Abstract:
OBJECTIVE:To evaluate the power transmission, spot size, power density, and energy density of a new isotopic carbon dioxide (13CO2) laser compared with a conventional CO2 laser. METHODS:Experiments were performed in a laboratory using a conventional CO2 laser and an isotopic 13CO2 laser. Two laparoscopes with 5-mm and 7.5-mm operating channels were connected to a standard coupler and to each of the lasers. Standardized measurements were made of power transmission and spot size using both nitrogen purge gas and CO2 purge gas at rates of 1-20 L/minute. Power density and energy density were calculated for continuous mode and ultrapulse mode transmission, respectively. RESULTS:The isotopic 13CO2 laser power transmission was higher and proportional to input power, while spot size was smaller compared with the conventional laser and was insensitive to power level or purge rate. Power density and energy density were markedly higher with the isotopic 13CO2 laser, reaching the threshold for complete ablation, and were much more predictable. The 7.5-mm operating channel generally had superior operating results compared with the 5-mm channel because of the smaller spot size and higher power transmission. CONCLUSIONS:The isotopic 13CO2 laser is associated with much higher power density and energy density capabilities than are conventional CO2 lasers. At surgery, we have noted less thermal injury, faster ablation, more precise and predictable tissue effects, and greater control of tissue effect with the isotopic 13CO2 laser than with other CO2 lasers. These results are attributed to the improved beam propagation through CO2 insufflation gas measured in the laboratory. Thermal injury can be varied according to the required surgical situation and can be kept to an absolute minimum at high-pulse energy.
journal_name
Obstet Gynecoljournal_title
Obstetrics and gynecologyauthors
Adamson GD,Reich H,Trost Dsubject
Has Abstractpub_date
1994-05-01 00:00:00pages
717-24issue
5 Pt 1eissn
0029-7844issn
1873-233Xjournal_volume
83pub_type
杂志文章abstract:OBJECTIVE:We sought to relate the risk of antepartum stillbirth to uterine artery Doppler flow velocimetry at 22-24 weeks. METHODS:Data were available from 30,519 unselected women from seven units in the UK who had uterine artery Doppler performed between 22 and 24 weeks of gestation. The risk of stillbirth (n=109) wa...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/01.AOG.0000248536.94919.e3
更新日期:2007-01-01 00:00:00
abstract::This article, for the "To the Point" series prepared by the Association of Professors of Gynecology and Obstetrics Undergraduate Medical Education Committee, supplies educators with a review of best practices regarding incorporation of the electronic medical record (EMR) into undergraduate medical education. The uniqu...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,评审
doi:10.1097/AOG.0000000000001004
更新日期:2015-09-01 00:00:00
abstract::Arteriovenous fistulae of the ovarian artery may develop after gynecologic surgery. A case that occurred 9 years after hysterectomy with bilateral oophorectomy is presented and discussed. It illustrates an unusual cause of left lower quadrant abdominal pain. Surgical removal of the ovarian arteriovenous fistula result...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1978-01-01 00:00:00
abstract:OBJECTIVE:To compare the contraceptive effectivenesses of a polyurethane condom and a standard latex condom. Secondary outcomes of interest were safety, functionality, discontinuation, and acceptability. METHODS:We randomized 901 couples to use either the polyurethane condom or a standard latex condom as their only fo...
journal_title:Obstetrics and gynecology
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1016/s0029-7844(02)02732-1
更新日期:2003-03-01 00:00:00
abstract::Levels of five antibiotics used in treating chorioamnionitis were measured in maternal and cord blood and placenta. Ampicillin provided the highest ratio of cord to maternal blood (0.71). Gentamicin was also relatively high in this respect and also had the highest placenta to maternal blood ratio (3.97). Based on thes...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1988-07-01 00:00:00
abstract::Over a 3-year period at the Long Beach Women's Hospital, where electronic FHR (fetal heart rate) monitoring was routine, there were 8622 live births, including 41 infants born with major congenital malformations. The neonatal death rate in these malformed infants was 44%; 17 were delivered by cesarean section, 11 of w...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1979-06-01 00:00:00
abstract::Fourteen cases of mixed mesodermal tumor of the ovary are presented. The actuarial survival of patients with these tumors was 2.5 months. Eighty-six percent of patients were stage III or IV at the time of diagnosis. The stromal or carcinomatous component of the tumor could not be correlated with survival. Both our two...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,评审
doi:
更新日期:1988-09-01 00:00:00
abstract::The first of a 2-part trial consisted of a double-blind randomized pilot study in which 4 groups of 10 patients near term received 1 of the following hormonal combinations in a vaginal gel 15 hours before surgical induction of labor: 1) prostaglandin F2 alpha (PGF2 alpha) and relaxin; 2) relaxin and estradiol; 3) estr...
