Maternal mortality: What can we learn from stories of postpartum haemorrhage?
Article Outline
- Summary
- Introduction
- Approach
- Overview of maternal deaths in Australia 2003–2005
- Obstetric haemorrhage
- Vignettes
- Implications for practice
- Conclusion
- Acknowledgements
- References
- Copyright
Summary
Death from pregnancy is rare in developed countries such as Australia but is still common in third world and developing countries. The investigation of each maternal death yields valuable information and lessons that all health care providers involved with the care of women can learn from. The aim of these investigations is to prevent future maternal morbidity and mortality.
Obstetric haemorrhage remains a leading cause of maternal death internationally. It is the most common cause of death in developing countries. In Australia and the United Kingdom, obstetric haemorrhage is ranked as the 4th and 3rd most common cause of direct maternal death respectively. In a number of cases there are readily identifiable factors associated with the care that the women received that may have contributed to their death. It is from these identifiable factors that both midwives and doctors can learn to help prevent similar episodes from occurring.
This article will identify some of the lessons that can be learnt from the recent Australian and UK maternal death reports. This paper presents an overview of the process and systems for the reporting of maternal death in Australia. It will then specifically focus on obstetric haemorrhage, with a focus on postpartum haemorrhage, for the 12-year period, 1994–2005. Vignettes from the maternal mortality reports in Australia and the United Kingdom are used to highlight the important lessons for providers of maternity care.
Keywords: Maternal death, Maternal mortality, Midwives, Obstetricians, Maternity, Obstetric haemorrhage, Postpartum haemorrhage
Introduction
Maternal death in developed countries such as Australia and the United Kingdom (UK) is rare. In these countries, pregnancy and childbirth is, for the most part, a normal and happy event culminating in the birth of the baby and a healthy mother. Maternal death is not only unexpected, but a tragedy for all involved. There are often valuable lessons that can be learnt. These lessons have the potential to prevent future deaths and significant maternal morbidity occurring under similar circumstances. It is important that all health care providers caring for pregnant women learn from these experiences.
Maternal death is defined by the World Health Organization (WHO) as a death occurring anytime during pregnancy and up to 42 days postpartum. A late maternal death is one that occurs between 42 days and 1 year after pregnancy.1 Maternal death is used as a benchmark of the country's overall health and development status. A key goal of the United Nations Millennium Project (which runs from 1990 to 2015) is to reduce the maternal mortality ratio by three quarters.2 Unfortunately, at a global level, maternal mortality has decreased by less than 1% per year between 1990 and 2005 which is far below the 5.5% annual improvement needed to reach the target set by the Millennium Project.2 While many of the issues related to global maternal mortality focus on poorer nations, there are lessons to be learnt for all countries.
Maternal death is classified into direct, indirect and incidental deaths. Direct deaths result from obstetric complications (e.g., obstetric haemorrhage, eclampsia). Indirect deaths result from an illness or condition that was in some way exacerbated by the pregnant state (e.g., cardiac disease, psychiatric illness). Incidental deaths are those unrelated to the pregnancy (e.g., road traffic accidents).1, 3
Many countries report on their maternal deaths triennially (every 3 years) in order to make the data meaningful and to allow for recommendations to be made. It has long been recognised that maternal deaths are just the tip of the “iceberg”. The WHO report “Beyond the Numbers” makes comment that “for every woman who dies, many more suffer from serious conditions that can affect them for the rest of their lives.”4 It is likely that this is equally the case in developing and developed nations.
