-01 00:00:00pages
1515-26issue
6 Pt 1eissn
0002-9378issn
1097-6868pii
S0002937898006504journal_volume
179pub_type
杂志文章abstract：:The presence and number of mast cells and their relationship to other inflammatory cells were investigated in smears from intrauterine contraceptive devices. The results obtained suggest a possible role of mast cells in the mechanism of action of intrauterine contraceptive devices, on the basis of the peculiar known f...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/s0002-9378(84)90446-0
更新日期：1984-04-15 00:00:00
abstract：OBJECTIVE:The purpose of this study was to establish normal ranges for human epididymis protein 4 (HE4) serum levels in healthy women. STUDY DESIGN:HE4 levels were measured in healthy women and analyzed by age, menopausal status, and pregnancy status. Upper 95th percentiles were determined for normal ranges. RESULTS:...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章,meta分析
doi：10.1016/j.ajog.2011.12.028
更新日期：2012-04-01 00:00:00
abstract：OBJECTIVE:We sought to investigate maternal and fetal nitroglycerin metabolization and to assess the clinical condition of neonates after intravenous nitroglycerin application during cesarean delivery. STUDY DESIGN:At the time of the uterine puncture incision, either 0. 25 mg or 0.5 mg nitroglycerin or a physiologic s...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/s0002-9378(00)70353-x
更新日期：2000-04-01 00:00:00
abstract：:Nifedipine, a dihydropyridone calcium entry blocker, has been used with increasing frequency in the treatment of preterm labor. We studied 66 patients in this prospective, randomized trial to evaluate the efficacy and maternal, fetal, and neonatal outcome associated with tocolysis with nifedipine or ritodrine. Deliver...
journal_title：American journal of obstetrics and gynecology
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1016/s0002-9378(11)90679-6
更新日期：1990-07-01 00:00:00
abstract：:Vulvodynia is chronic vulvar burning/pain without clear medical findings. The etiology of vulvodynia is unknown and health care professionals should thoroughly rule out specific, treatable causes or factors such as dermatoses or group B Streptococcus infections. Vulvodynia is divided into 2 classes: vulvar vestibuliti...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章,评审
doi：10.1067/s0002-9378(03)00790-7
更新日期：2003-09-01 00:00:00
abstract：OBJECTIVE:We sought to establish the lowest dose of 3-keto-desogestrel, when added to a copper-releasing intrauterine contraceptive device, that is needed to reduce menstrual blood loss to a very low level and to treat (essential) menorrhagia successfully. STUDY DESIGN:A double-blind group comparative study was design...
journal_title：American journal of obstetrics and gynecology
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1067/mob.2000.104805
更新日期：2000-03-01 00:00:00
abstract：:Blood volume (BV), plasma volume (PV), red cell volume (RCV), cardiac output (CO), and organ blood flows were measured in nonpregnant (Group I), 10 to 19 days' pregnant (Group II), and 20 to 30 days' pregnant (Group III) rabbits. BV, PV, and RCV increased throughout pregnancy, with maximum increase during the second t...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/s0002-9378(16)32982-9
更新日期：1979-11-01 00:00:00
abstract：:Evidence suggests an increased risk of ovarian cancer with asbestos exposure. Ovaries and corresponding fallopian tubes were studied by analytic electron microscopy. There was 71.4% agreement between tube and ovary for presence-type of asbestos. The fallopian tube can provide useful information regarding asbestos expo...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/s0002-9378(99)70559-4
更新日期：1999-08-01 00:00:00
abstract：OBJECTIVE:The purpose of this study was to assess whether vaginal sialidases level in early pregnancy is associated with preterm birth among women who are bacterial vaginosis-positive. STUDY DESIGN:Of the 1806 women who were enrolled at < 20 weeks of gestation, 800 of the women were bacterial vaginosis-positive (Nugen...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/j.ajog.2010.08.061
更新日期：2011-02-01 00:00:00
