Economic modelling of antenatal screening and ultrasound scanning programmes for identification of fetal abnormalities

OBJECTIVE

Within the framework of a health technology assessment and using an economic model, to determine the most clinically and cost effective policy of scanning and screening for fetal abnormalities in early pregnancy.

DESIGN

A discrete event simulation model of 50,000 singleton pregnancies.

SETTING

Maternity services in Scotland.

POPULATION

Women during the first 24 weeks of their pregnancy.

METHODS

The mathematical model was populated with data on uptake of screening, prevalence, detection and false positive rates for eight fetal abnormalities and with costs for ultrasound scanning and serum screening. Inclusion of abnormalities was based on the relative prevalence and clinical importance of conditions and the availability of data. Six strategies for the identification of abnormalities prenatally including combinations of first and second trimester ultrasound scanning and first and second trimester screening for chromosomal abnormalities were compared.

MAIN OUTCOME MEASURES

The number of abnormalities detected and missed, the number of iatrogenic losses resulting from invasive tests, the total cost of strategies and the cost per abnormality detected were compared between strategies.

RESULTS

First trimester screening for chromosomal abnormalities costs more than second trimester screening but results in fewer iatrogenic losses. Strategies which include a second trimester ultrasound scan result in more abnormalities being detected and have lower costs per anomaly detected.

CONCLUSIONS

The preferred strategy includes both first and second trimester ultrasound scans and a first trimester screening test for chromosomal abnormalities. It has been recommended that this policy is offered to all women in Scotland.

Fertility and ageing

The late 20th century trend to delay birth of the first child until the age at which female fecundity or reproductive capacity is lower has increased the incidence of age-related infertility. The trend and its consequences have also stimulated interest in the possible factors in the female and the male that may contribute to the decline in fecundity with age; in the means that exist to predict fecundity; and in the consequences for pregnancy and childbirth. In the female, the number of oocytes decreases with age until the menopause. Oocyte quality also diminishes, due in part to increased aneuploidy because of factors such as changes in spindle integrity. Although older male age affects the likelihood of conception, abnormalities in sperm chromosomes and in some components of the semen analysis are less important than the frequency of intercourse. Age is as accurate as any other predictor of conception with assisted reproductive technology. The decline in fecundity becomes clinically relevant when women reach their mid-30s, when even assisted reproduction treatment cannot compensate for the decline in fecundity associated with delaying attempts at conceiving. Pregnancies among women aged >40 years are associated with more non-severe complications, more premature births, more congenital malformations and more interventions at birth.

Is midwife workload associated with quality of process of care (continuous electronic fetal monitoring [CEFM]) and neonatal outcome indicators? A prospective study in consultant-led labour wards in Scotland

Evidence for staffing recommendations in labour wards is scant. This study aimed to test association between midwife workload with adjusted process of continuous electronic fetal monitoring (CEFM) and neonatal outcome indicators. This was a prospective workload study in 23 consultant-led labour wards in Scotland. There were 3489 livebirths during September 2000, and 1561 consecutively delivered women with CEFM case review during the mid-two weeks. Process measures were: adjusted rates of CEFM, appropriate CEFM, and time to medical response for a serious fetal heart trace abnormality. Neonatal outcome indicators were: Apgar score < 7 at 5 minutes, admission to neonatal unit (NNU) > 48 hours, and neonatal resuscitation. Complete information was available for 99% (2553/2576) of workload time points, 99% (1559) of CEFM process, and 3083 eligible neonates. There were no associations between occupancy or staffing ratios and adjusted CEFM process, Apgar < 7 at 5 minutes (0.98 [0.83, 1.15]) or admission to NNU for > 48 hours (0.97 [0.95, 1.00]). However, there was association between increasing staffing ratios and lower odds of adjusted neonatal resuscitation (excluding bag and mask only) (0.97 [0.94, 0.99]). The direction of effect of increasing workload suggests detriment to outcome indicators, although the size of effect may be small.