In contrast to other developed countries, it is not mandatory to report a maternal death in Australia.5 In recent years, a maternal death in hospital is reported nationally as a Sentinel Event.5 Maternal deaths are notified to individual state or territory Health Department Maternal Mortality Committees via a number of different avenues. These include: individual practitioner reporting; coronial investigations and the register of Births, Deaths and Marriages. Each committee is made up of a multidisciplinary team including midwives; obstetricians; anaesthetists; pathologists; physicians; perinatal psychiatrists and epidemiologists. A confidential enquiry is conducted on each death, the aim is to identify a principal cause of the death, assign a classification as well as to identify any potentially avoidable factors. Enquiry findings are forwarded to the National Advisory Committee on Maternal Mortality who review all deaths and collate a report every 3 years.5 The triennial report is produced under the auspices of the Australian Institute of Health and Welfare (AIHW) with the most recent report funded by the Australian Commission on Safety and Quality in Health Care. There are significant limitations with the current system as not all states and territories have active maternal mortality review committees and it is likely that not all maternal deaths are accounted for in Australia.5
Australia6 and the UK7 have recently published their most recent reports. These reports contain useful and important lessons for all health professionals involved in the care of childbearing women. These lessons have relevance for midwives and others working in maternity care. This article is the first in a series that will identify some of the lessons that can be learnt from the Australian and UK maternal death reports.
Globally, obstetric haemorrhage remains the most significant cause of maternal mortality.8 It is estimated that postpartum haemorrhage is the most common cause of maternal death across the world, responsible for more than 25% of deaths annually9 and is a significant cause of severe maternal morbidity. For these reasons, obstetric haemorrhage in relation to maternal death is the focus of this paper.
This article provides an overview of the most recent report on maternal deaths in Australia for the triennia 2003–2005. It then focuses on obstetric haemorrhage, with a focus on postpartum haemorrhage, making reference to the data for the 12-year period, 1994–2005. Short vignettes or stories of real cases from the Australian and UK maternal mortality reports are used to highlight a number of the issues and learning points for midwives and maternity services. Future articles will address amniotic fluid embolism, hypertension, thrombosis and thromboembolism and cardiac disease. We hope this series of articles will encourage midwives and other clinicians to read the reports from which these stories come, to reflect on the findings and recommendations and also how they might impact on their own practice.
Approach
Data were sourced from published reports of maternal deaths in Australia and the United Kingdom (UK). These are observational data and the numbers presented need to be interpreted with caution due to the small numbers, and variability in ascertainment by time and the different definitions of viability in the two countries. The maternal mortality ratio is used to report maternal mortality. It is defined for international use as the number of maternal deaths (direct and indirect) over a given period per 100,000 live births over the same period.10
The National Perinatal Statistics Unit in Australia and the Confidential Enquiry in Maternal and Child Health (CEMACH) in the UK provided permission to use the vignettes that have been selected to illustrate the best practice principles. The source of these vignettes is presented under each of the Figures.
Overview of maternal deaths in Australia 2003–2005
There were 65 maternal deaths in the triennium 2003–2005. Selected characteristics of these deaths are summarised in Table 1. There has been a decline in the MMR from 12.8 per 100,000 women giving birth in 1976–1978 to 8.4 per 100,000 women giving birth in 2003–2005.6 This is largely due to a decline in direct deaths over the period although the changes in data collection, ascertainment and state and territory system could account for the differences over time. The data in the most recent report (2003–2005) was however not validated against other databases (e.g., Australian Bureau of Statistics Mortality Data and National Hospital Morbidity Database) so it is possible that the true number of deaths is higher than reported.
Table 1. Maternal deaths in Australia 2003–2005.
| Selected statistics | Number | Percent | Maternal mortality ratio |
|---|---|---|---|
| Maternal death | 65 | 8.4 | |
| Direct | 29 | 44.6 | 3.7 |
| Indirect | 36 | 55.4 | 4.8 |
| Indigenous | 6 | – | 21.5b |
| aNon-Indigenous | 55 | – | 7.4b |
| Maternal age | |||
| 5 | 7.7 | 14.3 | |
| 38 | 58.5 | 6.5 | |
| 22 | 33.8 | 14.5 | |
aExcludes deaths (from the non-Indigenous numerator) where Indigenous status is not reported known. |
bThe denominator used in the MMR excludes women where Indigenous status is not known. |
The MMR for Australian Indigenous women was 2.9 times that of non-Indigenous women. Younger and older women had a higher MMR compared with women aged 20–34 years. The most common cause of direct maternal death was amniotic fluid embolism (28%). The other causes included hypertensive disorders (17%); thrombosis and thromboembolism (17%); and, obstetric haemorrhage (14%). Almost half (41%) of deaths were in women aged less than 30 years and half (52%) of the women were nulliparous or primiparous. The most common cause of indirect deaths was attributed to the category of cardiac conditions (28%). The other causes included psychiatric conditions (17%), non-obstetric haemorrhage (14%) and infection (11%). The majority (72%) of maternal deaths reported in 2003–2005 underwent a post mortem examination but this varied by classification.
