Avitaminosis A Publications (66423)

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Avitaminosis A Publications

2016Nov
N. Engl. J. Med.
N Engl J Med 2016 Nov;375(19):1817-1820
From the Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston (J.E.M.); the Division of Nutritional Sciences, Cornell University, Ithaca, NY (P.M.B.); the Center for Clinical and Translational Medicine, Maine Medical Center Research Institute, Scarborough (C.J.R.); and the Office of Dietary Supplements, National Institutes of Health, Bethesda, MD (C.L.T.).
2016Sep
Acta Med Iran
Acta Med Iran 2016 Sep;54(9):610-613
Department of Surgery, School of Medicine, Kashan University of Medical Sciences, Kashan, Iran.
1969Dec
Cochrane Database Syst Rev
Cochrane Database Syst Rev 2016 11 9;11:CD008824. Epub 2016 Nov 9.
Departments of Epidemiology and Nutrition, Harvard School of Public Health, 677 Huntington Avenue, Boston, MA, USA, 02115.

Vitamin D is a micronutrient important for bone growth and immune function. Deficiency can lead to rickets and has been linked to various infections, including respiratory infections. The evidence on the effects of supplementation on infections in children has not been assessed systematically. Read More


To evaluate the role of vitamin D supplementation in preventing pneumonia, tuberculosis (TB), diarrhoea, and malaria in children under five years of age. This includes high-, middle-, and low-income countries.
We searched the Cochrane Infectious Diseases Group Specialized Register, the Cochrane Central Register of Controlled Trials (CENTRAL), the Cochrane Library, MEDLINE, EMBASE, LILACS, the WHO International Clinical Trials Registry Platform (ICTRP; http://www.who.int/ictrp/en/) , ClinicalTrials.gov and the ISRCTN registry (http://www.isrctn.com/) up to 16 June 2016.
We included randomized controlled trials (RCTs) that evaluated preventive supplementation of vitamin D (versus placebo or no intervention) in children under five years of age.
Two review authors independently screened the titles and abstracts, extracted the data, and assessed the risk of bias of included trials.
Four trials met the inclusion criteria, with a total of 3198 children under five years of age, and were conducted in Afghanistan, Spain, and the USA. Prevalence of vitamin D deficiency varied widely in these populations (range: 73.1% in Afghanistan, 10 to 12% in USA, and 6.2% in Spain). The included trials evaluated mortality (two trials), pneumonia incidence (two trials), diarrhoea incidence (two trials), hospitalization (two trials), and mean serum vitamin D concentrations (four trials).We do not know whether vitamin D supplementation impacts on all-cause mortality because this outcome was underpowered due to few events (risk ratio (RR) 1.43, 95% confidence interval (CI) 0.54 to 3.74; one trial, 3046 participants, low quality evidence).For pneumonia, episodes of 'radiologically confirmed' first or only episode of pneumonia were little different in the supplemented and unsupplemented group (Rate Ratio: 1.06, 95% confidence interval (CI) 0.89 to 1.26; two trials, 3134 participants, moderate quality evidence), and similarly for children with confirmed or unconfirmed pneumonia (RR 0.95, 95% CI 0.87 to 1.04; one trial, 3046 participants). In these two trials there were no obvious differences between supplemented and unsupplemented children regarding episodes of diarrhoea.In the single large trial from Afghanistan, the trial authors reported that vitamin D supplementation was associated with an increase in repeat episodes of pneumonia confirmed by chest radiograph (RR 1.69, 95% CI 1.28 to 2.21; one trial, 3046 participants), but not reflected in the outcome of confirmed or unconfirmed pneumonia (RR 1.06, 95% CI 1.00 to 1.13; one trial, 3046 participants).For hospital admission measured in one small trial, there was no difference detected (RR 0.86, 95% CI 0.20 to 3.62; one trial, 88 participants; very low quality evidence).The mean serum vitamin D concentrations were higher in supplemented compared to unsupplemented children at the end of supplementation (MD 7.72 ng/mL, 95% CI 0.50 to 14.93; four trials, 266 participants, low quality evidence). These results were driven primarily by two smaller trials with large magnitudes of effect. In the other two bigger trials, serum vitamin D concentrations were elevated in the intervention group for most of the trial duration but not at the end of supplementation. This may be due to time elapsed at measurement from the last dose, incomplete compliance, or increased need of vitamin D with infant age.We did not find any trial that reported on the incidence of TB, malaria or febrile illness, duration of pneumonia, duration of diarrhoea, severity of infection, and cause-specific mortality (due to TB, diarrhoea, or malaria).
Evidence from one large trial did not demonstrate benefit of vitamin D supplementation on the incidence of pneumonia or diarrhoea in children under five years. To our knowledge, trials that evaluated supplementation for preventing other infections, including TB and malaria, have not been performed.