Staging quality is related to the survival of women with endometrial cancer: a Scottish population based study. Deficient surgical staging and omission of adjuvant radiotherapy is associated with poorer survival of women diagnosed with endometrial cancer in Scotland during 1996 and 1997

The association between treatment variation and survival of women with endometrial cancer was investigated. A retrospective cohort based upon the complete Scottish population registered on in-patient and day-case hospital discharge data (Scottish Morbidity Record-1) and cancer registration (Scottish Morbidity Record-6) coded C54 and C55 in ICD10, between 1st January 1996 to 31st December 1997 were analysed. Seven hundred and three patients who underwent surgical treatment out of 781 patients that were diagnosed with endometrial cancer in Scotland during 1996 and 1997. The overall quality of surgical staging was poor. The quality of staging was related to both the year that the surgeon passed the Member of the Royal College of Obstetricians and Gynaecologists examination and also to 'specialist' status but was not related to surgeon caseload. Two clinically important prognostic factors were found to be associated with survival; whether the International Federation of Obstetrics and Gynaecology stage was documented, RHR=2.0 (95% CI=1.3 to 3.1) and also to the use of adjuvant radiotherapy, RHR=2.2 (95% CI=1.5 to 3.5). The associations with survival were strongest in patients with advanced disease, International Federation of Obstetrics and Gynaecology stages 1C through to stage 3. Deficiencies in staging and variations in the use of adjuvant radiotherapy represent a possible source of avoidable mortality in patients with endometrial cancer. Consequently, there should be a greater emphasis on improving the overall quality of surgical staging in endometrial cancer.

A comparison of data obtained from service providers and service users to assess the quality of maternity care

OBJECTIVE

to compare data obtained from two sources, service providers and service users, regarding the maternity services in Scotland.

DESIGN

an audit of maternity services involving site visits, staff interviews and a cross-sectional survey of service users.

PARTICIPANTS

lead professionals in every consultant-led maternity unit in Scotland and all 1639 women giving birth in Scotland during a ten-day period.

DATA COLLECTION

structured group interviews with service providers and a questionnaire survey of recently delivered women.

DATA ANALYSIS

professionals' and women's responses were cross-tabulated and differences in proportions were tested for statistical significance using the chi-square test.

FINDINGS

a total of 1137 women completed the questionnaire (response rate 69%). Overall, there was good agreement between professionals' and women's perceptions of the aspects of care studied. However, there were disparities in some areas. For example, staff in eight units reported mechanisms to ensure early distribution of a free national pregnancy book; however, in six of these units less than 75% of women actually received this book prior to their first hospital visit. Eighteen units reported that they offer a postnatal 'reunion meeting'; in ten of these units, less than 50% of women were aware of the reunion meeting. Eighteen units reported a policy of each woman having a lead professional or care co-ordinator; in three of these units, less than 50% of women perceived that they had a care co-ordinator and for most women, the profession (midwife, general practitioner or obstetrician) of their perceived co-ordinator differed from that expected on the basis of staff reports. There was some evidence overall that unit policies had a direct influence on women's responses.

CONCLUSIONS AND IMPLICATIONS FOR PRACTICE

this study demonstrates the importance of using a range of complementary methods of data collection and of ascertaining both service users' and providers' views when assessing the quality of care. Further research is required to explore differences in service provider's and women's perceptions and how this information can be used to improve the quality of maternity care. The finding that service provision may influence women's preferences has important implications for service planning, in particular the introduction of new models of care, and this needs further exploration.

The impact of national clinical guidelines on obstetricians in Scotland

OBJECTIVE

To audit reported clinical practice in relation to four national obstetric guidelines on The Preparation of the Foetus for Preterm Delivery, The Management of Mild, Non-proteinuric Hypertension in Pregnancy, The Management of Pregnancy in Women with Epilepsy and The Management of Postpartum Haemorrhage.

