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Effect of Calcium Supplementation during Pregnancy on Pre-eclampsia Prevention in Nigeria

Abstract

Pre-eclampsia remains a major public health concern in Nigeria and is an important cause of maternal and perinatal morbidity and mortality. The condition is characterized by new-onset hypertension during pregnancy and may progress to severe complications such as eclampsia, stroke, placental abruption, preterm birth, fetal growth restriction, organ dysfunction, and maternal or neonatal death. Inadequate dietary calcium intake has been associated with an increased risk of hypertensive disorders of pregnancy, particularly among pregnant women with low calcium intake. Calcium supplementation during pregnancy provides an opportunity to improve maternal calcium intake and may contribute to the prevention of pre-eclampsia, especially when supplementation is provided to women at increased risk or with inadequate dietary calcium intake. However, limited awareness, inadequate antenatal care attendance, poor adherence to supplementation, inconsistent availability of calcium supplements, and financial and healthcare access barriers may reduce the effectiveness of calcium supplementation programmes in Nigeria. Against this background, this study investigates the effect of calcium supplementation during pregnancy on pre-eclampsia prevention in Nigeria. The study will be anchored on the Health Belief Model, Social Ecological Model, and Health Systems Framework. The Health Belief Model explains how pregnant women's perceptions of susceptibility to pre-eclampsia, perceived severity, perceived benefits of calcium supplementation, perceived barriers, and cues to action may influence adherence to supplementation. The Social Ecological Model emphasizes the influence of individual, household, community, healthcare, nutritional, socioeconomic, and policy factors on maternal nutrition and pregnancy outcomes. The Health Systems Framework emphasizes antenatal service delivery, health workforce, availability of supplements, health information, financing, governance, and accessibility as essential components of effective maternal nutrition and pre-eclampsia prevention programmes. Collectively, these theoretical perspectives provide a suitable framework for explaining how calcium supplementation may influence pre-eclampsia prevention among pregnant women in Nigeria. The study will adopt a quantitative analytical cohort or quasi-experimental research design. The study population will comprise pregnant women receiving antenatal care in selected healthcare facilities across Nigeria. A multistage sampling technique will be used to select states, local government areas, healthcare facilities, antenatal clinics, and eligible pregnant women. Calcium supplementation during pregnancy will be assessed using indicators such as receipt of calcium supplements, timing of supplementation initiation, dosage, duration, adherence, frequency of use, availability of supplements, dietary calcium intake, antenatal nutritional counselling, and documentation of supplementation. Pre-eclampsia prevention will be assessed using indicators such as development of new-onset hypertension, proteinuria or other clinically relevant features, gestational age at diagnosis, severity of hypertensive disease, referral, hospitalization, and other maternal and pregnancy outcomes. Maternal blood pressure and relevant laboratory findings will be obtained from clinical records where available. Data will be collected using structured questionnaires, antenatal care records, maternal medical records, supplement prescription or distribution registers, dietary assessment tools, blood pressure records, laboratory reports, and maternity records. Descriptive statistics will be used to summarize maternal characteristics, calcium supplementation patterns, dietary intake, adherence, and hypertensive pregnancy outcomes. Inferential statistical techniques, including chi-square tests, t-tests, correlation analysis, and logistic or multiple regression analysis where appropriate, will be used to determine the effect of calcium supplementation on pre-eclampsia prevention. Where a cohort or quasi-experimental design is adopted, the incidence of pre-eclampsia among women receiving appropriate calcium supplementation may be compared with that among women receiving inadequate or no supplementation, while relevant maternal, nutritional, socioeconomic, and pregnancy-related factors are appropriately controlled. Diagnostic tests will also be conducted to assess the reliability, validity, and robustness of the findings. The study is expected to find that appropriate calcium supplementation during pregnancy has a significant protective effect against pre-eclampsia among pregnant women in Nigeria, particularly among women with low dietary calcium intake or increased risk of hypertensive disorders of pregnancy. Women who receive and adhere to appropriate calcium supplementation are expected to have a lower likelihood of developing pre-eclampsia than women with inadequate or no supplementation. Calcium supplementation may support normal vascular and neuromuscular function and contribute to improved regulation of blood pressure during pregnancy. However, the effectiveness of supplementation may be influenced by maternal dietary intake, adherence, gestational age at initiation, pre-existing hypertension, previous history of pre-eclampsia, maternal age, obesity, multiple pregnancy, and other pregnancy-related factors. Poor access to antenatal care, limited availability of calcium supplements, inadequate nutritional counselling, and poor adherence may reduce the potential benefits. The study therefore expects appropriately targeted calcium supplementation, combined with quality antenatal care and routine blood pressure monitoring, to contribute significantly to pre-eclampsia prevention in Nigeria. The study is expected to contribute to the literature on calcium supplementation, pre-eclampsia prevention, hypertensive disorders of pregnancy, maternal nutrition, antenatal care, maternal health, pregnancy outcomes, and public health in Nigeria. The findings will provide useful information to the Federal Ministry of Health and Social Welfare, National Primary Health Care Development Agency, state ministries of health, healthcare facilities, maternal health programmes, obstetricians, midwives, nutritionists, community health workers, development partners, and policymakers regarding strategies for strengthening maternal nutritional interventions. The study will also provide evidence-based recommendations for improving access to calcium supplementation, strengthening antenatal nutritional counselling, promoting adherence to supplementation, identifying pregnant women with inadequate dietary calcium intake, integrating calcium supplementation with antenatal care, strengthening pre-eclampsia screening and blood pressure monitoring, and incorporating evidence-based maternal nutrition interventions into broader maternal and newborn health programmes across Nigeria.

Keywords: Calcium supplementation, pre-eclampsia prevention, pregnancy, maternal nutrition, hypertensive disorders of pregnancy, antenatal care, maternal health, blood pressure, pregnancy outcomes, Nigeria, public health.