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:1981-11-01 00:00:00
abstract:OBJECTIVE:Despite a change of fetal physiologic and biochemical functions with gestational age, stationary umbilical cord acid-base reference values are used as measures of obstetric care quality. The aim of this study was to assess the risk of low Apgar score relative to low pH when using stationary versus gestational...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0029-7844(03)00512-x
更新日期:2003-08-01 00:00:00
abstract:OBJECTIVE:To analyze the diagnostic accuracy and alteration in treatment planning from interinstitution (different institution) pathologic consultation. METHODS:We reviewed pathologic reports from 720 referred patients. The diagnosis rendered from a gynecologic pathologist was compared with the original diagnosis. Dis...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0029-7844(98)00032-5
更新日期:1998-05-01 00:00:00
abstract:OBJECTIVE:To test the hypothesis that increasing the intravenous fluid bolus volume at the time of epidural placement in women with narrow pulse pressure would reduce postepidural fetal heart rate (FHR) abnormalities, hypotension, and resuscitative obstetric interventions. METHODS:We performed a single-center randomiz...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,随机对照试验
doi:10.1097/AOG.0000000000002326
更新日期:2017-12-01 00:00:00
abstract::Understanding the importance of circumcision in the religious history of Western civilization provides an insight into why the surgical procedure is still so prevalent today. Circumcision appears as a motif in the religious literature of Western civilization throughout the ages. The history of the Jewish faith can be ...
journal_title:Obstetrics and gynecology
pub_type: 历史文章,杂志文章
doi:10.1097/00006250-197804000-00023
更新日期:1978-04-01 00:00:00
abstract:BACKGROUND:Placental abscess formation is rarely recognized prenatally. We present a case detected ultrasonographically that developed from a central line infection and caused recurrent maternal bacteremia. CASE:A young woman with a 21-week twin gestation presented with recurrent fevers. She had received treatment for...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/01.AOG.0000165268.09352.ed
更新日期:2006-02-01 00:00:00
abstract::Women who present with pain and bleeding in the first trimester are at risk for ectopic pregnancy, a life-threatening condition. Conditions that predispose a woman to ectopic pregnancy are damaged fallopian tubes from prior tubal surgery or previous pelvic infection, smoking, and conception using assisted reproduction...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,评审
doi:10.1097/01.AOG.0000198632.15229.be
更新日期:2006-02-01 00:00:00
abstract::Recent reports have suggested that focal hyperechoic abdominal masses detected during the second trimester may represent a normal variation in fetal intestinal development that is transient in nature and not associated with pathologic conditions. The patient described here had second-trimester ultrasonic findings of f...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1991-11-01 00:00:00
abstract::Human trafficking is a widespread problem with estimates ranging from 14,000 to 50,000 individuals trafficked into the United States annually. This hidden population involves the commercial sex industry, agriculture, factories, hotel and restaurant businesses, domestic workers, marriage brokers, and some adoption firm...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0b013e3182310d06
更新日期:2011-09-01 00:00:00
abstract:OBJECTIVE:We sought to examine the costs of transferring one through five embryos per in vitro fertilization cycle from each of three perspectives: society, the infertile couple, and the insurer. METHODS:Data from the 2003 Assisted Reproductive Technology Report was used to create Markov decision analytic models strat...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/01.AOG.0000230534.54078.b3
更新日期:2006-09-01 00:00:00
abstract:OBJECTIVE:To estimate the incidence of occult uterine sarcoma and leiomyosarcoma in hysterectomies for leiomyomas and the risk associated with their morcellation. METHODS:We conducted a population-based cohort study. All uterine sarcomas from 2006-2013 in an integrated health care system were identified. Age- and race...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0000000000001187
更新日期:2016-01-01 00:00:00
abstract:BACKGROUND:Pregnancy-induced hemolytic anemia is a rare maternal complication that occurs during pregnancy and resolves soon after delivery. The mechanism is unclear, and the disease is often referred to as unexplained hemolytic anemia associated with pregnancy. CASE:We report a case of life-threatening hemolytic anem...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/01.AOG.0000287292.74846.f2
