The role of investigations for term stillbirths

No. 394-Stillbirth Investigation

OBJECTIVES

To provide an investigation protocol to help health care providers determine the cause of a fetal death.

OPTIONS

Consideration has been given to protocols for the investigation of fetal death that are currently available in Canada and in other countries.

OUTCOMES

Identification of possible causes of stillbirth and their relationship to future pregnancies.

EVIDENCE

Articles related to the etiology of fetal death were identified in a search of PubMed (June 2006 to September 2018), the Cochrane Library, and investigation protocols from the American College of Obstetricians and Gynecologists, the International Stillbirth Alliance Collaborative for Improving Classification of Perinatal Deaths, the Royal College of Obstetricians and Gynaecologists, the Queensland clinical guidelines, and the Reproductive Care Program of Nova Scotia.

BENEFITS

To provide better advice for women regarding possible causes of fetal death and implications for future pregnancies.

VALIDATION

The evidence obtained was reviewed and evaluated by the Maternal-Fetal Medicine Committee and the Clinical Practice Obstetrics Committee of the Society of Obstetricians and Gynaecologists of Canada. The level of evidence and quality of the recommendation made was described using the Evaluation of Evidence criteria of the Canadian Task Force on Preventive Health Care.

RECOMMENDATIONS

Evaluation of 1025 fetal deaths: proposed diagnostic workup

OBJECTIVE

We sought to evaluate the contribution of different diagnostic tests for determining cause of fetal death. Our goal was to propose a workup guideline.

STUDY DESIGN

In a multicenter prospective cohort study from 2002 through 2008, for 1025 couples with fetal death ≥20 weeks' gestation, an extensive nonselective diagnostic workup was performed. A panel classified cause and determined contribution of diagnostics for allocating cause.

RESULTS

A Kleihauer-Betke, autopsy, placental examination, and cytogenetic analysis were abnormal in 11.9% (95% confidence interval [CI], 9.8-14.2), 51.5% (95% CI, 47.4-55.2), 89.2% (95% CI, 87.2-91.1), and 11.9% (95% CI, 8.7-15.7), respectively. The most valuable tests for determination of cause were placental examination (95.7%; 95% CI, 94.2-96.8), autopsy (72.6%; 95% CI, 69.2-75.9), and cytogenetic analysis (29.0%; 95% CI, 24.4-34.0).

CONCLUSION

Autopsy, placental examination, cytogenetic analysis, and testing for fetal maternal hemorrhage are basic tests for workup after fetal death. Based on the results of these tests or on specific clinical characteristics, further sequential testing is indicated.

The role of placental cytogenetic cultures in intrauterine and neonatal deaths

Knowledge of chromosomal status is useful in helping to explain fetal and neonatal deaths, but maceration has been felt to compromise the success rate. As well as skin fibroblast culture, the placenta can be sampled and this may be useful where permission for autopsy is refused. We examined placental cytogenetic results from 250 cases over a 5-year period. There was a success rate of 84.4%, with neither weight (< or > 500 g) nor maceration status showing a significant impact. Placentas sampled within 1 day were significantly more likely to give a positive culture. The results suggested that placental cytogenetic cultures should be attempted in all perinatal deaths where such information is desired.

Stillbirth in developing countries: a review of causes, risk factors and prevention strategies

OBJECTIVE

To understand the rates, causes and risk factors for stillbirth in developing countries as well as the strategies that have been evaluated to reduce stillbirth.

METHODS

We searched the English literature for 2003-2008 for all articles related to stillbirth and perinatal mortality in developing countries and reviewed all related publications.

RESULTS

Despite the large number of stillbirths worldwide, the topic of stillbirths in developing countries has received very little research, programmatic or policy attention. In many developing countries, almost half of the deliveries occur at home, and under-reporting of stillbirths is a significant problem. Reliable data about rates and causes are unavailable in many areas of the world. Nevertheless, of the estimated 3.2 million stillbirths that occur yearly world-wide, the vast majority occur in developing countries. Rates in many developing countries are 10-fold greater or more than in developed countries. There is not a standard international classification system that defines cause of death, nor is there agreement about the lower limits of birthweight or gestational age that define stillbirth, making comparisons of causes of stillbirth or rates over time or between sites problematic. From available data, prolonged and obstructed labour, pre-eclampsia and various infections, all without adequate treatment, appear to account for the majority of stillbirths in developing countries. Identification and treatment of maternal syphilis has been effective in reducing stillbirth risk, as has improvements in access to emergency obstetrical services and particularly caesarean section.

