Effectiveness and safety of steady versus intermittent high dose vitamin D supplementation for the prevention of falls and fractures among adults: a protocol for systematic review and network meta-analysis

Abstract

IntroductionClinical trials and systematic reviews of trials involving vitamin D supplementation have mainly focused on defining the optimal amount of vitamin D dosage. However, the comparative effectiveness of different dosing schedules (ie, daily vs bolus dosing schedule) has been largely unexplored; and currently, there is no consensus regarding the optimal vitamin D dosing schedule. Our objective is to conduct a systematic review and network meta-analysis (NMA) to evaluate the comparative effectiveness and safety of steady (eg, daily, weekly) and intermittent high-dose (eg, monthly, yearly) vitamin D dosing schedules; and to determine the effectiveness of the various dosing schedules and combinations of treatments.Methods and analysisWe will conduct a systematic search and review of literature from major medical databases (MEDLINE, EMBASE, CINAHL, Cochrane Central Register of Controlled Trials and ClinicalTrials.gov) involving studies that compare vitamin D supplementation alone or in combination with calcium. Only randomised controlled trials (RCTs) will be considered. We will, however, consider various settings (eg, community, institutional care) and study designs (eg, cluster RCTs, cross-over trials). Our primary outcomes include falls and fractures including hip-fracture and non-vertebral fractures. Secondary outcomes will include muscle strength, physical performance, gait and mobility limitation. A Bayesian NMA will be conducted, and the results will be presented in the form of treatment effect estimates and ranking probabilities, with corresponding CIs. Pairwise meta-analysis will also be conducted for studies reporting head-to-head comparisons. Subgroup analysis will be performed with respect to pre-determined subgroups; including vitamin D status as measured by serum 25-hydroxyvitamin D levels, age and follow-up time. Sensitivity analysis will also be performed with respect to risk of bias.Ethics and disseminationThis study is a systematic review and meta-analysis of published RCTs; therefore, no ethical approval is required. Results will be disseminated through open access peer-reviewed publications.Systematic review registrationPROSPERO CRD42018112662.

Impact of vitamin D deficiency on mortality in patients with hip fracture: A meta‐analysis

“…The close relationship between 25(OH)D3 levels and albumin also suggests that vitamin D deficiency may have an impact on the overall health of older patients 18 . However, vitamin D supplementation has been found to be effective in preventing hip fractures 30 . Although low 25(OH)D concentration and malnutrition are common in older patients with hip fracture, less is known about their association with functional outcomes 31 …”

“…18 However, vitamin D supplementation has been found to be effective in preventing hip fractures. 30 Although low 25(OH)D concentration and malnutrition are common in older patients with hip fracture, less is known about their association with functional outcomes. 31 Regarding the subgroup analysis, the results suggest that vitamin D insufficiency is associated with a significant increase in mortality at 1 and 2 years of follow-up but not in shorter follow-up periods.…”

Low serum levels of vitamin D significantly increase the risk of death in older adults with hip fractures: a prospective cohort

“…Our results raise the issue of vitamin D replacement. A PubMed search combining (“hip fractures”[MeSH Major Topic]) AND (“vitamin D/administration and dosage”[MeSH Major Topic]) returned 3 articles 26 - 28 . Or et al 26 , in addition to other measures, implemented a protocol for administration of 2000IU of vitamin D/day in patients with 25(OH)D 3 levels above 20ng/mL.…”

“…However, they did not investigate the postoperative period and the demographic and dietary profile of the sample is very specific. Al-Khalidi et al 28 concluded that vitamin D supplementation is effective in the prevention of hip fractures.…”