Abstract:
OBJECTIVE:Our aim was to compare plasma drug levels in patients receiving ritodrine intravenously with those in patients receiving ritodrine orally at recommended dosages. STUDY DESIGN:Plasma samples from 20 pregnant patients treated with intravenous ritodrine (50 to 300 micrograms/min), 9 patients treated with oral ritodrine only (60 to 120 mg per 24 hours), and 9 patients treated first with intravenous and subsequently with oral ritodrine were analyzed for ritodrine concentration with the use of high-performance liquid chromatography. RESULTS:Average plasma ritodrine levels of patients receiving different intravenous dosages ranged from 27.8 +/- 3.5 to 113.3 +/- 38.8 ng/ml. Levels during oral therapy ranged between 9.8 +/- 3.2 and 13.8 +/- 4.4 ng/ml. In both modes of drug delivery, concentrations were significantly correlated with doses. In patients treated first with intravenous ritodrine and subsequently with the oral form, plasma concentrations during oral therapy averaged 27.7% +/- 18.8% of those obtained during intravenous infusion. CONCLUSION:Subtherapeutic plasma concentrations might be responsible for the failure to demonstrate clinical benefits of oral ritodrine in prevention of recurrent preterm labor. A twofold to threefold increase in the maximum recommended oral dosage of ritodrine should be considered, especially for patients who had previously required relatively high intravenous infusion rates (> 100 micrograms/min).
journal_name
Am J Obstet Gynecoljournal_title
American journal of obstetrics and gynecologyauthors
Schiff E,Sivan E,Terry S,Dulitzky M,Friedman SA,Mashiach S,Sibai BMdoi
10.1016/0002-9378(93)90054-msubject
Has Abstractpub_date
1993-10-01 00:00:00pages
1059-64issue
4eissn
0002-9378issn
1097-6868pii
0002-9378(93)90054-Mjournal_volume
169pub_type
杂志文章abstract::Progeny of women, whose thyroid function was studied gestationally, had psychological and/or neurologic examinations at 8 months, 4 years and 7 years of age. In more than 100 pregnancies (at least 3 per cent of total pregnancies) hypothyroxinemia occurred and was treated adequately or inadequately. Children were deliv...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1976-08-01 00:00:00
abstract:BACKGROUND:First-trimester ultrasound scans were introduced to China for nearly 20 years. The ability of first-trimester ultrasound screening to detect different malformations was variable. A recent systematic review concluded that the use of a standardized anatomic protocol was the most crucial factor to improve the s...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2020.10.037
更新日期:2020-10-27 00:00:00
abstract:OBJECTIVE:The purpose of this study was to examine whether women with gestational diabetes mellitus (GDM) and their offspring have reduced endothelial progenitor cell subsets and vascular reactivity. STUDY DESIGN:Women with GDM, healthy control subjects, and their infants participated. Maternal blood and cord blood we...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2010.10.913
更新日期:2011-03-01 00:00:00
abstract:OBJECTIVE:Our objective was to determine the localization of immunoreactive endothelin in human cyclic endometrium and in umbilical cord during normal delivery and after cesarean section. STUDY DESIGN:Fixed dated endometrial tissue (n = 41) and umbilical cord (n = 6) were subjected to immunohistochemistry with an anti...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(11)91652-4
更新日期:1992-07-01 00:00:00
abstract::A randomized prospective trial was performed to compare the efficacy and safety of ritodrine and indomethacin in the long-term treatment of preterm labor. Forty patients with intact membranes in preterm labor at 23 to 34 weeks' gestation were randomized to receive either intravenous ritodrine or oral indomethacin as t...
