Bilateral Medullary Nephrocalcinosis Secondary to Vitamin D Toxicity: A 14-year Follow-up Report

Nephrocalcinosis in children who received high-dose vitamin D

BACKGROUND

Vitamin D supplements are readily available as over-the-counter preparations. However, although rare, cases of vitamin D overdose still occur and are associated with nephrocalcinosis and life-threatening hypercalcemia. Errors in manufacturing of nutritional supplements may be a cause of vitamin D intoxication in children. This study aimed to identify factors associated with vitamin D overdose-related nephrocalcinosis in children due to manufacturing errors in supplements.

METHODS

This retrospective study reviewed medical charts of pediatric patients with non-registered supplement-related vitamin D overdose at a tertiary referral hospital between 2006 and 2011. Clinical and laboratory characteristics of patients with or without nephrocalcinosis were evaluated. Receiver operating characteristics curve and area under the receiver operating characteristics curve were used to determine the most predictive value of each characteristic.

RESULTS

A total of 44 patients (males: 29; age: 7-62 months) were included. Age ≤ 16.5 months, body weight ≤ 10.25 kg, body height ≤ 78.5 cm, body surface area (BSA) ≤ 0.475 m², 25-hydroxyvitamin D₃ ≥ 143 ng/mL, and calcium ≥ 10.65 mg/dL were predictive of developing nephrocalcinosis with a sensitivity and specificity of > 60%. Univariant analysis revealed that BSA was the most significant anthropometric prognostic factor (odds ratio: 12.09; 95% confidence interval: 2.61-55.72; P = 0.001).

CONCLUSIONS

Children with smaller BSAs were more vulnerable to high-dose vitamin D₃-related nephrocalcinosis. Physicians and parents should be aware of the potential adverse effects of vitamin D overdose in children. A higher resolution version of the Graphical abstract is available as Supplementary information.

Early-Onset Osteoporosis

Osteoporosis is a skeletal disorder with enhanced bone fragility, usually affecting the elderly. It is very rare in children and young adults and the definition is not only based on a low BMD (a Z-score < - 2.0 in growing children and a Z-score ≤ - 2.0 or a T-score ≤ - 2.5 in young adults) but also on the occurrence of fragility fractures and/or the existence of underlying chronic diseases or secondary factors such as use of glucocorticoids. In the absence of a known chronic disease, fragility fractures and low BMD should prompt extensive screening for secondary causes, which can be found in up to 90% of cases. When fragility fractures occur in childhood or young adulthood without an evident secondary cause, investigations should explore the possibility of an underlying monogenetic bone disease, where bone fragility is caused by a single variant in a gene that has a major role in the skeleton. Several monogenic forms relate to type I collagen, but other forms also exist. Loss-of-function variants in LRP5 and WNT1 may lead to early-onset osteoporosis. The X-chromosomal osteoporosis caused by PLS3 gene mutations affects especially males. Another recently discovered form relates to disturbed sphingolipid metabolism due to SGMS2 mutations, underscoring the complexity of molecular pathology in monogenic early-onset osteoporosis. Management of young patients consists of treatment of secondary factors, optimizing lifestyle factors including calcium and vitamin D and physical exercise. Treatment with bone-active medication should be discussed on a personalized basis, considering the severity of osteoporosis and underlying disease versus the absence of evidence on anti-fracture efficacy and potential harmful effects in pregnancy.

Vitamin D Toxicity Managed with Peritoneal Dialysis

Vitamin D deficiency is a global health issue that afflicts more than one billion children and adults worldwide. Vitamin D supplementation has increased over the years, whether through medical prescriptions, over-the-counter, or online purchasing. This is driven by a more recognized association between vitamin D sufficiency status and lower risk of cancer. In addition, more recently, it is used as a potential prophylactic and treatment for COVID-19 infection. This can lead to toxicity from overingestion. While rare, it has been reported in the literature. In this case report, we present a 75-year-old man with severe hypercalcemia secondary to vitamin D toxicity managed with peritoneal dialysis. He presented with biochemical evidence of hypercalcemia, acute kidney injury, and pancreatitis. Workup for his hypercalcemia led to the diagnosis of vitamin D toxicity as shown by a level greater than 200 ng/dL (Ref: 20-50 ng/mL) was confirmed by liquid chromatography-mass spectroscopy. Cornerstone medical management of hypercalcemia was provided which included aggressive intravenous fluid hydration, intravenous diuretics, calcitonin, bisphosphonate, and corticosteroid therapy. At every interruption of therapy, calcium levels trended upward. A thorough literature review yielded the finding of a sole case report from 1966 presented at the Third International Congress of Nephrology, in which peritoneal dialysis was used in the management of vitamin D toxicity and hypercalcemia. This modality is established to cause vitamin D deficiency. In collaboration with the nephrology team, 10 sessions of peritoneal dialysis were undertaken with resolution of hypercalcemia and downtrend in 25-hydroxyvitamin D levels as measured by dilution.

