Active clinical trials for "Vitamin D Deficiency"

Vitamin D receptors are present and differently expressed in murine endometrium and ovary throughout the estrous cycle , whereas knock-out experiments have shown that vitamin D receptor null mice experience uterine hypoplasia and impaired folliculogenesis. Only few retrospective studies examining the role of vitamin D levels in infertile patients have been published up to date, whereas results are strongly contradictory, with some supporting that maternal vitamin D deficiency is associated with lower pregnancy rates and others demonstrating that vitamin D deficiency does not affect final reproductive outcome. Finally, a recent retrospective study postulated that vitamin D deficiency may negatively affect pregnancy rates with an effect mediated through the endometrium, given that vitamin D deficiency was not correlated with ovarian stimulation characteristics or with markers of embryo quality in this study. In order to examine a potential negative effect of vitamin D deficiency on pregnancy rates, mediated through the endometrium, the aim of the current study was to examine the impact of vitamin D levels on pregnancy rates only in an infertile population undergoing embryo transfer of frozen-thawed embryos.

The aim of this study is to investigate the bioavailability of conventional and vitamin D fortified fish as measured by the increase of the specific hydroxy form by 25(OH)D3.

The purpose of this study is to assess whether all frail elderly admitted with hip fracture has a vitamin D deficiency, and if s-25(OH)D deficiency increases the risk of hip fracture in frail elderly. Frail elderly are defined as being 65 years of age or older, and living in nursing homes or senior housings. The investigators' hypotheses state that: Frail elderly with hip fractures will have a suboptimal level of vitamin D. Frail elderly with hip fractures are more likely to have a suboptimal level of vitamin D than frail elderly without any hip fractures during the last ten years.

The investigators would like to evaluate the effect of serum 25-hydroxy vitamin D level on post-operative short-term functional outcomes after total hip arthroplasty (THA). Hypothesis: Patients with low serum vitamin D level will have less within-patient improvement in pre- to 6 week, 1 year, 2 year and 5 year post THA WOMAC scores, SF-36 scores, and performance-based tests(get up and go test and 2 minute walking test) compared to patients who do not have a low vitamin D levels. Also, Patients with low serum vitamin D level will have a higher rate of postoperative thigh pain or periprosthetic fracture.

Background: Vitamin D plays a key role in calcium absorption in the gut and in skeletal development. Vitamin D deficiency is common, affecting an estimated one billion people worldwide, including developed countries. Vitamin D deficiency causes rickets, the most common non-communicable disease of childhood. Rickets causes poor growth and skeletal deformities and, at its most severe, seizures and death. Recent data suggest that children with rickets have an increased risk for developing diabetes mellitus. Screening for vitamin D deficiency is not commonly done. It is generally diagnosed only after symptoms of rickets have developed. Prevention and treatment is simple and inexpensive. Hence, early detection of vitamin D deficiency through screening would be beneficial. Studies are urgently needed to validate such screening tests. Calcium balance is tightly regulated in the body and calcium loss in the urine (measured by the urine calcium-to-creatinine ratio) is a sensitive indicator of reduced calcium absorption, such as in vitamin D deficiency. Objective and Hypotheses. The objective of this study is to evaluate the urine calcium-to-creatinine ratio as a noninvasive and inexpensive screening test for vitamin D deficiency. Our hypotheses are 1) that the urine calcium-to-creatinine ratio correlates with blood vitamin D levels in infants and toddlers at risk for vitamin D deficiency and 2) that this test can be used to screen for vitamin D deficiency. Potential Impact. A validated screening tool would allow for the detection of vitamin D deficiency before the development of rickets, decreasing the morbidity and mortality of this common disease.

