View clinical trials related to Vitamin D Deficiency.
Filter by:Hypocalcemia is a frequent adverse event after thyroidectomy. It is usually related to hypoparathyroidism, but preoperative hypocalcemia, hypomagnesemia or vitamin D deficiency contributes to it. This study aims to determine the frequency of vitamin D deficiency or insufficiency in patients submitted to thyroidectomy, to define the risk attributed to vitamin D deficiency to postoperative hypocalcemia, to identify other factors associated to postoperative calcium disorder, and to evaluate the benefit of preoperative treatment of vitamin D deficiency to prevent postoperative hypocalcemia.
The study hypothesis states that giving early enteral Vitamin D supplementation to preterm infants will decrease respiratory morbidity in extremely preterm infants.
Extra-renal sources of 1, 25-dihydroxyvitamin D can be increased to normal serum 1, 25-dihydroxyvitamin D levels in chronic kidney disease patients after administration of high dose 25-hydroxyvitamin D. The investigators observed that 1, 25-dihydroxyvitamin D concentrations were significantly increased after 3 months of omega-3 FA supplementation compared to baseline levels without 25-hydroxyvitamin D administration in dialysis patients. In this study, the investigators hypothesized that omega-3 FA and 25-hydroxyvitamin D supplementations may increase 1, 25-dihydroxyvitamin D concentrations much more compared to 25-hydroxyvitamin D supplementation only in hemodialysis patients with insufficient or deficient 25-hydroxyvitamin D levels.
Vitamin D insufficiency is common globally. Pregnant women, who need an increased supply of this vitamin for the proper development of the fetus, are a significant risk group. The purpose of this study is to examine which factors - education, knowledge from non-professional sources, recommendations from medical staff - influence the use of vitamin D among pregnant women in light of the lack of a clear health policy, and to help formulating guidelines for a new health policy with specific recommendations for vitamin D dosage in pregnancy.
Primary Specific Aim 1: To compare the dose-responsive effects of vitamin D3 supplementations on 25(OH) D, parathyroid hormone (PTH), and serum/urine calcium. Primary Specific Aim 2: To compare the dose-responsive effects of vitamin D3 supplementations on non-invasive vascular measures including pulse wave velocity (PWV), flow-mediated dilation (FMD), carotid arterial compliance (CAC), carotid Intima-Media Thickness (cIMT), and 24-hours Ambulatory Blood Pressure (ABP) monitoring as well as casual BP.
The purpose of this study is to investigate the effect of two different doses of vitamin D3 (2000 IU vs. 4000 IU) on serum 25-hydroxyvitamin D (25OHD) levels in patients with hepatocellular carcinoma on the liver transplant list. The study will help determine the dose of vitamin D3 that is required for patients with liver cancer to reach a normal level of 25OHD in the blood.
Vitamin D (Vit D) status is an emerging risk marker of great interest in cardiovascular disease (CVD). Lower serum levels of Vit D are associated with both cardiac risk factors and prevalent cardiovascular disease. Vit D insufficiency remains very prevalent in free living populations in the United States especially in urban, and multi-ethnic low income Northern cities.To date, prospective randomized trials using Vit D supplementation to modify CVD risk and evaluate outcomes have not been performed. The investigators propose a double-blind, randomized wait-list control trial in subjects with Coronary Artery Disease (CAD) and Vit D deficiency with two specific aims. Specific aim 1 is to measure endothelial function using reactive hyperemia peripheral arterial tonometry (RH-PAT) before and after treatment with Vit D replacement therapy. Specific Aim 2 is to measure levels of inflammation before and after treatment with Vit D replacement therapy. These aims will test the hypotheses that Vit D repletion will improve endothelial function and reduce the levels of detectable inflammation in the plasma of these subjects.
Statins are a class of drugs that are highly effective at lowering cholesterol levels. However, compliance is often limited by symptoms of muscle pain. The investigators would like to study Vitamin-D deficient individuals who also have muscle pain due to statin use. About 1 billion people are estimated to have low or insufficient levels of vitamin D worldwide. Patients with low or insufficient levels of vitamin D may develop muscle disease. The purpose of this study is to identify if these symptoms are associated with vitamin D deficiency, and most importantly, if treatment of vitamin D deficiency can reduce muscle pain that is caused by statin treatment.
The aim of this study is to determine serum sclerostin levels and change in serum sclerostin levels in patients with Vitamin D deficiency treated with calcium and vitamin D. Healthy premenopausal Patients with Vitamin D deficiency diagnosed and routinely treated with calcium and vitamin D will be included in the study. This is an observational study. The serum sclerostin levels will be measured before and after Vitamin D treatment.
This is a feasibility double-blind randomised controlled trial in 32 participants. It evaluates the feasibility of a full trial which will examine the efficacy of weekly supplementation of cholecalciferol (vitamin D3) relative to placebo on the subsequent frequency and severity of objectively-verified symptomatic acute respiratory tract infection, overall and as a proportion of detected colonisations of the upper respiratory tract by 9 of the most common aetiologic viral pathogens.