Obstetric haemorrhage
In Australia and the UK between 1994 and 200511, 12, 13, 14, 15, 16 there were 75 deaths directly attributed to obstetric or uteroplacental haemorrhage (Table 2). Obstetric or uteroplacental haemorrhage accounted for 10–18% of all direct deaths in Australia and the UK in this time period.
Table 2. Number and proportion of direct maternal deaths related to obstetric haemorrhage over total direct deaths: Australia and UK, 1994–2005.6, 10, 11, 12, 13, 14, 15.
| Number and proportion of direct maternal deaths related to obstetric haemorrhage over total direct deaths | ||||||
|---|---|---|---|---|---|---|
| Australia | UK | |||||
| Deaths from haemorrhage | Direct deaths | % | Deaths from haemorrhage | Direct deaths | % | |
| 1994–96 | 5a | 46 | 11 | 12c | 134 | 9 |
| 1997–99 | 7b | 34 | 21 | 7c | 106 | 7 |
| 2000–02 | 9 | 32 | 28 | 17c | 106 | 16 |
| 2003–05 | 4 | 29 | 14 | 14c | 132 | 11 |
| Total | 25 | 141 | 18 | 50 | 478 | 10 |
aThere were 5 cases in which uteroplacental haemorrhage was the principal cause of death and 11 other cases in which uteroplacental haemorrhage was a contributory cause of death. |
bDefined as obstetric haemorrhage–postpartum haemorrhage. |
cIncludes placental abruption, placenta previa and postpartum haemorrhage. |
Recent reports from Australia and Canada confirm the increasing incidence of postpartum haemorrhage.17, 18, 19, 20 In Australia, it has been suggested that this increase is related to changes in management and/or reporting of postpartum haemorrhage.19 In Canada, the reason for the increase appears to be related to the rates of atonic postpartum haemorrhage, the causes of which are unknown and do not seem to be affected by either maternal age or previous caesarean section.17 Postpartum haemorrhage may occur for the first time in any pregnancy, and may recur in subsequent pregnancies.18
Haemorrhage in postpartum women can be massive and abrupt in onset. The blood flow to the uterus at term is between 700 and 800
mL/min and the uterus receive 20–25% of the body's total cardiac output. The haemodilution and increased blood volume that occurs in pregnancy are likely to have evolved as a protective mechanism against blood loss associated with delivery. As part of the normal physiological changes of pregnancy and delivery the heart rate increases and the blood pressure can decrease, these changes can mask the early subtle signs of a severe postpartum haemorrhage. Prompt, aggressive and expert care is required as the potential for rapid ongoing blood loss is high. All maternity care clinicians should be familiar with the management of postpartum haemorrhage, have a clear plan in place for its management and be prepared to call for urgent help earlier rather than later.
