The result suggests that clinical characteristics did not strongly impact the excess of maternal deaths. On the other hand, variables related to hospital care and social determinants of health seem to have an apparent effect. The findings indicate that Covid-19 deaths among pregnant and postpartum women, compared to childbearing age females, are not attributable to other clinical aspects such as comorbidities than the pregnancy itself. Therefore, once there is no stronger than marginal association to comorbidities, we can consider pregnancy an independent risk factor of dying from Covid-19. It requires attention to establish actions to reduce this risk. This situation gets worse when we consider all the problems due to access to health services from those women, which can explain why Brazil keeps the rates at this level.
Since mid-2020, publications on the deaths of pregnant and postpartum women due to Covid-19 in Brazil have alerted to the need to prepare and organize the complete healthcare services network. They focused on ensuring timely access and the adequacy of clinical practices because of the specificities of the disease in the pregnancy-puerperal cycle. Brazil has a maternal mortality ratio compared to countries with average sociodemographic development, according to a composed index of per capita income, average education, and fertility. Given that Brazilian fertility is at a lower level, the social and income inequalities are the elements that explain Brazil's position. High maternal mortality rates are mainly concentrated in countries with a peripheral economy and reveal a severe violation of the right to health. Maternal mortality is a preventable event in more than 90% of cases. It is a determining factor in the increase in poverty and starvation [13].
The more outstanding picture of social inequality plays the central role [14]. Differences among pregnant women's profiles in Brazil and other countries are not unlikely. There is a high occurrence of comorbidities in the country whose etiology involves inflammatory conditions, which are risk factors for complications from Covid-19, such as obesity, hypertension, diabetes and vasculopathies [15]. Social determinants of health strongly influence these chronic conditions. Racial, geographic, and socioeconomic disparities, therefore, require special attention. Social, economic and health policies would be benefitted from consideration of this contextual effect [16].
In developing, as opposed to developed countries, high birth rates and limited resources for healthcare delivery contribute to the increased risk of maternal death due to COVID-19 [17]. Brazil, however, has had a declining birth rate since the 1970s, and poor quality prenatal and obstetrical care have a more powerful explanatory weight. Timely access to adequate obstetric services is essential for patient safety and quality of maternal care [18]. Delay in receiving it is associated with the severity of adverse maternal outcomes. Thadeus & Maine [19] developed a model called "Three Delays" to assess access to obstetric care, broken down into three components or phases: (1) delay in the decision to seek health care; (2) delay in identifying and reaching the appropriate health service; and (3) delay in receiving appropriate care at the right time. Even today, this model is used to explain most maternal deaths and some cases of severe maternal morbidity.
In Brazil, barriers to access obstetric services with specialized complex care, and inadequate monitoring of obstetric complications, persist [20]. It occurs despite the warning that the CDC has issued about COVID-19 increased risk for pregnant and postpartum women to develop into severe forms, requiring hospitalization, intensive care, use of mechanical ventilation, and even premature births [21]. In addition to the impressive number of 2020, over less than six months of 2021, maternal deaths had already surpassed the number reported in the previous year. There are 1442 deaths registered. Of all maternal deaths, 848 (58.9%) are pregnant women, and 594 (41.2%) are postpartum women. It represents more than twice of the previous year [22].
For all these reasons, the COVID-19 pandemic may represent a significant immediate obstacle to Brazils' achievement of SDG by 2030. The excess of maternal mortality and the significant increase in near-miss cases caused by COVID-19, directly or indirectly, put the country in a delicate situation.
Our analysis has limitations. Total mortality data represent data available at the time of research. We recognize that the data can change due to some updates over the next few months. However, even if there is a recovery of maternal death records for the database, maternal deaths pattern is already worrying in the current scenario. Another limitation concerns the low testing performed in Brazil. This limitation prevents us from knowing precisely how many COVID-19 infected pregnant and postpartum women. However, this information does not compromise the estimate calculation we use. The Mortality Odds Ratio has the advantage that we can use it precisely in this type of circumstance, where the population base is unknown. We assume deaths in the general population (in our case, the childbearing age female population) to estimate the odds of factors we considered related to maternal mortality. We also know that there is some imbalance between the age group that concentrates most women who experience pregnancies (between 20 and 29 years old) and the group with the highest prevalence of comorbidities (40 to 49 years old). However, we performed the analyses disregarding pregnancies' order, and we believe this minimizes the potential selection bias.
The situation in Brazil demonstrates the importance of national leadership in confronting the pandemic. It is even more important to recognize the need for long-term global care to improve local public health [23]. High maternal mortality is an indicator of failure in the organization of health services. Moreover, the solution requires the involvement of the international community since it affects global development. This scenario does not repeat itself in other low- and middle-income countries, prolonging the pandemic's impact for all [24]. For this reason, the analysis of excess maternal mortality is a call of action at this point in the pandemic.
That said, we emphasize the need for adequate measures for adequate prenatal, delivery and postnatal care. It is fundamental to prepare the healthcare network so that pregnant and postpartum women do not remain unattended, further aggravating maternal mortality.
We assume that the vaccination performed on pregnant women in the first trimester is adequate to protect pregnant women during the second and third trimesters of pregnancy. Moreover, it is necessary to combine non-pharmacological measures and vaccination. We need to strengthen maternal health care, from access to prenatal care to the regulation of obstetric ICU beds. Prenatal consultations must be qualified, encouraging physical distance measures. We also need to screen pregnant women for respiratory symptoms, distribute good quality masks, adopt universal testing on admission to maternity hospitals with molecular tests (RT-PCR), and provide obstetric care in hospital units with access to ICU beds for moderate cases and ICU beds for severe cases.