DESIGN

Questionnaire surveys before and after dissemination of the guidelines.

SUBJECTS

One hundred and sixty one consultants and senior specialist registrars in Scotland.

RESULTS

The response rates to the baseline and follow-up surveys were 85% and 74% respectively. Over 90% of the obstetricians kept the guidelines for reference and 85% had been prompted to change or reconsider their practice. Reported compliance improved significantly for six out of twenty nine recommendations covering: the use of tocolysis in women at risk of pre-term labour; the use of prophylactic antibiotics or entry to a clinical trial for pre-term, pre-labour rupture of the membranes; the initiation of steroid therapy in women with insulin-dependent diabetes mellitus; and the prescribing of periconceptual folic acid and vitamin K to women with epilepsy. There were no significant improvements in relation to mild, non-proteinuric hypertension or post-partum haemorrhage.

CONCLUSIONS

There were significant improvements in the reported management of women at risk of preterm labour and those with epilepsy. However, reported practice in relation to mild, non-proteinuric hypertension and post-partum haemorrhage has improved little. This is possibly because the guidelines for these topics were relatively complicated to understand and apply, and established patterns of practice more resistant to change.

The risk of neonatal death in relation to birth weight and maternal hypertensive disease in infants born at 24-32 weeks

OBJECTIVE

To determine the risk of neonatal death (NND) in relation to birth weight for gestational age and the presence or absence of maternal hypertensive disease in preterm neonates.

DESIGN

Record linkage of maternity data and neonatal mortality data.

SETTING

Scotland, UK.

POPULATION

A group of 6946 live singleton preterm neonates without lethal congenital abnormalities born at 24-32 weeks between 1986 and 1992 inclusive. This group included 1448 cases of maternal hypertensive disease and 850 neonatal deaths.

MAIN OUTCOME MEASURE

Neonatal death.

RESULTS

The median birth weight for each gestational week was estimated from a fitted curve and each birth weight was recalculated as a multiple of the relevant median. The frequency of NND was much higher at lower gestations (73% at 24 weeks down to 2% at 32 weeks). Though the overall frequency of NND was lower in cases with hypertensive disease (8.6% versus 13.2%) this can be attributed to the fact that there were relatively fewer hypertensive cases in the high risk group at 24-27 weeks. In the 5498 cases not associated with maternal hypertensive disease, there were 726 NNDs. The mean MoM of birthweight for these NNDs was 0.982 (95% CI 0.967-0.996); this was only marginally different from the population mean (0.998; 95% CI 0.993-1.004). In the 1448 cases with maternal hypertensive disease, there were 124 NNDs. The overall birthweight for gestational age in the hypertensive group was substantially less than that of the whole population (mean MoM 0.84; 95% CI 0.83-0.85) and that of the 124 NNDs was still lower (mean MoM 0.75; 95% CI 0.724-0.782). For both hypertensive and non-hypertensive cases, inspection of the data categorised into deciles showed that there was a continuous increase in the frequency of NND throughout the weight range, being lowest for the heaviest babies and highest for those in the lower centiles.

CONCLUSION

(1) There is a relationship between birthweight for gestational age and risk of NND in infants born at 24-32 weeks; (2) this relationship is a continuum throughout the whole range of birthweight, not focused exclusively on a group defined as SGA; (3) provided appropriate birthweight standards are used, there is no extra effect on mortality from maternal hypertensive disease.

A national survey of women's views of their maternity care in Scotland

OBJECTIVE

A survey of women's views of their care was undertaken as part of a national audit of maternity services in Scotland. The overall aim of the audit was to determine the extent to which recommendations from recent national policy documents had been adopted in practice.

DESIGN

A cross-sectional study seeking the views of all women giving birth throughout Scotland during a 10-day period in September 1998.

