Association Between Vitamin D Deficiency, Supplementation And T1DM In Children: A Cohort Study

Background

Discuss About The Vitamin D In Pregnancy Lactation In Humans.

This study will be planned to find association among vitamin deficiency, vitamin supplementation and T1DM. It is very necessary to carry out this intervention because fewer studies are existing for association among vitamin deficiency, vitamin supplementation and T1DM. In this cohort study 100 women and 100 children will be recruited. This cohort study will be helpful in identifying exposure-outcome relationship. Influence of socio economic factors and gender on outcome of study will be assessed. Confidentiality will be maintained for identity of women and children. This study will be carried out in two stages. In first stage, data will be collected for vitamin D in pregnant women. In second stage, their children will be assessed for the occurrence of T1DM. Data related to 25OHD levels and vitamin D supplementation will be gathered from records of hospitals. HPLC and glucose strips will be used for estimation of HbA1c and glucose levels in children respectively. SPSS statistical software package version 18.0. will be used for statistical analysis. Potential bias, limitations and confounding factors will be assessed and proper attention will be given to eliminate these factors. This cohort study will establish effect of vitamin D deficiency and vitamin D supplementation on occurrence of TIDM in their children.

Vitamin D plays important role in bone health. Deficiency of vitamin D lead to development of rickets in children and osteomalacia in adults. Deficiency of vitamin D also lead to development of disease like cardiovascular disease, cancer, autoimmune diseases and type 1 and type 2 diabetes mellitus. In the blood samples, vitamin D can be estimated as  25-hydroxy vitamin D (25OHD) which is its metabolite. Hypovitaminosis is a condition associated with vitamin deficiency and it occurs in both pregnant and non-pregnant women. Factors responsible for the occurrence of hypovitaminosis in children are impaired sunlight exposure, obesity and latitude (Holick, 2007). Decline in the 25OHD levels in pregnant women occur with the advanced stages of gestation. Placental barrier is the only delivery source for supply of vitamin D to foetus. It indicates foetus particularly dependent on mother for vitamin D. Vitamin D deficiency in mother can result in different conditions in mothers like pre-eclampsia, gestational diabetes, bacterial vaginosis, pre-term delivery and caesarean section (Ginde et al., 2010). Moreover, vitamin D deficiency in pregnant women can lead to development of conditions such as multiple sclerosis, cardiovascular disease, schizophrenia, certain cancers and other autoimmune diseases such as type 1 diabetes mellitus (T1DM) and lupus in children. It is evident that vitamin D deficiency can occur between 24 – 28 weeks of gestation in women with gestational diabetes. 83 % and 29 % of women with gestational diabetes exhibit 25OHD levels

Aim

Deficiency of vitamin D can lead to impaired metabolism of glucose and insulin. It can lead to reduced energy availability to the foetus. Few of the studies indicated that vitamin D lead to improved insulin sensitivity. management, valid and robust evidence is not available for role of vitamin D in insulin sensitivity. Most likely reason for the development of TIDM in children might be due to reduced levels if vitamin D in the children. Hence, pregnant women should be supplemented with vitamin D. Vitamin D supplementation can lead to improved insulin sensitivity and it can reach to its optimum level due to vitamin D supplementation on the regular basis (Alvarez and Ashraf, 2010)

Vitamin D analysis and its correlation with the different health issues is a challenging task. Challenges associated with the vitamin D are variable actions of vitamin D, ubiquity of vitamin D receptors in the body and predominant nature of vitamin D deficiency. Hence, it is necessity to establish robust relationship among these factors. To establish this relationship cohort study will be planned. Exposure-outcome relationship will be established in this cohort study in women from the Kingdom of Saudi Arabia.        

To reduce occurrence of TIDM in children by supplementation of vitamin D in pregnant women.

To collect data related to vitamin D deficiency in pregnant women.

To collect data related to vitamin D supplementation in pregnant with vitamin D deficiency.

To estimate HbA1c and glucose levels in children.

To establish relationship between vitamin D supplementation and TIDM in the children.

Hypothesis can be stated as :

Vitamin D deficiency in pregnant women can lead to development of T1DM in their children.

Optimum level of supplementation of vitamin D in pregnant women can be helpful in managing TIDM in their children.

In this research, cohort study design will be employed. In this type of study desgn, participants with the same features are being recruited. In this study, both the current and historical cohorts will be recruited. This type of cohort studies can be considered as true prospective studies because in this study data can be collected before the information of the development of disease (Kung, 2007; Stephen et al., 2013). In the proposed study, vitamin D deficiency data in the pregnant women will be collected prior to assessment of TIDM in their children. Common characteristics shared by the participants include pregnant women with vitamin D deficiency and vitamin D supplementation to these women. In the evaluation phase, children int the age group 1 – 4 years will be evaluated and these children will be of the same selected mothers.