Development and testing of a new electronic foot health promotion programme on nurses' foot self-care

Background

Nurses form the largest professional group in health care, and they spend most of their working day on their feet. From the perspective of work well-being, healthy feet are important to tolerate the physical demands of nursing work. However, little is known about how nurses’ foot self-care practices can be promoted with computerised interventions. The aim of this study was two-fold: to explore the preliminary effects of the electronic Foot Health Promotion Programme (FHPP) on foot self-care in nurses and to examine the usability of the programme.

Methods

A single group pretest-posttest design was used. The FHPP was targeted at nurses working in the operating theatre. The FHPP lasted for 4 weeks and focused on improving nurses’ knowledge and awareness of foot self-care through self-directed learning tasks. The primary outcome was knowledge of foot self-care. The secondary outcomes were foot health and work ability. Thirty-seven participants completed the study. The outcomes were assessed at baseline (April–June 2017) and 4 weeks (August–September 2017) after the intervention ended. The data were analysed statistically.

Results

Participants’ knowledge of foot self-care and foot health improved; however, the changes were not statistically significant. The FHPP was considered to be usable and has potential as a tool to increase knowledge of foot self-care among nurses.

Conclusions

The FHPP developed in this study is a newly developed potential tool to increase nurses’ knowledge of foot self-care. Application of the FHPP as part of occupational health care may enhance nursing personnel’s foot self-care and lower extremity health.

Trial registration

ClinicalTrials.gov NCT03116451, 17.4.2017.

Changing Trend in Vitamin D Status from 2008 to 2016: An Experience from a Tertiary Care Institute in North India

BACKGROUND

Serum 25-hydroxyvitamin D (25(OH)D) assays have become readily available in India over the past decade. A large number of cross-sectional studies have been performed on the vitamin D status and the prevalence of vitamin D deficiency (VDD) in India. However, seasonal and long-term trends in serum 25(OH)D levels have been reported less frequently.

AIM

To determine the seasonal and year-wise variation in vitamin D status at a tertiary care hospital in north India.

MATERIALS AND METHODS

Using hospital records, the data on serum 25(OH) D assays performed in its endocrinology laboratory between 2008 and 2016 were obtained. For analysis of seasonal trends, the months of a year were divided into following seasons: March to June (summer season), July to October (rainy season), and November to February (winter season). VDD was defined as serum 25(OH)D concentration <20 ng/mL.

RESULTS

A total of 26,339 assays of serum 25(OH)D were analyzed in the study. The year-wise assay numbers increased steadily from 2008 to peak in the year 2012, followed by a decline and a second smaller peak in the year 2016. The mean serum 25(OH)D concentration increased from 19.1 ± 16.4 ng/mL in 2008 to 21.7 ± 17.1 ng/mL in 2016 (P = 0.02). Between 2008 and 2016, the prevalence of VDD decreased from 71.9% to 54.3% in females, and from 56.7% to 52.1% in males. The levels in rainy season were significantly higher as compared to winters and summers (P < 0.05 for both). Hypervitaminosis D (serum 25(OH)D >100 ng/mL) and vitamin D toxicity (serum 25(OH)D >150 ng/mL) were seen in 319 (1.2%) and 27 (0.1%) assays, respectively.

CONCLUSIONS

This study provides data on seasonal and year-wise trends in vitamin D status over a long period of time at a tertiary care hospital in north India. A long-term trend toward improving vitamin D status, especially in females, was noted in the study. The prevalence of VDD was found to decrease in the analyzed samples during the study period.

Preventative and early intervention diabetes-related foot care practices in primary care

The aim of this study was to identify current preventative and early intervention diabetes-related foot care practices among Australian primary care healthcare professionals. A survey was developed to obtain information about preventative and early intervention foot care actions, priorities of care, access and referral to expert multidisciplinary foot care teams and adherence to best-practice diabetes-related foot care recommendations. The survey was distributed to GPs and Credentialled Diabetes Educators (CDEs). Surveys were completed by 10 GPs and 84 CDEs. Only 45% of all respondents reported removing the shoes and socks of their patients with diabetes at a consultation. Eighty-one percent of participants reported having access to specialist multidisciplinary foot care teams. Those in urban settings were significantly more likely to report access than those in rural areas (P=0.04). Median scores indicated that participants did not often utilise specialist teams to refer patients with diabetes-related foot ulceration and Charcot’s neuroarthropathy. Only 16% of participants reported having access to specialist foot care telehealth services; patients with diabetes-related foot ulceration and Charcot’s neuroarthropathy were rarely referred to these services. This study is the first Australian study to elicit information about preventative and early intervention diabetes-related foot care practices by GPs and CDEs working in Australian primary care. In the presence of acute diabetes-related foot complications, primary healthcare practitioners are not always adhering to best practice foot care recommendations. Further studies are required to understand the reasons for this and ensure evidence-based best practice foot care delivery to people with diabetes.