abstract：:Eighteen women aged 12 to 20 years with congenital cervicovaginal atresia were treated with a new technique of surgical canalization. All are now having regular menses. Two pregnancies have been achieved, with delivery of viable neonates. Surgical correction of this anomaly during adolescence may aid in restoration of...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1067/mob.2000.105740
更新日期：2000-08-01 00:00:00
abstract：OBJECTIVES:Our purpose was to determine whether blockade of inducible or endothelial nitric oxide synthesis prevents maternal vasodilation and blunting of angiotensin II responsiveness in the pregnant rat. STUDY DESIGN:Pregnant and nonpregnant rats were given (1) drinking water alone (untreated), (2) drinking water co...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/s0002-9378(97)70404-6
更新日期：1997-05-01 00:00:00
abstract：:The cellular localization of angiotensin II immunoreactivity and the presence of angiotensin II binding in rat ovaries were studied. Angiotensin II immunohistochemical staining was demonstrated throughout the corpora lutea of gonadotropin-stimulated immature rats and pseudopregnant adult rats, as well as in some strom...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/s0002-9378(88)80122-4
更新日期：1988-08-01 00:00:00
abstract：BACKGROUND:Limited published data exist detailing outcomes of donor embryo cycles. Patients and clinicians would benefit from information specific to donor embryo cycles to inform fertility treatment options, counselling, and clinical decision-making. OBJECTIVE:We sought to quantify trends in donor embryo cycles in th...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/j.ajog.2016.06.050
更新日期：2016-12-01 00:00:00
abstract：:Plasma amino acid analyses on 27 amino acids in serial samples from 15 pregnancies in 14 patients are reported. Variations of amino acid levels with gestational age are reported both for absolute amino acid levels and for levels normalized to total amino acids, with a t test used to determine which amino acids vary si...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/0002-9378(78)90108-4
更新日期：1978-07-01 00:00:00
abstract：OBJECTIVE:We sought to determine if treatment of periodontal disease during pregnancy with an alcohol-free antimicrobial mouth rinse containing cetylpyridinium chloride impacts the incidence of preterm birth (PTB) in a high-risk population. STUDY DESIGN:This single-blind clinical trial studied pregnant women (6-20 wee...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/j.ajog.2011.07.016
更新日期：2011-10-01 00:00:00
abstract：OBJECTIVE:This study was designed to investigate the effects of estrogen alone or combined with two different progestins, norethindrone or norgestimate, on bone density and compressive mechanical properties in an aged rat model. STUDY DESIGN:Twenty 11-month-old female Sprague-Dawley rats were sham operated (intact con...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/0002-9378(95)90638-x
更新日期：1995-11-01 00:00:00
abstract：:The objective of this study was to evaluate the impact of an interdisciplinary team-training program in obstetric emergencies on identifying unsupportive institutional policies and systems-based practices. We implemented a qualitative study design with a purposive sample of interdisciplinary physicians, nurses, and an...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/j.ajog.2011.02.022
更新日期：2011-10-01 00:00:00
abstract：OBJECTIVE:The purpose of this study was to examine the relationship between gestational age and outcomes of outborn versus inborn preterm infants. STUDY DESIGN:Multivariable logistic regression analysis was used to examine gestational age-specific, risk-adjusted outcomes of 2962 singleton infants who were born at <32 ...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1067/mob.2003.139
更新日期：2003-03-01 00:00:00
abstract：:To test the hypothesis that prostaglandins mediate the high incidence of postoperative pain in patients undergoing mechanical tubal occlusion, we studied the effect of premedication with a prostaglandin synthetase inhibitor in patients having Falope ring sterilization. Fifty-two women were randomly divided into two gr...