CONCLUSIONS

Further research is needed to understand the causes and the best preventive strategies for stillbirth specific to geographic areas. However, based on current data, better access to appropriate obstetric care, particularly during labour and delivery and better screening and treatment of syphilis should reduce developing country stillbirth rates dramatically.

Prise en charge de la mort in utero : quel bilan proposer?

OBJECTIVE

To assess the value of para-clinical exams prescribed in case of in utero foetal death, to result in the establishment of a new algorithm of diagnostic tests.

MATERIALS AND METHODS

A retrospective analysis on a series of 106 stillbirths gathered between September 1989 and December 1998 in the obstetrical and gynaecological department of the Lausanne University Hospital which is a tertiary centre. Stillbirth was defined as foetal death occurring as from the date of foetal viability. Thus, only pregnancies from 24 weeks and onwards were included in this series. We excluded all stillbirths occurring during medical termination of pregnancy and cases with incomplete data files. The Fretts' classification was used. The different exams asked by the physician were screened and we analysed their pertinence to determine the aetiological diagnosis for each case. The search for significant risk factors was also taken into account. We compared our management of in utero foetal death with data from the literature to propose a new algorithm.

RESULTS

The aetiology of in utero foetal death could be attributed in ninety percent of the cases. The principal causes were in utero growth retardation (19.8%), foetal congenital and chromosomal anomalies (18.9%), infections (15.1%), placental abruption (7.5%), preeclampsia (5.6%), maternal diabetes (3.8%). The remaining 18.9% are divided in to miscellaneous causes. In 10.4% of the cases we could not find any explanation to the death of the foetus. The exams that yielded the most information when done were: foetal autopsy which was abnormal in 92.7%, placental investigation which was abnormal in 93% and the babygramme (X-ray of the foetal skeleton) which was abnormal in 53%. Maternal serology for infections was informative in 6.6% of the cases.

CONCLUSION

We present here a protocol for the diagnostic management of stillbirth which is differentiated according to the circumstances surrounding the event. This should prove useful to reduce superfluous tests.

My approach to performing a perinatal or neonatal autopsy

An opportunity to determine the cause of death, factors that may have a role in it, and the extent and cause of malformations is provided by perinatal autopsy. The family may be assisted in finding closure after the death of their infant by the information obtained. Insight into classifying infants appearing normal into one of three groups, small, appropriate and large for gestational age, has been provided, as each group tends to have specific causes of death. In infants with congenital anomalies, patterns of malformation may lead us to the diagnosis. An accurate diagnosis is required to provide counselling for a subsequent pregnancy.

Stillbirth and Bereavement: Guidelines for Stillbirth Investigation

This document has been archived because it contains outdated information. It should not be consulted for clinical use, but for historical research only. Please visit the journal website for the most recent guidelines.

Stillbirth in developing countries

OBJECTIVE

To conduct a systematic review of the literature on stillbirths in developing countries.

METHOD

Review of the English literature for all articles related to stillbirth in developing countries published from 1975 to 2005.

RESULTS

Because almost half of the deliveries in developing countries occur at home, under-reporting of stillbirths is a huge problem, and reliable data about rates and causes are difficult to obtain. Hospital stillbirth data are often subject to substantial bias and the ability to generalize from these data is unknown. Nevertheless, at least 4 million stillbirths occur yearly, the vast majority in developing countries, with rates in many developing countries ten-fold higher than elsewhere. Prolonged and obstructed labor, preeclampsia and various infections, all without adequate treatment, account for the majority of stillbirths.

CONCLUSION

Despite the large number of stillbirths worldwide, the topic of stillbirths in developing countries has received very little research, programmatic or policy attention. Better access to appropriate obstetric care, especially during labor, should reduce developing country stillbirth rates dramatically.