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Vacuum Extraction (vacuum + extraction)

Distribution by Scientific Domains

Medical Sciences	80%

Selected Abstracts

Experimental study of a new shock pre-drying method for cotton fabrics

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, Issue 9 2007
I. Tarakç
Abstract This paper reveals a new method for drying of textiles with the combination of vacuum-extraction and convective drying methods. The new method provides an inconceivable fast drying due to the synergistic effect of heat energy and mechanical forces. During vacuum extraction, hot air or superheated steam was applied as suction in place of air at room temperature and named as shock pre-drying. Vacuum extraction and shock pre-drying of cotton woven fabrics were performed at several working speeds between 1 and 30 m min,1 and the drying effects were compared. It was observed that it was possible to obtain effective pre-drying in , s or less time with shock pre-drying method. The method's water removal efficiency mainly depends on working speed and hot air or superheated steam temperature. Copyright © 2006 John Wiley & Sons, Ltd. [source]

The risk of lower urinary tract symptoms five years after the first delivery,

NEUROUROLOGY AND URODYNAMICS, Issue 1 2002
Lars Viktrup
Abstract Aim of the study To estimate the prevalence and 5-year incidence of lower urinary tract symptoms (LUTS) after the first delivery and to evaluate the impact of pregnancy per se and delivery per se on long-lasting symptoms. Materials and methods A longitudinal cohort study of 305 primiparae questioned a few days, 3 months, and 5 years after their delivery. The questionnaire used was tested and validated, and the questions were formulated according to the definitions of the International Continence Society (ICS). Maternal, obstetric, and neonatal data concerning every delivery and objective data concerning surgeries during the observation period were obtained from the records. From the sample of 278 women (91%) who responded 5 years after their first delivery, three subpopulations were defined: 1) women without initial LUTS before or during the first pregnancy or during the puerperal period, 2) women with onset of LUTS during the first pregnancy, and 3) women with onset of LUTS during the first puerperium. The risk of LUTS 5 years after the first delivery was examined using bivariate analyses. The obstetric variables in the bivariate tests with a significant association with long-lasting urinary incontinence were entered into a multivariate logistic regression. Results The prevalence of stress and urge incontinence 5 years after first delivery was 30% and 15%, respectively, whereas the 5-year incidence was 19% and 11%, respectively. The prevalence of urgency, diurnal frequency, and nocturia 5 years after the first delivery was 18%, 24%, and 2%, respectively, whereas the 5-year incidence was 15%, 20%, and 0.5%, respectively. The prevalence of all LUTS except nocturia increased significantly during the 5 years of observation. The risk of long-lasting stress and urge incontinence was related to the onset and duration of the symptom after the first pregnancy and delivery in a dose-response,like manner. Vacuum extraction at the first delivery was used significantly more often in the group of women with onset of stress incontinence during the first puerperium, whereas an episiotomy at the first delivery was performed significantly more often in the group of women with onset of stress incontinence in the 5 years of observation. The prevalence of urgency and diurnal frequency 5 years after the first delivery was not increased in women with symptom onset during the first pregnancy or puerperium compared with those without such symptoms. The frequency of nocturia 5 years after the first delivery was too low for statistical analysis. Conclusion The first pregnancy and delivery may result in stress and urge incontinence 5 years later. Women with stress and urge incontinence 3 months after the first delivery have a very high risk of long-lasting symptoms. An episiotomy or a vacuum extraction at the first delivery seems to increase the risk. Subsequent childbearing or surgery seems without significant contribution. Long-lasting urgency, diurnal frequency, or nocturia cannot be predicted from onset during the first pregnancy or puerperium. Neurourol. Urodynam. 21:2,29, 2002. © 2002 Wiley-Liss, Inc. [source]

Experimental study of a new shock pre-drying method for cotton fabrics

The risk of lower urinary tract symptoms five years after the first delivery,

Role of a second stage partogram in predicting the outcome of normal labour

AUSTRALIAN AND NEW ZEALAND JOURNAL OF OBSTETRICS AND GYNAECOLOGY, Issue 2 2009
Jayati K. BASU
Background: Management of the second stage of labour is dictated by arbitrary time limits rather than true measures of progress. No partogram is available for second stage of labour. Objectives: To evaluate a partogram designed for use for the second stage of labour. Methods: This prospective cross-sectional analytical study included low-risk pregnant women with singleton fetuses with vertex presentations at term. From onset of the second stage, vaginal examinations were performed every 30 min until delivery. A scoring system developed by Sizer et al. was used based on station and position of fetal head. Scores were plotted on a second stage partogram and used to predict labour outcomes, such as duration of second stage and mode of delivery. Results: Of 79 women examined, 73 had spontaneous vaginal delivery. Of the remaining six, four required oxytocin infusion and other two required vacuum extraction. The median durations of the second stage of labour for primigravidas (n = 34) and multigravidas (n = 45) were 35 and 25 min, respectively. The median Sizer's partogram score at the onset of second stage was 4. Multiple regression analysis showed that the partogram score (r2 = 0.27) and gravidity (r2 = 0.10) were independent predictors of duration of the second stage. There was a significant association between second stage progress plotted to the right of the partogram line and non-spontaneous delivery (P = 0.01). Conclusion: The second stage partogram score at onset can predict the duration of second stage. Poor progress plotted on the partogram is associated with non-spontaneous delivery. [source]