journal_title：American journal of obstetrics and gynecology
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1016/0002-9378(85)90006-7
更新日期：1985-01-15 00:00:00
abstract：:We analyzed interview and record review data from 9,823 deliveries to evaluate the relationship between prior history of induced abortion and subsequent late pregnancy outcomes. Complications such as bleeding in the first and third trimesters, abnormal presentations and premature rupture of the membranes, abruptio pla...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/0002-9378(83)91041-4
更新日期：1983-05-15 00:00:00
abstract：OBJECTIVE:This study was undertaken to establish the optimal threshold of birth weight discordance for prediction of adverse outcome in liveborn, non-malformed preterm twins. STUDY DESIGN:We accessed a cohort of twin gestations for the period 1990 through 2000 delivered at less than 37.0 weeks' gestation. Adverse neon...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/j.ajog.2004.05.053
更新日期：2004-10-01 00:00:00
abstract：OBJECTIVE:Heritable thrombophilias have been implicated as a potential cause of abruption by vascular disruption at the uteroplacental interface. Polymorphisms of the methylenetetrahydrofolate reductase (MTHFR) gene have been linked to vascular complications outside of pregnancy, which includes stroke. Given the underl...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章,多中心研究
doi：10.1016/j.ajog.2007.06.046
更新日期：2007-10-01 00:00:00
abstract：OBJECTIVE:The objective of the study was to test the null hypothesis that continuing vigorous weight-bearing exercise throughout pregnancy has no discernible long-term effect on indices of fitness and/or cardiovascular risk. STUDY DESIGN:This was a follow-up observational study of the fitness and cardiovascular risk p...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/j.ajog.2008.05.006
更新日期：2008-11-01 00:00:00
abstract：OBJECTIVE:We sought to estimate the risk of spontaneous preterm birth in parous women by use of obstetric history, fetal fibronectin, and sonographic cervical length. STUDY DESIGN:The probability of spontaneous preterm birth before 35 weeks' gestation was estimated from a logistic regression model with data from 1282 ...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/s0002-9378(98)70544-7
更新日期：1998-05-01 00:00:00
abstract：BACKGROUND:Although consensus guidelines on the management of cardiovascular disease in pregnancy reserve cesarean delivery for obstetric indications, there is a paucity of data to support this approach. OBJECTIVE:The objective of the study was to compare cardiovascular and obstetric morbidity in women with cardiovasc...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/j.ajog.2019.07.019
更新日期：2020-01-01 00:00:00
abstract：OBJECTIVE:The amount of bone mass and the tendency to fall are main risk factors for hip fractures and both deteriorate with advancing age. The dynamics between estrogen exposure and fracture protection seem too rapid to be explained by an effect on bone mass only. Postural balance function may be another potential mec...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/s0002-9378(97)70207-2
更新日期：1997-08-01 00:00:00
abstract：OBJECTIVE:Hemolytic disease of the fetus and newborn infant (HDFN) can be associated with bilirubin encephalopathy, which is usually averted through neonatal exchange transfusions (EXT). However, EXT can be associated with significant procedure-related morbidity. We hypothesized that maternal oral administration of phe...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/j.ajog.2004.08.016
更新日期：2005-02-01 00:00:00
abstract：:The ability of the calcium antagonist nifedipine to inhibit uterine contractions during labor and in the postpartum period was measured in the ewe. The hemodynamic effects of tocolytic doses of this drug were measured and compared with the hemodynamic effects of equivalent doses of ritodrine. Intravenous nifedipine wa...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/0002-9378(85)90397-7
更新日期：1985-04-15 00:00:00
abstract：:The relationship between low birth weight, intrauterine growth retardation, and preterm delivery in infants born at a perinatal center is described. Between 20% and 30% of infants born weighing 500 to 2000 gm and nearly 50% of infants born weighing 2001 to 2750 gm had intrauterine growth retardation. For infants withi...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/0002-9378(85)90543-5
更新日期：1985-08-15 00:00:00
abstract：OBJECTIVE:The purpose of this study was to assess self-reported side effects in women after they received the oral contraceptive (OC) and to compare discontinuation rates, according to presence or absence of side effects. STUDY DESIGN:The study comprised 1716 women aged <25 years who initiated the OC at 3 publicly fun...
journal_title：American journal of obstetrics and gynecology
pub_type： 杂志文章,多中心研究,随机对照试验
doi：10.1016/j.ajog.2006.12.015
更新日期：2007-04-01 00:00:00