PARTICIPANTS

All women giving birth in Scotland within the survey period were eligible to participate in the study. Women unable to complete the questionnaire in English, women for whom the midwife deemed it inappropriate, and women who delivered but no longer resided in Scotland by their 10th postnatal day were excluded.

DATA COLLECTION

A self-complete questionnaire given to the woman by her community midwife for completion on her 10th postnatal day.

DATA ANALYSIS

Analysis was carried out using the statistical package SPSS for Windows. Descriptive statistics were produced for all variables. Statistical tests of significance were not used, as this was primarily a descriptive survey.

FINDINGS

Of the 1152 questionnaires returned, 1137 were suitable for analysis. This gave a response rate of 69% of the eligible population (1639). Most women (80%) had the majority of their antenatal care in the community but only one third had a choice about this. Sixty-nine per cent of women received care from one or two people. However, only 37% had a choice about who these people were. The majority of women gave birth in hospital (99%). Sixty-one per cent felt that they had a choice about where they could have their baby. However, fewer women had a choice about having a home birth (41%) or a DOMINO delivery (23%). Just over half the women felt that it was important to be cared for by a midwife that they had met during pregnancy but only 12% of women achieved this. Sixty-two per cent of women had talked to a health professional about what happened during labour and delivery but less than half had spoken with a professional who was present during her labour or birth.

CONCLUSIONS

Considerable efforts have been made to improve information and choice for women. However, it is clear that further work is needed if women are to be offered informed choice in the provision of their maternity care.

The Scottish Programme for Clinical Effectiveness in Reproductive Health (SPCERH): lessons from a three-year programme

OBJECTIVE

To describe the work of the Scottish Programme for Clinical Effectiveness in Reproductive Health (SPCERH) in order to draw lessons applicable to other clinical effectiveness programmes.

DESIGN

Overview of an integrated clinical effectiveness programme relating to reproductive health.

SETTING

Scotland.

SUBJECTS

The programme is designed to reach all professionals who share responsibility for reproductive healthcare--including obstetrician/gynaecologists, midwives, general practitioners, family planning doctors, commissioners of services and NHS managers.

RESULTS

During its first three-year Workplan, SPCERH has conducted an integrated programme of audit, guideline and educational activities. Findings have been disseminated using multi-faceted approaches including publications, presentations and interactive meetings. Evidence from surveys undertaken within the Programme indicates that clinicians have changed or reconsidered their practice in several key areas in response to audit and guideline recommendations made by the Programme.

CONCLUSIONS

As a way of funding and organising clinical effectiveness activities, the integrated Programme has many advantages over the stand-alone Project. These advantages include: enabling the linkage of national audits to national guidelines and other forms of NHS guidance; enabling the re-audit of topics after a time interval sufficient to allow for the implementation of change; the building of expertise within a dedicated team and the use of that expertise across a range of linked projects; the availability of an experienced team which can respond to new priority issues at short notice.

Criteria for clinical audit of the quality of hospital-based obstetric care in developing countries

Improving the quality of obstetric care is an urgent priority in developing countries, where maternal mortality remains high. The feasibility of criterion-based clinical audit of the assessment and management of five major obstetric complications is being studied in Ghana and Jamaica. In order to establish case definitions and clinical audit criteria, a systematic review of the literature was followed by three expert panel meetings. A modified nominal group technique was used to develop consensus among experts on a final set of case definitions and criteria. Five main obstetric complications were selected and definitions were agreed. The literature review led to the identification of 67 criteria, and the panel meetings resulted in the modification and approval of 37 of these for the next stage of audit. Criterion-based audit, which has been devised and tested primarily in industrialized countries, can be adapted and applied where resources are poorer. The selection of audit criteria for such settings requires local expert opinion to be considered in addition to research evidence, so as to ensure that the criteria are realistic in relation to conditions in the field. Practical methods for achieving this are described in the present paper.