Systemic Lupus Erythematosus (SLE) is a systemic autoimmune disorder. It mainly involves the skin, the joints, the nervous system and the kidney and may be life threatening. SLE is associated with production of autoantibodies and perturbations in regulatory T cells and T helper lymphocytes producing interleukin (IL)-17 (Th17 cells). Treatments include corticosteroids, hydroxychloroquine and immunosuppressive agents. Immunomodulatory effects of vitamin D supplementation in VITRO was recently described, notably the expansion of Treg able to suppress inflammatory responses mediated by CD4+ and CD8+ T cells and the decrease of Th17 cells.

Background/aim: Investigators aimed to investigate the effect of D vitamin levels on Sugammadex and Neostigmine reverse durations in the study. Materials and methods: Eighty patients between 18 and 65 years, with ASA I-III status who were undergoing surgery under general anaesthesia were included the study. All patients were randomly divided into two groups with double blindness and 1.25 (OH) 2 vitamin D, 25 (OH) 2 vitamin D, and calcium levels were measured. At the end of the operation, 2 mg/kg of Sugammadex was administered to one group and Atropine + Neostigmine to the other group. The patients were also divided into two groups as to whether their vitamin D levels were ≥ 30 ng/mL or below. A train of four values was recorded after a hypnotic agent was given at the beginning and throughout the operation. The time to complete the disappearance of response to TOF stimulation was recorded as T0. End of the operation: When 2 responses to TOF stimulation were taken, the following times were recorded until the extubation phase by administering at least 2 mg/kg of Sugammadex or 0.05 mg/kg of Neostigmine 0.05 mg/kg of Atropine per kg of body weight. The time until the TOF value reached 50,70,90% and extubation were recorded.

This study is to assess whether a single oral loading dose of 100,000 IU vitamin D3 prior to allogeneic hematopoietic stem cell transplant (aHSCT) can achieve optimal 25 hydroxy-vitamin D3(25-OH-D3) levels (>75nmol/L) at one month post aHSCT, and maintain adequate levels for at least three months, compared to our standard practice of 2000 IU vitamin D3 daily. 25-OH-D3 levels will be measured prior to vitamin D3 supplementation, and 30 as well as 100 days post vitamin D supplementation. We hypothesize that the intervention will prevent vitamin D insufficiency or deficiency in aHSCT recipients, therefore benefit aHSCT-associated morbidity, including osteoporosis.

To determine the correlation between bioavailable Vitamin D values and euploid status of the embryos in larger size follicles from UAE women undergoing in vitro fertilization procedures.

Interest in vitamin D has seen an unprecedented revival sparked by the finding that vitamin D has pleiotropic effects with an intriguing link to the critically ill patients. The recent VITdAL-ICU RCT found a significant difference in mortality in patients with severe deficiency when high doses of vitamin D supplementation were administered. Vitamin D deficiency is extremely common in patients with chronic liver disease and/or cirrhosis. It seems to be a marker of severity of the disease, but also a possible contributing factor in determining poor outcomes. Design of the study: Observational prospective study. Primary variable end point: Vitamin D at baseline, and POD (post-operative day) 1, 3, 7, 28. Secondary variable end points: ICU length of stay; SAPS 2 and SOFA score at POD 1, 7; Days of mechanical ventilation; Hospital length of stay; Mortality at POD 28; Diagnosed invasive infections; Graft rejection in the first 28 days; Bilirubin and INR at POD 7 and 28. SAFETY. The patient will not undergo to additional procedure during the study and will be asked for consent to treatment of personal data. SAMPLE SIZE. Because of the lack of knowledge in this specific cohort no formal sample was calculated beforehand. The sample size will be defined by one-year clinical activity: about 60 consecutive patients. STATISTICAL ANALYSIS. All statistical analysis and results will be assessed and reported as exploratory analysis. In order to describe the trend over time of the vitamin D levels, descriptive statistics such as mean, median, interquartile range and standard deviation will be evaluated. In addition, 95% confidence intervals for mean and standard deviation will be reported. Comparisons between two temporal observations will be assessed with paired t-test. Any univariate association between factors or covariates, will be explored. Statistical analyses will be done with SAS 9.4,