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    Maternal mortality statistics

     

     

    In the past 20 years while maternal mortality ratios (MMR) have fallen 48% in developed nations and 44% worldwide, the number of maternal deaths in the United States has actually doubled, from a low of 12/100,000 births in 1990 to 28/100,000 in 2013.1,2 At first glance, these numbers may look low, but these increases mean that the US mortality rate during that time has also increased, making it 1 of only 20 nations worldwide, 12 of which are in sub-Saharan Africa, where that has occurred. Currently, the United States has a higher MMR than nations such as Iran, Syria, Ukraine, and Jamaica.3

    According to the Centers for Disease Control and Prevention (CDC), up to half of the maternal deaths in the United States should be preventable.4 If that is true, then we need to ask ourselves, why are these women dying? And who are they? Are there quantifiable differences in risk factors among women of different ages, races, ethnic or social groups or those who live in different locations? And because these answers are critical if our nation is to address the overall problem of maternal mortality effectively, intelligently and efficiently, what is the best way to obtain these data and be assured of their accuracy? 

    Maternal mortality

    The Word Health Organization (WHO) defines maternal mortality/maternal death as, “the death of a woman while pregnant or within 42 days of termination of pregnancy, irrespective of the duration and the site of the pregnancy, from any cause related to or aggravated by the pregnancy or its management (direct or indirect obstetric death), but not from accidental or incidental causes.”2 In these instances, direct deaths are those caused by obstetric complications or any events that may arise from treatment or attempted treatment of these complications. Indirect deaths, on the other hand, are deaths that result from previously existing diseases or diseases that developed during pregnancy which are not caused by the pregnancy, but which are aggravated by it. The maternal mortality ratio is the number of maternal deaths per 100,000 live births.

    Within these broad definitions of maternal mortality, several other distinctions are of value when collecting information about maternal death. For instance, a pregnancy-related death describes the death of a woman from any cause while she is pregnant or within 42 days of the termination of pregnancy. A later maternal death describes the death of a woman of either direct or indirect obstetric causes, more than 42 days but less than 1 year after pregnancy termination. The lifetime risk is the probability that a 15-year-old will eventually die of a maternal cause based on the existing risk of death for her country and the year.

    Seeking to address the causes of maternal death is not a new effort. Currently, in the United States there are 2 national sources for maternal death information. The first is the National Center for Health Statistics (NCHS), which is part of the US Federal Statistical System and is the central resource for official vital statistics about health and health care in the United States. The NCHS determines the number of maternal deaths by using ICD-10 codes assigned according to information found on women’s death certificates.

    The second source is the Pregnancy Mortality Surveillance System (PMSS-MM), which relies on death certificates that have either been marked with a check-box as being pregnancy-related or linked to a birth record or fetal death record registered in the year immediately preceding the maternal death. All marked certificates are reviewed by medical epidemiologists to determine the relation between any linked records, confirm a cause of death and then compile all the information into the overall mortality ratio.4

    Each of these methods, however, does present challenges. States use different death forms and not all of them ask the same questions or identify a pregnancy-related death in the same way. Plus, there is no provision for recording other information that might add clarity to a specific case. Consequently, the number of maternal deaths is significantly under-reported. As the assessment processes have begun to evolve, the MMR has risen, leading to the question of whether numbers of maternal deaths are actually increasing or simply being more accurately reported.4

    NEXT: Maternal Mortality Review Committees

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