Hypothesis

Study will be carried out in two phases like : 1) data collection for pregnant women with vitamin D deficiency from five top hospitals in Kingdom of Saudi Arabia. 2) evaluation of  TIDM development in children of 1 – 4 years of age.

This cohort study can also be considered as population-based study. Longitudinal assessment of exposure-outcome relationship can be evaluated population based cohort studies. Advantages of these studies include : estimation of distribution and prevalence rate of particular variable and elimination of bias (Shen, 2017). In this study, 100 women will be recruited as study subjects and in control group 70 women will be recruited. Data related vitamin D deficiency will be collected from women in the study subjects from 5 hospitals in Kingdom of Saudi Arabia. Women with vitamin D supplementation will be incorporated in the study subject group. Data related to pregnant women will be collected since previous 4 years because development of T1DM will be evaluated in the children of 1 – 4 years of age. Women in the subject group and control group will be between 20 – 35 years of age. In the second phase of the study, 100 children will be selected for the evaluation of development of T1DM. Selected children for assessment of T1DM will be between 1 – 4 years of age. Selected 100 children will be again separated into boys and girls.

Ethical approval is necessary for human based studies and it will be taken from the institute ethical committee. Approval for collection of vitamin D deficiency data will be taken from the dean of selected hospitals. Approval will also be taken from dean of each hospital for data collection for women with vitamin D deficiency. Selected women will be asked to give written informed consent. Confidentiality will be maintained for identity of the women. Children and their parents will be asked to give written informed consent for assessment of T1DM. Children will be allowed to withdraw from the study at their will and such provision will be made at the initiation of the study. 

Data related to vitamin D levels from the hospital will be collected as 25OHD levels. 24 – 28 weeks of gestation will be selected as period for the collection of  25OHD levels data in the recruited pregnant women. Data related to vitamin D supplementation will be categorised with respect to dose, frequency and duration of vitamin D supplementation. Data related to development of T1DM in children will be collected by evaluating blood levels of HbA1c in selected children. HbA1c blood levels will be evaluated and processed using validated methods. Collected blood samples from the children will be processed immediately after collection. HbA1c levels with 6.5 % will be considered as the normal levels. HbA1c levels will be evaluated on regular basis with interval of 3 months for upto 1 year. Estimation of HbA1c will be performed by using standardised method. This method include analysis using high-performance liquid chromatography; auto A1c HA 8140 analyzer. Prior to use of this method for HbA1c analysis, this method will be validated at our research centre (Bennett et a., 2013).

Study Design

Since, HbA1c estimation give accumulated glucose levels, it is not required to estimate HbA1c levels frequently. In addition to the estimation of HbA1c level, fasting and fed conditions glucose levels will be estimated. Glucose strips will be used for the estimation of glucose levels. Pin-prick blood sampling will be used for the estimation of glucose levels (Mukherjee, 2013).

Biological estimations are prone to variability; hence there might be variations in estimation of HbA1c and glucose levels. Hence, for estimation of HbA1c and glucose levels average of three readings will be taken.

Effective analysis and interpretation of data will be achieved by arranging data in both tabular and graphical format. Collected data will be entered in the excel sheet. Collected data will be segregated into respective groups such as study subjects and control participants and male and female children. Data will also be segregated with respect to different time points. Mean and standard deviation will be calculated separately for different groups. Statistical analysis will be performed for each group separately. Statistical data will be presented along with the respective data. This type of the presentation of the data will be helpful in improving clarity of the data and variation can be effectively assessed.

100 women in the study subject group and 70 women in the control group will be optimum for power calculation and statistical analysis. Mean difference in 25OHD in mol/L between study subject group and control will be estimated. This analysis will be helpful in assessing vitamin deficiency. Mean difference in HbAC1 level and glucose level will be estimated between intervention and control group. This analysis will aid assessment of vitamin deficiency and vitamin supplementation on the occurrence of T1DM. SPSS statistical software package version 18.0 (SPSS Inc., Chicago, IL, USA) will be used for statistical analysis. Comparisons among different groups will be carried out by using t test and one-way repeated measures ANOVA whichever is appropriate. Tukey test will be used for post hoc comparisons. Correlations among different variables will be established using Pearson’s coefficients for correlations (Petrie, 2009).

Glucose estimation can be performed by self-monitoring of glucose. Probability of biasness is high in self-monitoring of glucose. Hence, blood glucose determination in children will not be performed by their parents; rather will be performed by healthcare professional. Information related to HbA1c and glucose levels might influence food consumption and lifestyle habits. Alteration in the food consumption and lifestyle can influence HbA1c and glucose levels estimations (Sanghani et al., 2013). Biasness in the data collection will be avoided by not displaying the data to the children and their parents.