U.S. Trends in Obstetric Procedures, 1990,2000

BIRTH, Issue 3 2002
Lola Jean Kozak PhD
ABSTRACT: Background: During the 1980s the rate of obstetric procedures performed during delivery rose precipitously. This study follows the use of obstetric procedures through the 1990s to explore whether the patterns witnessed in the previous decade continued through the next. Methods: Data on total obstetric procedures and eight specific procedures (cesarean section, medical and surgical induction of labor, other artificial rupture of membranes, episiotomy, repair of current obstetric laceration, vacuum extraction, forceps delivery) were obtained from the National Hospital Discharge Survey, a nationally representative survey of discharges from short-stay non-Federal hospitals. Approximately 32,000 records for women with deliveries were included in the survey each year. Results: The total rate of all obstetric procedures did not change significantly from 1990 through 2000. However, as during the 1980s, rates increased for induction of labor, vacuum extraction, and repair of current obstetric laceration. Rates decreased for forceps delivery and episiotomy, also continuing 1980s trends. After a long period of increase, the rate of cesarean section declined from 1988 to 1995 but increased again from 1995 to 2000. Conclusions: Unlike the 1980s, the overall rate of obstetric procedures did not increase from 1990 to 2000, but the mix of obstetric procedures performed continued to change during this period. (BIRTH 29:3 September2002) [source]

Prevalence and Persistence of Health Problems After Childbirth: Associations with Parity and Method of Birth

BIRTH, Issue 2 2002
Jane F. Thompson MSc
ABSTRACT: Background: Awareness about the extent of maternal physical and emotional health problems after childbirth is increasing, but few longitudinal studies examining their duration have been published. The aim of this study was to describe changes in the prevalence of maternal health problems in the 6 months after birth and their association with parity and method of birth. Methods: A population-based, cohort study was conducted in the Australian Capital Territory (ACT), Australia. The study population, comprising women who gave birth to a live baby from March to October 1997, completed 4 questionnaires on the fourth postpartum day, and at 8, 16, and 24 weeks postpartum. Outcome measures were self-reported health problems during each of the three 8-week postpartum periods up to 24 weeks. Results: A total of 1295 women participated, and 1193 (92%) completed the study. Health problems showing resolution between 8 and 24 weeks postpartum were exhaustion/extreme tiredness (60,49%), backache (53,45%), bowel problems (37,17%), lack of sleep/baby crying (30,15%), hemorrhoids (30,13%), perineal pain (22,4%), excessive/prolonged bleeding (20,2%), urinary incontinence (19,11%), mastitis (15,3%), and other urinary problems (5,3%). No significant changes occurred in the prevalence of frequent headaches or migraines, sexual problems, or depression over the 6 months. Adjusting for method of birth, primiparas were more likely than multiparas to report perineal pain and sexual problems. Compared with unassisted vaginal births, women who had cesarean sections reported more exhaustion, lack of sleep, and bowel problems; reported less perineal pain and urinary incontinence in the first 8 weeks; and were more likely to be readmitted to hospital within 8 weeks of the birth. Women with forceps or vacuum extraction reported more perineal pain and sexual problems than those with unassisted vaginal births after adjusting for parity, perineal trauma, and length of labor. Conclusions: Health problems commonly occurred after childbirth with some resolution over the 6 months postpartum. Some important differences in prevalence of health problems were evident when parity and method of birth were considered. (BIRTH 29:2 June 2002) [source]

Fear of childbirth according to parity, gestational age, and obstetric history

BJOG : AN INTERNATIONAL JOURNAL OF OBSTETRICS & GYNAECOLOGY, Issue 1 2009
H Rouhe
Objective, To examine fear of childbirth according to parity, gestational age, and obstetric history. Design, A questionnaire study. Population and setting, 1400 unselected pregnant women in outpatient maternity clinics of a university central hospital. Methods, Visual analogue scale (VAS) and Wijma Delivery Expectancy/Experience Questionnaire (W-DEQ) and preferred mode of delivery. Main outcome measures, W-DEQ and VAS scores according to parity, gestational age, obstetric history, and preferred mode of delivery. Results, The W-DEQ and VAS scores were higher in nulliparous (W-DEQ 72.0 ± 20.0 [mean ± SD] and VAS 4.7 [median]) than parous women (65.4 ± 21.9; 3.2, P < 0.001 for both W-DEQ and VAS). Higher W-DEQ and VAS scores were found for those beyond 21 weeks of gestation compared with those before (W-DEQ 71.6 ± 23.0 versus 66.6 ± 20.0, P < 0.001; VAS 4.7 versus 3.2, P < 0.001). Caesarean section was preferred mode of delivery for 8.1% and these women scored higher on fear (W-DEQ 87.6 ± 26.5, VAS median 7.0) than those who preferred vaginal delivery (W-DEQ 61.8 ± 18.7, VAS 2.7, P < 0.001, respectively). Those with a previous caesarean scored higher on fear (W-DEQ 73.2 ± 23.5, VAS 5.1) than parous women without previous caesarean (W-DEQ 63.3 ± 20.8, VAS 2.9, P < 0.001, respectively). Those with a history of a vacuum extraction (VE) (W-DEQ 70.6 ± 19.7, VAS 5.0) had higher fear scores than those without (W-DEQ 64.8 ± 22.0, P < 0.05 and VAS 3.0, P < 0.001). Conclusion, Severe fear of childbirth was more common in nulliparous women, in later pregnancy, and in women with previous caesarean section or VE. Caesarean section as a preferred mode of childbirth was strongly associated with high score in both W-DEQ and VAS. [source]

