Levels and Causes of Maternal Mortality and Morbidity

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Levels and Causes of Maternal Mortality and Morbidity Chapter 3 Levels and Causes of Maternal Mortality and Morbidity Véronique Filippi, Doris Chou, Carine Ronsmans, Wendy Graham, and Lale Say INTRODUCTION any cause related to or aggravated by the pregnancy or its management, but not from accidental or incidental In September 2000, 189 world leaders signed a declara- causes” (WHO 2010, 156). Subsequent guidance on the tion on eight Millennium Development Goals (MDGs) classification of causes includes nine groups of underly- to improve the lives of women, men, and children in their ing causes (box 3.1) (WHO 2012). respective countries (United Nations General Assembly Despite the increased global focus on maternal mor- 2000). Goal 5a calls for the reduction of maternal mor- tality as a public health issue, little detailed knowledge tality by 75 percent between 1990 and 2015. Goal 5a was is available on the levels of maternal mortality and supplemented by MDG 5b on universal access to contra- morbidity and the causes of their occurrence. A large ception. MDGs 5a and 5b have been important catalysts proportion of maternal deaths occur in settings in which for the reductions in maternal mortality levels that have vital registration is deficient and many sick women do 1 been achieved in many settings. not access services. To obtain data on population levels Despite substantial progress, challenges remain. The of maternal mortality in these settings, special surveys majority of low-income countries (LICs), particularly are needed, including the following (Abouzahr 1999): in Sub-Saharan Africa and postconflict settings, have not made sufficient progress to meet MDG 5a. The • Reproductive Age Mortality Studies, which investi- post-2015 agenda on sustainable development is broader gate all reproductive age deaths than the MDG agenda, with a greater number of • Demographic and Health Surveys, which interview nonhealth goals and a strong focus on inequity reduc- women and men about their siblings’ survival in tion; the new agenda includes an absolute reduction in adulthood to identify deaths of sisters during or maternal mortality as a marker of progress.2 This new following pregnancy (the siblings are from the same indicator is expected to be framed as targets for prevent- mother) (Ahmed and others 2014) able maternal deaths (Bustreo and others 2013; Gilmore • Smaller studies, which use the indirect sisterhood and Camhe Gebreyesus 2012). method The International Classification of Diseases (ICD-10) • National investigations, which add questions to defines maternal death as “[The] death of a woman while censuses pregnant or within 42 days of the end of pregnancy, irre- • Verbal autopsy studies, which provide information spective of the duration and site of the pregnancy, from on causes and circumstances of deaths. Corresponding author: Véronique Filippi, London School of Hygiene & Tropical Medicine, [email protected]. 51 nature and incidence of many indirect complications Box 3.1 that are aggravated by pregnancy. For example, reliable population-based estimates of the occurrence of asthma Underlying Causes of Maternal Deaths during pregnancy do not exist in LICs. This chapter addresses the extent and nature of mater- • Pregnancies with abortive outcome nal mortality and morbidity and serves as a backdrop to • Hypertensive disorders subsequent chapters on obstetric interventions in LICs. • Obstetric hemorrhage It introduces the determinants of maternal mortality • Pregnancy-related infection and morbidity and their strategic implications. The next • Other obstetric complications section uses the most recent estimates from the World • Unanticipated complications of management Health Organization (WHO) to show that women face • Nonobstetric complications a higher risk of maternal death in Sub-Saharan Africa. • Unknown or undetermined It discusses the recent findings of a WHO meta-analysis • Coincidental causes that show that the most important direct causes are hem- orrhage, hypertension, abortion, and sepsis; however, the Source: WHO 2012. proportion of deaths due to indirect causes is increasing in most parts of the world. The chapter then focuses Maternal death studies require large sample sizes; on pregnancy-related complications, including nonfatal recent national-level data are often nonexistent, and illnesses such as antenatal and postpartum depression, maternal mortality tracking relies principally on mathe- using the findings from systematic reviews conducted by matical models. This lack of data has led to a repeated call the Child Health Epidemiology Reference Group. The for countries to improve their vital registration systems most common contributors to maternal morbidity are and to strengthen other mechanisms