更新日期:2008-02-01 00:00:00
abstract::Adverse outcomes, preventable or otherwise, are a reality of medical care. Most importantly, adverse events affect patients, but they also affect health care practitioners. Disclosing information about adverse events has benefits for the patient and the physician and, ideally, strengthens the patient-physician relatio...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0000000000001813
更新日期:2016-12-01 00:00:00
abstract:OBJECTIVE:To identify the relationship between maternal cigarette smoking and ultrasound-confirmed placenta previa. METHODS:A matched case-control design was used. Cases were drawn from the New England Medical Center and Cambridge Hospital from July 1992 through March 1994. Each case was delivered by cesarean after 24...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0029-7844(95)00471-8
更新日期:1996-05-01 00:00:00
abstract:BACKGROUND:Bleeding angiomyolipomas in pregnancy are rare but may be devastating and potentially fatal. In previous cases, most of these lesions have been managed with urgent nephrectomy or embolization. Only one other case report describes treating these lesions through conservative management and vaginal delivery. C...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/01.AOG.0000167392.59472.c3
更新日期:2006-02-01 00:00:00
abstract::A total of 410 colposcopic examinations were performed on 188 female cebus monkeys that were under study to determine the oncogenic potential of herpes simplex virus type 2 in this genus. A split-cone vaginal speculum was developed that permitted good observation of the vaginal cervix in the cebus monkey. The cervical...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1978-11-01 00:00:00
abstract:OBJECTIVE:To compare ondansetron with metoclopramide in the treatment of hyperemesis gravidarum. METHODS:We enrolled 160 women with hyperemesis gravidarum in a double-blind randomized trial. Participants were randomized to intravenous 4 mg ondansetron or 10 mg metoclopramide every 8 hours for 24 hours. Participants ke...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章,随机对照试验
doi:10.1097/AOG.0000000000000242
更新日期:2014-06-01 00:00:00
abstract::Exercise, defined as physical activity consisting of planned, structured, and repetitive bodily movements done to improve one or more components of physical fitness, is an essential element of a healthy lifestyle, and obstetrician-gynecologists and other obstetric care providers should encourage their patients to cont...
journal_title:Obstetrics and gynecology
pub_type: 共识发展会议,杂志文章
doi:10.1097/AOG.0000000000003772
更新日期:2020-04-01 00:00:00
abstract:OBJECTIVE:To compare the clinicopathologic prognosticators and survival of Asians and whites with corpus cancer. METHODS:Demographic, clinicopathologic, and survival data were obtained from the 1992-2001 Surveillance, Epidemiology, and End Results Program. Statistical analyses were performed by Kaplan-Meier methods an...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/01.AOG.0000195062.75199.7d
更新日期:2006-02-01 00:00:00
abstract:OBJECTIVE:To assess the associations between specific pregnancy complications and posttraumatic stress disorder based on neurobiologic and behavioral characteristics, using Michigan Medicaid claims data from 1994-1996. METHODS:Two thousand, two hundred nineteen female recipients of Michigan Medicaid who were of childb...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0029-7844(00)01097-8
更新日期:2001-01-01 00:00:00
abstract:OBJECTIVE:To evaluate the use of the Auto Suture Poly CS-57 disposable surgical stapler to determine if the device offers any advantages over suture closure of the uterus. METHODS:A matched case-control study design was used. Operative time, estimated blood loss, change in hematocrit, incidence of postoperative endome...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0029-7844(95)00438-6
更新日期:1996-03-01 00:00:00
abstract::Prenatal lead exposure has known adverse effects on maternal health and infant outcomes across a wide range of maternal blood lead levels. Adverse effects of lead exposure are being identified at lower levels of exposure than previously recognized in both children and adults. In 2010, the Centers for Disease Control a...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0b013e31826804e8
更新日期:2012-08-01 00:00:00
abstract:OBJECTIVE:To examine whether there are: 1) regional differences in three perinatal interventions that reflect active treatment among periviable gestations and 2) racial-ethnic differences in the receipt of these perinatal interventions after accounting for hospital region. METHODS:We conducted a retrospective study on...
journal_title:Obstetrics and gynecology
pub_type: 杂志文章
doi:10.1097/AOG.0000000000003747
更新日期:2020-04-01 00:00:00