Vignettes
Four vignettes of women whose deaths were attributed to obstetric haemorrhage selected from the Australian and UK reports. These cases that were selected were those that broadly identified many of the themes and highlighted some of the lessons that midwives can learn from maternal mortality reports. These cases are not meant to be representative of all cases of PPH, they are illustrative of the common issues that are seen in maternity services. A 22-year-old woman having her first baby was admitted to hospital following an uneventful pregnancy for a post-dates induction of labour which resulted in a normal vaginal birth of a liveborn infant. She had an immediate postpartum haemorrhage of approximately 600 A 34-year-old woman having her second baby developed hypertension at about 32 weeks gestation. She presented to labour ward at 38 weeks gestation feeling unwell, was induced and proceeded to normal vaginal birth nine hours later. Her uterus became atonic about one hour after delivery with 1000 A woman who had a previous caesarean section, presented at 23 weeks gestation with an antepartum haemorrhage (APH). She was diagnosed with placenta praevia. She had two further minor APHs and at 34 weeks gestation was admitted, contracting with small bright vaginal blood loss. She proceeded to an emergency caesarean section where a live baby was born. She died despite massive transfusions and multidisciplinary involvement. Autopsy showed placenta praevia percreta, with erosion into the posterior wall of the urinary bladder. An African woman did not reveal her female genital mutilation (FGM) until late in pregnancy and was not referred to a specialist service for this. She had an elective caesarean section because it was considered that the consequences of her particular type of genital cutting would make vaginal delivery difficult. Although the operation was apparently straightforward, shortly afterwards she had a blood loss of several litres with a consequent fall in haemoglobin, which required transfusion. She continued to deteriorate with a steadily falling haemoglobin, rising pulse rate and falling blood pressure accompanied by poor urine output and increasing abdominal girth. Although she needed continual blood transfusion, an exploratory laparotomy was not performed until nearly two days later. By then she was in extremis, and several litres of blood were found in her abdomen. She sustained a cardiac arrest while still in theatre and could not be resuscitated.
mL and was treated with intravenous (IV) Syntocinon and Hartmanns solution. Approximately four hours later she suffered another postpartum haemorrhage of approximately 400
mL, which was treated with a further Syntocinon infusion. The placenta was documented to be complete. Over the next two days she had moderate lochia rubra loss and reported feeling dizzy. On postpartum day 3 she experienced a third postpartum haemorrhage of 500
mL and complained of feeling faint and cold. She was treated with IV fluids, bed rest and Haemaccel. The woman signed a medical release declining blood transfusion under any circumstances. An IV Syntocinon infusion was titrated to blood loss. She continued to have moderate loss of lochia rubra. On day four, with haemoglobin value 55
g/L, the intravenous catheter was removed. On day five, with haemoglobin 59
g/L, she was discharged home on iron tablets. She was re-admitted to hospital on day 11 following a further postpartum haemorrhage of 500
mL. Cervical dilatation and uterine curettage were carried out and placental tissue was removed. The woman was kept cool, intubated, sedated and paralysed after the procedure to reduce oxygen requirements and maintained on Haemaccel, inotropic support and IV fluids. She was transferred for hyperbaric oxygen treatment. She received three treatments, but rapidly deteriorated over the next two days and developed cardiac failure secondary to gross anaemia and died on day 13 postpartum. A postmortem examination was not carried out and the cause of death was deemed to be cardiac failure due to severe anaemia secondary to postpartum haemorrhage.
ml of blood clot expressed from the uterus. Six hours post the birth she had a second 1000
ml of blood clot expressed from the uterus. An examination under anaesthesia was carried out. There was no evidence of trauma found, no retained products, the uterus was ‘somewhat’ atonic. She developed acute severe pulmonary oedema in the recovery room and had a cardio-respiratory arrest about two hours later. Attempts to resuscitate her for several hours were unsuccessful.
Implications for practice
Whilst haemorrhage is often unpredictable there are a number of risk factors which can be identified. Clinicians should be aware of these risk factors in order to plan a woman's care with the appropriate consultation and referral to medical staff when required. The ACM's “National Midwifery Guidelines for Consultation and Referral”23 provide a comprehensive framework for midwives to work within; there would be benefit in its adoption nationally. Table 3 lists the risk factors for postpartum haemorrhage and details the level of consultation and/or referral required of the midwife caring for the woman.
