Maternal risk factors for birth asphyxia in low-resource communities. A systematic review of the literature

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Abstract
Birth asphyxia (BA) affects millions of newborns annually, especially in low-resource communities. Given that much of the attention to this point has focussed upon secondary prevention, we sought to inform the development of primary prevention strategies for BA in resource-limited settings by identifying maternal risk factors. To this end, we systematically reviewed the MEDLINE, PsychInfo, and EMBASE databases, and identified 38 relevant studies. Upon analysis, we found 12 maternal variables associated with BA, and thematically arranged them into 3 categories: sociodemographic factors (age, literacy, gravidity, parity), health care factors (antenatal care, delivery location), and health status (hypertension, pre-eclampsia, eclampsia, anaemia, antepartum haemorrhage, pyrexia). The factors with the greatest, and/or most consistent influence upon likelihood for BA were: young maternal age (<20 years), limited maternal literacy, insufficient antenatal care, non-hospital delivery, maternal hypertension, and anaemia. We hope our review will assist stakeholders guiding the development of BA-related policies and programmes.

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