Cluster randomised trial of an active, multifaceted educational intervention based on the WHO Reproductive Health Library to improve obstetric practices

BJOG : AN INTERNATIONAL JOURNAL OF OBSTETRICS & GYNAECOLOGY, Issue 1 2007
AM Gülmezoglu
Objective, We conducted a trial to evaluate the effect of an active, multifaceted educational strategy to promote the use of the WHO Reproductive Health Library (RHL) on obstetric practices. Design, Cluster randomised trial. The trial was assigned the International Standardised Randomised Controlled Trial Number ISRCTN14055385. Settings, Twenty-two hospitals in Mexico City and 18 in the Northeast region of Thailand. Methods, The intervention consisted primarily of three interactive workshops using RHL over a period of 6 months. The focus of the workshops was to provide access to knowledge and enable its use. A computer and support for using both the computer and RHL were provided at each hospital. The control hospitals did not receive any intervention. Main outcome measures, The main outcome measures were changes in ten selected clinical practices as recommended in RHL starting approximately four to six months after the third workshop. Clinical practice data were collected at each hospital from 1000 consecutively delivered women or for a 6-month period whichever was reached sooner. Results, The active, multifaceted educational intervention we employed did not affect the ten targeted practices in a consistent and substantive way. Iron/folate supplementation, uterotonic use after birth and breastfeeding on demand were already frequently practiced, and we were unable to measure external cephalic version. Of the remaining six practices, selective, as opposed to routine episiotomy policy increased in the intervention group (difference in adjusted mean rate = 5.3%; 95% CI ,0.1 to 10.7%) in Thailand, and there was a trend towards an increased use of antibiotics at caesarean section in Mexico (difference in adjusted mean rate = 19.0%; 95% CI: ,8.0 to 46.0%). There were no differences in the use of labour companionship, magnesium sulphate use for eclampsia, corticosteroids for women delivering before 34 weeks and vacuum extraction. RHL awareness (24.8,65.5% in Mexico and 33.9,83.3% in Thailand) and use (4.8,34.9% in Mexico and 15.5,76.4% in Thailand) increased substantially after the intervention in both countries. Conclusion, The multifaceted, active strategy to provide health workers with the knowledge and skills to use RHL to improve their practice led to increased access to and use of RHL, however, no consistent or substantive changes in clinical practices were detected within 4,6 months after the third workshop. [source]

Risk factors for third degree perineal ruptures during delivery

BJOG : AN INTERNATIONAL JOURNAL OF OBSTETRICS & GYNAECOLOGY, Issue 4 2001
J.W. de Leeuw
Objective To determine risk factors for the occurrence of third degree perineal tears during vaginal delivery. Design A population-based observational study. Population All 284,783 vaginal deliveries in 1994 and 1995 recorded in the Dutch National Obstetric Database were included in the study. Methods Third degree perineal rupture was defined as any rupture involving the anal sphincter muscles. Logistic regression analysis was used to assess risk factors. Main outcome measures An overall rate of third degree perineal ruptures of 1.94% was found. High fetal birthweight, long duration of the second stage of delivery and primiparity were associated with an elevated risk of anal sphincter damage. Mediolateral episiotomy appeared to protect strongly against damage to the anal sphincter complex during delivery (OR: 0.21, 95% CI: 0.20,0.23). All types of assisted vaginal delivery were associated with third degree perineal ruptures, with forceps delivery (OR: 3.33, 95%-CI: 2.97,3.74) carrying the largest risk of all assisted vaginal deliveries. Use of forceps combined with other types of assisted vaginal delivery appeared to increase the risk even further. Conclusions Mediolateral episiotomy protects strongly against the occurrence of third degree perineal ruptures and may thus serve as a primary method of prevention of faecal incontinence. Forceps delivery is a stronger risk factor for third degree perineal tears than vacuum extraction. If the obstetric situation permits use of either instrument, the vacuum extractor should be the instrument of choice with respect to the prevention of faecal incontinence. [source]