Patient satisfaction with the management of infertility

The objective of this study was to assess patient satisfaction with the investigation and initial management of infertility. A postal questionnaire survey was carried out of 1366 women attending outpatient clinics for the investigation and initial management of infertility at 12 hospitals throughout Scotland. The response rate to the questionnaire was 59% (806/1366). Overall, 87% of responders were satisfied or very satisfied with their care but a number of deficiencies were identified. Thirty-nine per cent had never been asked to bring their partner to the clinic and 86% felt they had not been given enough help with the emotional aspects of infertility. Forty-seven per cent felt they were not given a clear plan for the future and 23% of those who had been given drug treatments reported receiving little or no information about the treatment or possible side-effects. Overall, only a third had been given any written information and 78% expressed a wish for more written information. Women ranked 'the information and explanation given' and the 'attitude of the doctor at the clinic' highly in comparison to other aspects of their care, including 'help with the emotional aspects of infertility'. In general women were satisfied with their care but improvements may be made by giving more explanation and written information and by adopting a more couple-centred approach. Where resources allow, clinics should take steps to address the emotional aspects of infertility.

A survey of infertility practices in primary care in Scotland

An 83% response rate was obtained to a postal questionnaire survey of general practitioners (GPs) carried out as part of a national infertility audit in Scotland. This provided information about how GPs are managing infertility and their opinions on 12 suggested criteria for good practice in a primary care setting.

Endometrial assessment procedures: an audit of current practice in Scotland

The objective was to determine, in relation to endometrial assessment procedures, the extent to which the current practice of gynaecologists in Scotland (as assessed both by questionnaire survey of clinicians and review of hospital records) accords with recommendations in recent evidence-based guidelines. All 132 consultant gynaecologists in Scotland were surveyed and 123 (93%) responded. In addition, the case records of 1199 consecutive women undergoing endometrial assessment procedures in 12 representative hospitals were reviewed. Over two thirds of consultants agreed that endometrial assessment procedures are seldom indicated in women aged under 40 years and over 80% agreed that when such procedures are indicated, outpatient endometrial biopsy represents the method of choice. However, the review of case records showed that 23% of the women who underwent endometrial assessment were aged under 40 years and only 44% of the procedures undertaken were out-patient endometrial biopsies. We conclude that some Scottish women may be undergoing endometrial assessment procedures unnecessarily and that, in some centres, traditional dilatation and curettage is being replaced by hysteroscopy under general anaesthetic in theatre although there is no evidence that this procedure provides more clinically useful information than out-patient endometrial biopsy.

A randomised comparison of oral and vaginal misoprostol for cervical priming before suction termination of pregnancy

OBJECTIVE

To assess the effectiveness and acceptability of oral misoprostol, self-administered 12 h before surgery, as a cervical priming agent prior to day case suction termination of pregnancy.

DESIGN

Randomised trial comparing oral misoprostol with the local standard regimen of vaginal misoprostol.

SUBJECTS

Sixty consecutive women scheduled for day case suction termination in one gynaecology unit.

INTERVENTIONS

Cervical priming with misoprostol 400 mg orally, 12 h prior to surgery or 800 mg vaginally, two to four hours prior to surgery.

MAIN OUTCOME MEASURES

Basal cervical dilatation, cumulative force required to dilate the cervix to 9 mm, operative blood loss and side effects (nausea, vomiting, diarrhoea, abdominal pain and vaginal bleeding).

RESULTS

There were no significant differences between the oral and vaginal treatment groups in relation to basal dilatation, cumulative force to achieve 9 mm dilatation or gastrointestinal side effects. However, those in the oral group experienced more severe pain and heavier pre-operative bleeding. Two patients in the oral group experienced incomplete abortion at home after taking misoprostol and a further patient required early admission because of heavy bleeding.

CONCLUSIONS

Because of the unpredictability of action of oral misoprostol, with incomplete abortion or heavy bleeding occurring prior to admission in three patients, we cannot recommend the dosage schedule evaluated here for routine clinical use.