Intervention Schedule

It is evident that environmental and behavioural factors have significant impact on 25OHD levels in the pregnant women (Christesen et al., 2012). However, these factors will be considered while selecting pregnant women for incorporating in the study. If this data is not available with the hospitals; these women will be excluded from the study. It has been well established that 25OHD levels remains stable without influence of environmental and behavioural aspects. 25OHD should pass through placental barrier to enter foetus; hence, cord concentration of 25OHD will be considered for the selection of pregnant with vitamin D deficiency (Brannon and Picciano, 2011). It is highly possible that, pregnant women with optimum levels of 25OHD, can supply reduced levels of 25OHD to their foetus. Such women will also be included in the study subjects group. Women from different hospitals will be selected. In such scenario, women in the different hospitals might have been administered with vitamin D with different brands. Different brands of vitamin D can produce different levels of efficacy for maintaining optimum levels of vitamin D. This variable efficiency of vitamin D might produce different effect of occurrence of T1DM in children. This varied effect of vitamin D can lead to variability in the outcome of the study. This variability will be reduced by normalising vitamin D supplements data. It will be helpful in getting robust outcome of the study. It will be achieved by analysis and interpreting data separately for different hospitals. It will be helpful in accurate estimation of the vitamin D supplementation on T1DM occurrence.

In cohort study design, confounding factors can be responsible to disturb exposure and outcome relationship (Bookwala et al., 2011). While selecting children for the assessment of occurrence of T1DM, factors like anti-diabetic medication and insulin will be considered. Glucose and HbA1c levels in the children can be significantly affected by administration of anti-diabetic medication and insulin (Seung-Hyun et al., 2016). Hence, children consuming anti-diabetic medications and insulin will be excluded because these children might have demonstrated reduced levels of glucose and HbA1c. For eliminating this cofounding factor, data related to consumption of medications will be collected for the selected children. After collecting data for medication consumption, data will be again reanalysed and will be incorporated in the original data. T1DM is a complex disease and it can be associated with the other metabolic disorders. It can lead to altered levels of glucose. Hence, this factor will also be considered while analysing and interpreting data (Chillarón et l., 2014). Information about occurrence of other metabolic disease will be collected from the parents. In case of increased levels of glucose and HbA1c in children with other metabolic diseases, these results will be excluded from the study. Exercise and eating habits can also affect significantly glucose levels. Hence, these factors will be considered while analysing and interpreting the data. Severity of T1DM in children will be assessed by observing polyuria, polydipsia, and polyphagia in the children (Kharroubi and Darwish, 2015).

Population Recruitment

Prior to execution of the study, this protocol will be discussed with other healthcare professionals. People with different experience and expertise can have different opinions on the same subject. Hence, questions might be raised during presentation to these healthcare professionals. These questions will be considered and will be incorporated in the protocol.

It is evident form the literature that there is existence of confounding relationship between vitamin D deficiency and T1DM. However, insulin sensitivity can be significantly improved and effective glycaemic control in T2DM patients by vitamin D supplementation (Chih-Chien et al., 2012). However, there is scarcity of evidence for improvement in T1DM condition after supplementation with vitamin D (Svoren et al., 2009). This study will play significant role for validation of vitamin D deficiency for the development of T1DM in children. This study can be useful in validating role of vitamin D deficiency on HbA1c levels on children. It will also be establish role of vitamin D supplements in pregnant women on the development of T1DM in their respective children.

This study will establish difference in glucose and HbA1c levels between the children in the control group and T1DM group. Studies established that little variation exists between the women in vitamin D deficient and non-deficient group for the development of T1DM. It will be interesting to explore whether mother’s trend of T1DM will be translated in their children. Effect of other factors like socioeconomic factors on the occurrence of T1DM will be established in this study. From, the literature it is evident that occurrence of T1DM is more prevalent in low socioeconomic class children as compared to the children of high socioeconomic class children. This difference might be due to less knowledge and awareness of T1DM among low socioeconomic class people. This study will also establish difference between male and female children on the occurrence of T1DM.

This study will be helpful in identifying exact gestation period in which supplementation of vitamin D can be helpful in exhibiting long duration effect in the children. Outcome if this study will be helpful in supporting the concept that estimation of vitamin D during whole gestation period in essential because it can impact pregnant women and children throughout their life. Dose of vitamin D and brand of vitamin D supplement will also be validated in this study because data of different brands will be analysed separately. Effect of age of pregnant women on vitamin D deficiency and women’s response to vitamin D supplementation will be evaluated in this study. In this study, women in the broad range from 20 – 35 years will be recruited.

References:

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