Supplementation of Vitamin B12 in Pregnancy and Postpartum on Growth and Cognitive Functioning in Early Childhood: A Randomized, Placebo Controlled Trial
试验速览
- 阶段
- 2 期
- 状态
- 进行中（未招募）
- 发起方
- 入组人数
- 800
- 试验地点
- 2
- 主要终点
- Length
研究概览
简要总结
Scientific basis: Globally, vitamin B12 deficiency is one of the most common micronutrient deficiencies. The only relevant source of vitamin B12 is animal-source foods and poor gut function may decrease absorption. Vitamin B12 is crucial for normal cell division and differentiation, and necessary for the development and myelination of the central nervous system. Deficiency is also associated with impaired fetal and infant growth. In the proposed study we will measure the effect of daily oral vitamin B12 supplementation to pregnant women on neurodevelopment and growth of their children. We also aim to measure the impact of B12 supplementation on several other outcomes.
Study design: Individually randomized double-blind placebo controlled trial in pregnant South Asian women at risk of poor vitamin B12 status. Participants will be randomized in a 1:1 ratio.
Study participants and site: 800 pregnant women from early pregnancy. Women will be enrolled as early as possible, but no later than in week 15 of pregnancy.
Intervention: Daily administration of 50 µg of vitamin B12 from early pregnancy until 6 months after birth.
Comparator: Placebo, identical to the vitamin B12 supplements.
Outcomes: Primary: (i) neurodevelopment in children measured at 6 and 12 months of age (ii) growth in children measured by weight and length at 12 months. Secondary: (i) neurodevelopment and cognitive functioning in children at 24 months (ii) gestational age at birth, (iii) fetal and infant growth measured by weight and length at birth, after 1 month and then at 3, 6, 9, and 24 months, (iv) hemoglobin concentration in children and mothers.
Relevance for programs and public health: The results from this study can suggest new dietary guidelines for South Asian women that again can lead to improved pregnancy outcomes and neurodevelopment and cognitive functioning in South Asian children.
详细描述
Cobalamin (Vitamin B12) deficiency is common in many low- and middle-income countries. This is not surprising as the main source of vitamin B12 is animal source foods, which are expensive and for cultural and religious reasons often not eaten at all. We have in several studies in women and children demonstrated that poor vitamin B12 status is common in South Asia. There is also compelling evidence that vitamin B12 deficiency occurs frequently in many other settings including pregnant women .
Case studies have demonstrated harmful effects of severe vitamin B12 deficiency on the developing infant brain.The consequences of mild or subclinical vitamin deficiency are less clear but it has been shown to be associated with decreased cognitive performance in both elderly and children.
Three randomized controlled trials (RCT) have measured the effect of vitamin B12 supplementation on neurodevelopment in children: In a Norwegian trial, an intramuscular injection of B12 substantially improved motor development in six weeks old infants after one month. Another intervention study in low birth weight children in Norway recently confirmed these findings. The infants in these studies had evidence of suboptimal vitamin B12 status, but none were severely deficient. We found a beneficial effect of vitamin B12 supplementation for six months on neurodevelopment in young North Indian children.
During pregnancy, vitamin B12 is concentrated in the fetus and stored in the liver. Infants born to vitamin B12-replete mothers have stores of vitamin B12 that are adequate to sustain them for the first several months postpartum. Consequently, vitamin B12 deficiency rarely occurs before the infant is about four months old if the mother has adequate vitamin B12 status during pregnancy. However, many infants of vitamin B12-deficient breastfeeding mothers are vulnerable to B12 deficiency from an early age.
In this project we will randomise Nepalese women to receive a supplement containing 50µg cobalamin or a placebo from early pregnancy until 6 months postpartum.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
盲法说明
We will randomize women in a 1:1 ratio. The vitamin B12 supplements and the placebos will be produced specifically for this trial and be identical in taste and appearance. Each woman will be assigned a packet of medicines according to her id number. This packet will only be labeled with general information about the study and a unique id number. The list that links the id number to the randomization code will be kept with the company that produces the intervention and the placebo, and with the scientist who will generate the randomization code. This scientist will otherwise not be involved in the study. None of the investigators will have access to this list until completion of data collection and cleaning of data for the main outcomes.
入排标准
- 年龄范围
- 20 Years 至 40 Years（Adult）
- 性别
- Female
- 接受健康志愿者
- 否
入选标准
- •Pregnant mother in early pregnancy and not later than 15 weeks of pregnancy.
- •Current resident and plan to reside in Bhaktapur district for at least the next 2 years.
- •Age of mother between 18 and 40 years.
- •Consent to participate in the study.
排除标准
- •Taking or plan to take dietary or multivitamin supplements containing vitamin B
- •Known case of chronic disease like asthma, tuberculosis, diabetes, hypertension, hypo or hyperthyroidism or others
- •Known case of current high risk pregnancy
- •Severe anemia (hemoglobin concentration <7 g/dL).
- •Where the study doctor finds it necessary to treat the woman with vitamin B12 or vitamin B12 containing supplements
结局指标
主要结局
Length
时间窗: 12 months of age
Length measured in centimeters and expressed as z-scores
Neurodevelopment
时间窗: measured 6 and 12 months of age
Cognitive composite score of the Bayley Scales of Infant and Toddler Development, 3rd ed. (Bayley-III)
次要结局
- The Infant Motor Performance(2 months after birth)
- Children born at small for gestational age(Birth)
- High birth weight(Birth)
- Sleep and activity(12 first months of life)
- Number of complicated births(Birth.)
- Low birth weight(Birth)
- Very low birth weight(Birth)
- Maternal hemoglobin concentration(at end of pregnancy and 6 and 12 months post party.)
- Birth weight(Birth)
- Child hemoglobin concentration(measured 6 and 12 months of age)
- Child development ASQ(12 first months of life)
- Child development Bayley(measured 6 and 12 months of age)
- Heart rate variability(12 first months of life)
- Still births(Birth.)