Abstract:
OBJECTIVE:To use magnetic resonance images of living women and 3-dimensional modeling software to identify the component parts and characteristic features of the external anal sphincter (EAS) that have visible separation or varying origins and insertions. METHODS:Detailed structural analysis of anal sphincter anatomy was performed on 3 pelvic magnetic resonance imaging (MRI) data sets selected for image clarity from ongoing studies involving nulliparous women. The relationships of anal sphincter structures seen in axial, sagittal, and coronal planes were examined using the 3-D Slicer 2.1b1 software program. The following were requirements for sphincter elements to be considered separate: 1) a clear and consistently visible separation or 2) a different origin or insertion. The characteristic features identified in this way were then evaluated in images from an additional 50 nulliparas for the frequency of feature visibility. RESULTS:There were 3 components of the EAS that met criteria as being "separate" structures. The main body (EAS-M) is separated from the subcutaneous external anal sphincter (SQ-EAS) by a clear division that could be observed in all (100%) of the MRI scans reviewed. The wing-shaped end (EAS-W) has fibers that do not cross the midline ventrally, but have lateral origins near the ischiopubic ramus. This EAS-W component was visible in 76% of the nulliparas reviewed. CONCLUSION:Three distinct external anal sphincter components can be identified by MRI in the majority of nulliparous women.
journal_name
Obstet Gynecoljournal_title
Obstetrics and gynecologyauthors
Hsu Y,Fenner DE,Weadock WJ,DeLancey JOdoi
10.1097/01.AOG.0000189084.82449.fcsubject
Has Abstractpub_date
2005-12-01 00:00:00pages
1259-65issue
6eissn
0029-7844issn
1873-233Xpii
106/6/1259journal_volume
106pub_type
杂志文章abstract:OBJECTIVE:To compare blood loss, operative time, postoperative pain medication requirements, and complication rates in patients undergoing vaginal hysterectomy who were randomly assigned to receive preoperative intracervical vasopressin or no intracervical injection. METHODS:Fifty-eight women undergoing vaginal hyster...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,随机对照试验
doi:10.1097/AOG.0b013e3181954c44
更新日期:2009-02-01 00:00:00
abstract::Dating of maturity of the endometrium by histologic examination was correlated with four methods of ovulation detection in 13 cycling parous women. Histologic dating was assessed independently by two pathologists and correlated with the postovulatory duration as determined by daily transvaginal ultrasound scanning, se...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1989-01-01 00:00:00
abstract:OBJECTIVE:To estimate the incidence, mortality, and risk factors for pregnancy-related stroke in the United States. METHODS:The Nationwide Inpatient Sample from the Healthcare Cost and Utilization Project of the Agency for Healthcare Research and Quality, for the years 2000-2001 was queried for International Classific...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/01.AOG.0000172428.78411.b0
更新日期:2005-09-01 00:00:00
abstract:OBJECTIVE:The effect of exogenous hormones on the incidence of breast cancer has been extensively studied. Most studies regarding hormonal contraception have focused on combined oral contraceptives, and there is paucity of literature regarding nonoral and progestin-only contraceptives. The present study analyzed the re...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/01.AOG.0000178754.88912.b9
更新日期:2005-10-01 00:00:00
abstract::A rabbit serum fraction was prepared which contained antibody specific for unique antigen(s) found in human condylomata acuminata tissue but not in other human papillomatous or normal tissues. Indirect immunofluorescent staining of cryostat sections of human tissues demonstrated an intense nuclear fluorescence in cell...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1981-03-01 00:00:00
abstract:OBJECTIVE:To test the hypothesis that maternal oral hydration would increase the amniotic fluid (AF) index in pregnancies with normal AF. METHODS:Forty women with a normal AF index (7.0-24.0 cm) were randomized to either the control or hydration group. Women in the hydration group drank 2 L of water and returned for t...
journal_title:Obstetrics and gynecology
pub_type: 临床试验,杂志文章,随机对照试验
doi:
更新日期:1993-01-01 00:00:00
abstract::The circulating level of ACTH (by radioimmunoassay) and cortisol (by competitive protein binding) were determined at 1- to 2-hour intervals during spontaneous labor (N=8) and induced labor (N=28) and after delivery. There were no differences in ACTH levels between primiparous and multiparous women. The primiparous wom...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1975-09-01 00:00:00
abstract::Internal FHR tracings of 259 patients with variable decelerations and 49 with late decelerations were analyzed for frequency and severity of the pattern in an attempt to correlate with fetal pH or Apgar score at 1 minute. A significant increase in the risk of fetal acidosis was associated with a frequency of greater t...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1978-06-01 00:00:00
abstract:OBJECTIVE:To evaluate the sexual and reproductive health characteristics of women in treatment for opioid use disorder in Michigan and explore services provided and desired. METHODS:We conducted a cross-sectional study of female patients aged 18-50 years who accessed opioid use disorder treatment at 22 randomly select...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0000000000003666
更新日期:2020-02-01 00:00:00
abstract:OBJECTIVE:To analyze the origins and consequences of cases of brachial plexus injuries and their relationship to shoulder dystocia. METHODS:We conducted a retrospective cohort study and identified all neonates with brachial plexus injury delivered at our institution between March 2012 and July 2019. A review was perfo...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0000000000004013
更新日期:2020-10-01 00:00:00
abstract:OBJECTIVE:To assess the efficacy and safety of an oral formulation of tranexamic acid for the treatment of heavy menstrual bleeding. METHODS:Adult women with heavy menstrual bleeding (mean menstrual blood loss 80 mL or more per cycle) were enrolled in a double-blind, placebo-controlled study. After two pretreatment me...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1097/AOG.0b013e3181f20177
更新日期:2010-10-01 00:00:00
abstract:OBJECTIVE:To describe a pilot implementation of couple's human immunodeficiency virus (HIV) testing and counseling in an antenatal care clinic in the United States. METHODS:We used a cross-sectional study design. Couples were recruited from an antenatal care clinic of a large, urban, tertiary medical center, and were ...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0000000000003932