Table 3. Risk factors for postpartum haemorrhage and the ACM's23 recommended level of consultation and referral.
| Risk factors for postpartum haemorrhage | Recommended level of consultation and referral |
|---|---|
| History of postpartum haemorrhage or retained placenta | B/C |
| High parity | A/B |
| Multiple pregnancy | C |
| Polyhydramnios | B/C |
| Fetal macrosomia | B/C |
| Anaemia | B/C |
| Placenta praevia, accreta or percreta | C |
| Placental abruption | C |
| Prolonged labour | B/C |
| Shoulder dystocia | C |
| Pre-eclampsia | C |
| Instrumental delivery | C |
| General anaesthesia | C |
| Fibroids | B/C |
| Mismanagement of the third stage | C |
| Retained placenta | C |
| Tocolytic drugs | C |
| Induced or augmented labours | C |
| Inversion of the uterus | C |
| Infection | C |
This article has identified a number of learning points for midwives, general practitioners and obstetricians, which complement the specific recommendations made by CEMACH7 (p. 78):
The challenge is for midwives, doctors and maternity services to incorporate these recommendations into everyday practice. Communication, collaboration and team work are crucial for success. Managers, clinicians and educators, both medical and midwifery, must work together to foster this team approach; multidisciplinary training can play an important role in achieving this aim.
Some Australian states have implemented specific programs to address some of these recommendations. For example, the NSW Department of Health have recently launched FONT (Fetal, Obstetric Emergency and Neonatal Resuscitation Training) mandatory training for all clinical staff working within Maternity Services in NSW.24 The FONT uses a multidisciplinary approach where medical and midwifery staff receive training together. The King Edward Memorial Hospital for Women in Perth, Western Australia, has six weekly IN TIME (Interdisciplinary Management of Obstetric Emergencies) courses for all medical and midwifery staff to undertake together. The Advanced Life Support in Obstetrics (ALSO25) course also has a focus on postpartum haemorrhage and working in teams. In addition to formalised training sessions, regular drills and in-service updates play an important role in developing and up-dating skills and competence. A focus needs to be on the recognition of maternal collapse and the appropriate management, thereafter the accurate estimation of maternal blood loss should be a priority.
Maternal blood loss is often underestimated which has implications for resuscitation efforts. Weighing pads and liners and measuring obvious blood loss are limited in their capacity to accurately determine blood loss. This underestimation has been shown to become more pronounced the larger the volume of blood lost.26 The importance of improving clinicians’ skills at estimating blood loss cannot be stressed enough. When in doubt haemoglobin should be assessed. A particular challenge is in the immediate post-operative context where women are transferred from the operating theatre back to busy postnatal wards. Without the recognition that the woman has had a significant blood loss appropriate management and resuscitation cannot be commenced either immediately after the birth or later on a postnatal ward.
Conclusion
Midwives and maternity services in all settings have the opportunity, and a responsibility, to learn from maternal deaths in order to reduce both mortality and morbidity for women in the future.
Obstetric haemorrhage is a leading cause of maternal mortality and the management of obstetric haemorrhage requires skilled, multidisciplinary care. All health care professionals caring for pregnant women should be skilled in assessing the risk of intra and postpartum haemorrhage, in the initial management of haemorrhage and be prepared to call for expert help at the earliest opportunity. Postpartum haemorrhage is often a preventable cause of maternal death and strategies to reduce the rate of haemorrhage are essential to implement and evaluate in all settings.
National maternal mortality reporting is an essential aspect of any effective health system and should be maintained at a high standard to ensure that learning can occur. Maternity care providers must understand the process for reporting maternal death in their country and ensure that they take the time to learn from the stories and recommendations.
Acknowledgements
Caroline Homer, Nolan McDonnell, Michael Peek, Elizabeth Sullivan are members of the Education and Training Committee of the AIHW National Advisory Committee on Maternal Mortality (NACMM). We would like to thank Beverly Hall from the AIHW National Perinatal Statistics Unit for her assistance with this paper. We would also like to thank the Confidential Enquiry in Maternal and Child Health (CEMACH) for permission to use the some of the material in this paper.
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PII: S1871-5192(09)00026-2
doi:10.1016/j.wombi.2009.02.002
© 2009 Australian College of Midwives. Published by Elsevier Inc. All rights reserved.