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(91)90569-d
更新日期:1991-04-01 00:00:00
abstract::Partial mole is distinguishable from complete mole with coexisting normal twin after delivery by DNA polymorphysm analysis. Our patient had chorionic villus sampling of a molar-appearing placenta with coexisting fetus at 12.3 weeks. Absent maternal alleles confirmed a diandrogenetic complete mole. Prenatal DNA diagnos...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1067/mob.2003.151
更新日期:2003-04-01 00:00:00
abstract::Transferrin receptors have been identified on the villous trophoblast of normal chorionic villi by immunohistochemical techniques. The current study investigated the expression of transferrin receptors on molar chorionic villi by using a monoclonal antibody in immunofluorescence assays. The villous trophoblast of mola...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(85)90438-7
更新日期:1985-01-01 00:00:00
abstract::Ultrasonographic determination of biparietal diameter/femur length ratios performed at 16 or 17 weeks' gestation in fetuses with trisomy 21 were not statistically different from those of 155 normal fetuses. It appears that this test could not be used for screening for trisomy 21. ...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(90)90636-l
更新日期:1990-11-01 00:00:00
abstract::Fifty-one patients with granulosa-cell tumors and nine patients with Sertoli-Leydig-cell tumors have been treated at the M. D. Anderson Hospital. The most important prognostic finding was the stage of the tumor when first seen. Conservative surgery was utilized in young patients with lesions confined to one ovary. Mor...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(76)90577-9
更新日期:1976-06-01 00:00:00
abstract:OBJECTIVE:We compared the diagnostic performances of fetal fibronectin assay of cervical and vaginal secretions and of transvaginal ultrasonographic evaluation of the uterine cervix in the prediction of preterm delivery of patients presenting with preterm labor and intact membranes. STUDY DESIGN:One hundred eight pati...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(96)70020-0
更新日期:1996-11-01 00:00:00
abstract::Serum progesterone was assayed by the competitive protein-binding technique in 20 cases of gestational choriocarcinoma and one case of nongestational choriocarcinoma. Serum human chorionic gonadotropin (HCG) was simultaneously measured from the same blood samples by the hemagglutination-inhibition technique. Serum pro...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(75)90503-7
更新日期:1975-12-01 00:00:00
abstract::The effect of progesterone on estrogen-induced uterine blood flow was investigated in repeated experiments in seven nonpregnant, oophorectomized ewes with chronically implanted electromagnetic flow probes and catheters inserted into branches of the uterine arteries. Administered alone, progesterone has no effect on ba...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(77)90617-2
更新日期:1977-06-01 00:00:00
abstract:OBJECTIVE:During early pregnancy fetal cytotrophoblast cells invade the uterus and penetrate the basement membrane, a property that is characteristic of malignant cells. However, unlike tumor invasion, trophoblast invasion of the uterus is under strict control. This control limits invasion, so that it primarily remains...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(94)90107-4
更新日期:1994-09-01 00:00:00
abstract:OBJECTIVE:The purpose of this study was to compare the effect of a single 48-hour exposure to betamethasone or dexamethasone in the NCI-H441 cell line and in human type II pneumocytes. STUDY DESIGN:NCI-H441 cells were exposed 48 hours to varying concentrations of betamethasone or dexamethasone (10(-10) to 10(-7) mol/L...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2004.01.015
更新日期:2004-04-01 00:00:00
abstract::There are no absolute objective diagnostic criteria for cervical incompetence. Abdominal and endovaginal ultrasonographic assessment of endocervical length, both of which have been associated with technical problems, have been used to establish the diagnosis. Cervical cerclage may be useful in preventing silent cervic...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(92)91358-h
更新日期:1992-03-01 00:00:00
abstract:OBJECTIVE:To compare the risk of fetal death (FD) between 34 and 41 weeks' gestational age (GA) with the neonatal mortality rate to examine the best GA for delivery. STUDY DESIGN:Linked birth and infant death data for the US from the National Center for Health Statistics analyzed nonanomalous singleton pregnancies bet...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2012.12.005
更新日期:2013-03-01 00:00:00
abstract::Progestogens are the first drugs to demonstrate reproducibly a reduction in the rate of early preterm birth. The efficacy and safety of progestogens are related to individual pharmacologic properties of each drug within this class of medication and characteristics of the population that is treated. The synthetic 17-hy...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章,评审
doi:10.1016/j.ajog.2015.10.934
更新日期:2016-01-01 00:00:00