更新日期:2020-09-01 00:00:00
abstract:OBJECTIVE:To examine 2009 H1N1 influenza illness severity and the effect of antiviral treatment on the severity of illness among pregnant women. METHODS:We abstracted medical records from hospitalized pregnant (n=62) and nonpregnant (n=74) women with laboratory-confirmed 2009 H1N1 influenza in New York City, May throu...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0b013e3181d57947
更新日期:2010-04-01 00:00:00
abstract:OBJECTIVE:To determine whether the risk for uterine rupture is increased in women attempting vaginal birth after multiple cesarean deliveries. METHODS:We conducted a prospective multicenter observational study of women with prior cesarean delivery undergoing trial of labor and elective repeat operation. Maternal and p...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,多中心研究
doi:10.1097/01.AOG.0000224694.32531.f3
更新日期:2006-07-01 00:00:00
abstract::Although surgical management of symptomatic pelvic organ prolapse (POP) is common and often necessary, conservative treatments such as pessaries, pelvic floor muscle training, or both can usually result in symptomatic improvement. When treating patients with POP, health care practitioners should focus primarily on ide...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,评审
doi:10.1097/AOG.0b013e31824c0806
更新日期:2012-04-01 00:00:00
abstract:OBJECTIVE:To quantify the risk of residual invasion when cervical conization reveals microinvasive squamous carcinoma and to determine whether any factors affect this risk. METHODS:We reviewed the charts and histopathology slides of 87 women who underwent a conization that contained microinvasive squamous carcinoma, f...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0029-7844(97)00414-6
更新日期:1997-11-01 00:00:00
abstract:BACKGROUND:Postpartum uterine scar dehiscence is a rare but potentially lethal complication of cesarean deliveries. CASE:Concurrent abdominal and uterine dehiscences after cesarean delivery for arrest of descent with chorioamnionitis occurred in a 16-year-old patient after her first delivery. The uterine and fascia in...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0b013e31821619e9
更新日期:2011-08-01 00:00:00
abstract::One hundred sixty-three cases of endometriosis of the bowel (5.4% of 3037 laparotomies for endometriosis at the Ochsner Foundation Hospital) were reviewed to assess the management of this complication. Colon and rectal surgeons performed bowel resections of the colon in 30 cases and resections of the ileum and/or cecu...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1987-05-01 00:00:00
abstract::The hospital-based alternative birth room has become a popular alternative to the conventional labor and delivery room setting. Responses to a mailed questionnaire from 78 of 82 (95%) Washington State hospitals with obstetric services were used to relate available birth options to alternative birth room status and obs...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1981-11-01 00:00:00
abstract::Aggressive surgery may improve the outcome of patients with ovarian cancer. To assess the risk of operative complications, we analyzed 472 primary and 299 repeat operations for ovarian cancer in 536 women between 14-91 years of age. Intraoperative bleeding estimated to be over 1000 mL (N = 107) was more common after p...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1992-02-01 00:00:00
abstract::Twenty nonpregnant women with condylomata acuminata of the vagina were studied to assess the effectiveness of weekly topical 5-fluorouracil application. All patients were instructed to insert an applicator one-third full of 5% 5-fluorouracil cream (approximately 1.5 g) deeply into the vagina at bedtime once each week ...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1987-07-01 00:00:00
abstract::The outcome of delivery of infants weighing more than 4000 g born during two time periods 15 years apart was studied retrospectively. The increased use of cesarean section and other obstetric advances did not reduce the risk of fetal asphyxia and trauma associated with large fetal size. Maternal factors were identifie...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1983-06-01 00:00:00
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journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1993-08-01 00:00:00
abstract:OBJECTIVE:To examine whether a first abortion increases risk of mental health disorders compared with a first childbirth with and without considering prepregnancy mental health and adverse exposures, childhood economic status, miscarriage history, age at first abortion or childbirth, and race or ethnicity. METHODS:A c...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0000000000000092
更新日期:2014-02-01 00:00:00
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journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0029-7844(01)01743-4
更新日期:2002-03-01 00:00:00
abstract::In some parts of Dade County, Florida, perinatal mortality rates have revealed serious problems in the delivery of health care to poor pregnant women. From 1982-1985, the reported perinatal mortality rates varied from 32-36 per 1000 live births, more than double the national average. Under the leadership of the Primar...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,收录出版
doi:
更新日期:1991-09-01 00:00:00
abstract::Pelvic organ prolapse (POP) is a common, benign condition in women. For many women it can cause vaginal bulge and pressure, voiding dysfunction, defecatory dysfunction, and sexual dysfunction, which may adversely affect quality of life. Women in the United States have a 13% lifetime risk of undergoing surgery for POP ...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0000000000003520
更新日期:2019-11-01 00:00:00
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journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0029-7844(01)01560-5
更新日期:2001-11-01 00:00:00
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journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0029-7844(02)02185-3
更新日期:2002-10-01 00:00:00
abstract::The value of the contraction stress test (CST), although well documented in late pregnancy, has been questioned earlier in gestation. We have evaluated the reliability of the CST in 102 patients tested before 33 weeks' gestation. Eighteen patients with a positive CST had a significantly higher incidence of abnormal ur...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1978-12-01 00:00:00