2016Oct
J. Urol.
J Urol 2016 Oct 17. Epub 2016 Oct 17.
Department of Urology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania. Electronic address:

Vitamin D deficiency is often detected during metabolic evaluation in the nephrolithiasis population. Multiple vitamin D repletion protocols exist, although their differing impact on urinary stone formation risk factors is unclear.
Patients with a history of calcium stones and vitamin D deficiency (less than 30 ng/ml) were randomized to receive either 1,000 IU daily or 50,000 IU weekly of vitamin D supplementation for 6 weeks. Read More

Patients completed a pretreatment and posttreatment serum vitamin D level evaluation and 24-hour urine collections to assess the response and any changes in urine stone formation risk parameters.
A total of 21 patients completed the study, including 8 who received 1,000 IU daily and 13 who received 50,000 IU weekly. The 50,000 IU weekly group showed a significant increase in median serum vitamin D levels of 23 ng/ml (135%, p <0.01), while the 1,000 IU daily group showed a nonsignificant median increase of 9 ng/ml (49%, p = 0.12). Post-repletion 24-hour urine analysis demonstrated no significant change in urine calcium between the groups, including a median change of -11 mg (IQR -143-29) in patients receiving 1,000 IU and -16 mg (IQR -42-66) in those receiving 50,000 IU. Between the groups there was no significant difference in the supersaturation of calcium oxalate or calcium phosphate.
High dose and low dose vitamin D repletion had no effect on urine calcium excretion or the supersaturation of calcium salts in known stone formers. The higher dosing regimen, which had superior repletion, may be the optimal protocol in patients with vitamin D deficiency.

2016Nov
Appl Physiol Nutr Metab
Appl Physiol Nutr Metab 2016 Nov 13;41(11):1124-1128. Epub 2016 Jul 13.
a Rabta Hospital, Laboratory of Biochemistry, LR99ES11, 1007 Tunis, Tunisia.

Vitamin D is thought to regulate skeletal muscle function and boost physical performance. The aim of this study was to assess the relationship between vitamin D and physical performance in physically active children. This cross-sectional study included 125 children who practice football as a leisure activity. Read More

Plasma 25-hydroxyvitamin D (25-OHD) was assessed using a chemiluminescence immunoassay method. Vitamin D inadequacy was defined as 25-OHD < 20 ng/mL. Physical performance testing included measurements of muscle strength (maximal isometric contraction), jumping ability (vertical jump, standing broad jump, triple hop test), linear sprint (10 m and 20 m), and agility (9 × 4-m shuttle run). Plasma 25-OHD concentrations were positively correlated with muscle strength (r = 0.539; p < 0.001), vertical jump (r = 0.528; p < 0.001), and standing broad jump (r = 0.492; p < 0.001) but inversely correlated with sprint performance (r = -0.539; p < 0.001). In multivariate analysis models, plasma 25-OHD concentrations were associated with each physical performance parameter independently of age, maturity status, body mass index, fat mass, and protein and calcium intakes. In conclusion, a low plasma 25-OHD level was associated with decreased muscle strength, agility, and jumping and sprinting abilities in physically active children. Vitamin D inadequacy may limit exercise performance. Further research should verify whether correction of vitamin D deficiency enhances physical performance.

2016Oct
J Postgrad Med
J Postgrad Med 2016 Oct-Dec;62(4):260-263
Department of Neurology, Malabar Institute of Medical Sciences, Calicut, Kerala, India.
2016Feb
Paediatr Int Child Health
Paediatr Int Child Health 2016 Feb;36(1):1-3
1 Faculty of Medicine, Department of Pediatrics, Division of Critical Care, University of Ottawa , Ottawa, Canada.
2016Oct
JAMA
JAMA 2016 Oct;316(14):1488-1489
Division of Neurology, Department of Neuroscience, Azienda Ospedaliera Universitaria Integrata of Verona, Verona, Italy.

Vitamin D deficiency is highly prevalent in Indian Kashmir. Many people get injectable vitamin D (600,000 IU/injection). At times, the dose prescribed is far above the permissible limit. Read More

We report 62 patients with malpractice-related vitamin D intoxication, presenting with hypercalcemia and acute kidney injury (AKI).
The diagnosis was made on basis of (1) history of multiple intramuscular vitamin D injections (2) toxic serum levels of 25-OH vitamin D and (3) exclusion of common causes of hypercalcemia (malignancy and hyperparathyroidism). Their presentation was either de novo AKI in 51 (group 1) or acute on top of chronic kidney disease in 11 (group 2).
The mean age was 60 ± 14 vs. 62 ± 13 years, approximate number of vitamin D injections received ranged from 4 to 28 (2.4 - 16.8 million units) vs. 3 to 24 (1.8 - 14.4 million units), mean creatinine at presentation was 3.2 ± 0.9 vs. 4.5 ± 1.1 mg/dL, which decreased to 1.2 ± 0.2 vs. 3.3 ± 1.0 mg/dL, mean serum calcium on admission was 13.7 ± 1.4 vs. 13.6 ± 2.0 mg/dL which decreased to 10.7 ± 1.2 vs. 11.0 ± 1.0 mg/dL on follow-up of 7.2 ± 0.6 months, mean vitamin D level was 313.3 ± 54.8 (range 235 - 375) vs. 303.7 ± 48.4 (range 210 - 375) nmol/L and mean PTH was 18.1 ± 9.6 (range 6.2 - 32) vs. 52.3 ± 12.6 (range 28 - 88) pg/mL in group 1 vs. group 2, respectively. The clinical presentation was weakness, constipation, abdominal pain, nausea, vomiting, anorexia, altered sensorium, and oliguria. The treatment received was intravenous fluids (normal saline) in all in group 1 and in 8/11 in group 2, short course of steroids (prednisolone) in 44, and bisphosphonate in 6.
This is the largest case series of AKI secondary to vitamin D toxicity ever reported.
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