abstract:OBJECTIVE:The purpose of this study was to define the rate of neoplasia in prophylactic surgical specimens with the use of a careful surgical and pathologic protocol in a prospective study of high-risk women who were undergoing risk-reducing salpingo-oophorectomy. Outcomes of interest were neoplasia that was identified...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2006.03.006
更新日期:2006-06-01 00:00:00
abstract::Although traditionally the exclusive domain of other medical specialties, pulmonary artery catheterization may be of tremendous benefit to a variety of obstetric and gynecologic patients. Our experience with such invasive hemodynamic monitoring in 72 patients in an obstetrics and gynecology service is presented. In 86...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(85)80145-9
更新日期:1985-06-15 00:00:00
abstract:OBJECTIVE:Our goal was to establish a reference range for the fetal crown-chin length at 10 to 14 weeks' gestation and to determine its usefulness in the prenatal detection of anencephaly in the first trimester. STUDY DESIGN:Women attending our center for transabdominal ultrasonographic screening at 10 to 14 weeks' ge...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(97)70610-0
更新日期:1997-04-01 00:00:00
abstract:OBJECTIVE:Our purpose was determine whether there are ethnic differences in vaginal colonization with organisms reputed to be associated with preterm delivery. STUDY DESIGN:In seven urban medical centers in the United States from 1984 to 1989, 13,747 predominantly low-socioeconomic-status women at 23 to 26 weeks' gest...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(96)70617-8
更新日期:1996-05-01 00:00:00
abstract::Trichomonas vaginalis, a common genital pathogen, was found to possess both specific estrogen and specific androgen receptors. These 4.3 S macromolecules were proteinaceous in nature. Both metronidazole-resistant and metronidazole-sensitive strains possessed both types of sex hormone-binding proteins. The estrogen rec...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(87)90122-0
更新日期:1987-05-01 00:00:00
abstract:OBJECTIVE:We studied ovarian cancers for the expression of membrane markers of hematopoietic origin. STUDY DESIGN:We used flow cytometry to systematically characterize the expression of more than 30 hematologic antigens on ovarian carcinoma cell lines and to assess their stability under estrogen exposure. The expressi...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2009.05.013
更新日期:2009-08-01 00:00:00
abstract::Seventeen human fetal and neonatal pituitary glands were removed at necropsy, and analyzed for oxytocin content by a specific and sensitive radioimmunoassay, after homogenization in 0.4M acetic acid. Serial dilution of the pituitary extract showed parallelism with the oxytocin standard curve on the radioimmunoassay. C...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(84)90719-1
更新日期:1984-02-15 00:00:00
abstract::We describe the preparation and usage of positive and negative quality control standards for the proline aminopeptidase assay of vaginal secretions as an indicator of bacterial vaginosis. ...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(89)80075-4
更新日期:1989-03-01 00:00:00
abstract:OBJECTIVE:The objective of this study was to determine whether indomethacin is associated with an increased incidence of constriction of the human fetal ductus arteriosus with advancing gestational age. STUDY DESIGN:A retrospective analysis of fetal echocardiograms performed in 44 patients with premature labor or hydr...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(11)90763-7
更新日期:1993-05-01 00:00:00
abstract::Over a 10-year period, 65 of 196 patients (33%) with ovarian epithelial malignancy, previously treated with chemotherapy, had a second-look operation if the disease was clinically absent. All procedures were done by one of three gynecologic oncologists, and 48% of the patients had a positive second-look procedure. Of ...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(87)80012-1
更新日期:1987-09-01 00:00:00
abstract::Serial hemodynamic investigations were performed in 10 women with twin pregnancies at 20, 24, 28, 32, and 36 weeks' gestation and at 6 months after delivery. Cardiac output was measured by Doppler and cross-sectional echocardiography at the aortic, pulmonary, and mitral valves. Cardiac chamber size and ventricular fun...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(89)90682-0
更新日期:1989-11-01 00:00:00
abstract::Two studies were performed to assess the effect of fat feeding on glucose tolerance before, during, and after gestation of BHE rats. In the first study 5% or 22% fat diets were fed from 3 weeks before mating until after gestation. In the second study, these diets were fed from weaning until 400 days of age. Glucose to...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(89)90272-x
更新日期:1989-07-01 00:00:00
abstract:OBJECTIVE:Postpartum infections are polymicrobial and typically include Ureaplasma, an intracellular microbe that is treated by macrolides such as azithromycin. The aim of this study was to evaluate the perinatal pharmacokinetics of azithromycin after a single preincision dose before cesarean delivery. STUDY DESIGN:Th...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ajog.2015.01.015
更新日期:2015-06-01 00:00:00