for informing inter- probably anemia and depression at the community level, vention strategies, such as the maternal death surveillance but prolonged and obstructed labor results in the highest and response system proposed within the new account- burden of disease because of fistulas (IHME 2013). The ability framework (WHO 2013). Accountability remains chapter discusses the broader determinants of maternal a central part of United Nations Secretary General Ban morbidity and mortality, and then concludes by making Ki-Moon’s updated global strategy to accelerate progress the links with the interventions highlighted in chapter 7 for women’s, children’s, and adolescent’s health (http:// in this volume (Gülmezoglu and others 2016). www.everywomaneverychild.org / global-strategy-2). The accountability framework, developed under the 2010 MATERNAL MORTALITY LEVELS global strategy to accelerate women’s and children’s AND TRENDS health, included recommendations for improvements The WHO, in collaboration with the United Nations in resource tracking; international and national over- Children’s Fund, the United Nations Population sight; and data monitoring, including maternal mortality Fund, the World Bank Group, and the United Nations (Commission on Information and Accountability for Population Division, publishes global estimates of Women’s and Children’s Health 2011). maternal mortality, which are excerpted in this chapter Information on maternal morbidity is frequently col- (WHO 2015). A complete description of the method- lected in hospital studies, which are only representative ology and underlying data and statistical model can be of patients who seek care. Community-based studies are found in the publication and online.3 In this chapter, rare in LICs and suffer from methodological limitations, the latest estimate is for 2015. Whenever an estimate particularly when they rely on self-reporting of obstetric includes trend data between two points, updates of complications. Self-reporting is known not to agree suf- those estimates typically supersede previously published ficiently with medical diagnoses to estimate prevalence. figures. Readers are directed to the WHO’s Reproductive In particular, studies validating retrospective interview Health and Research web page on maternal mortality to surveys find that women without medical diagno- access the latest published data.4 ses of complications during labor frequently reported symptoms of morbidity during surveys, a phenome- non that can lead to an overestimation of prevalence Maternal Mortality Ratio Levels and Trends, 1990–2015 (Ronsmans and others 1997; Souza and others 2008). Globally, the total number of maternal deaths In addition, community-based studies have focused on decreased by 43 percent from 532,000 in 1990 to 303,000 direct obstetric complications; little is known about the in 2015. The global maternal mortality ratio (MMR) 52 Reproductive, Maternal, Newborn, and Child Health declined by 44 percent, from 385 maternal deaths per (242 per 100,000) is 14 times higher than that in 100,000 live births in 1990 to 216 in 2015—an average high-income countries (HICs, as defined by the World annual decline of 2.3 percent (WHO 2015). Bank (17 per 100,000). Most maternal deaths occur in All MDG regions experienced a decline in the MMR MDG regions Sub-Saharan Africa (201,000) and South between 1990 and 2015. The highest reduction was in Asia (66,000). Sub-Saharan Africa alone accounts for Eastern Asia (72 percent), followed by Southern Asia 66 percent of maternal deaths and has the highest MMR, (67 percent), South-Eastern Asia (66 percent), Northern at 546 maternal deaths per 100,000 live births. By MDG Africa (59 percent), Oceania (52 percent), Caucasus region, Eastern Asia has the lowest rate among developing and Central Asia (52 percent), Latin America and the regions, at 27 maternal deaths per 100,000 live births. Of Caribbean (50 percent), Sub-Saharan Africa (45 percent), the remaining developing regions, four had low MMRs: and Western Asia (43 percent). Although the Caucasus and Caucasus and Central Asia (33), Northern Africa (70), Central Asia experienced a relatively low level of decline, its Western Asia (91), and Latin America and the Caribbean already low MMR of 69 maternal deaths per 100,000 live (67). Three had moderate MMRs: South-Eastern Asia births in 1990 suggests that a different set of more finely (110), Southern Asia (176), and Oceania (187). The adult tuned strategies might be required to respond to the chal- lifetime risk of maternal mortality—the probability that lenge of achieving the same rate of decline as other regions a 15-year-old woman will die eventually from a maternal with higher 1990 MMRs, with possibly a stronger focus on cause—in Sub-Saharan Africa is the highest at 1 in 36; improved
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