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Vitamin D insufficiency in older female community-dwelling acute hospital admissions and the response to supplementation

Abstract

Objectives:

A significant proportion of the older population may exhibit vitamin D insufficiency. We sought to establish the proportion of 25-hydroxyvitamin D (25OHD) insufficient individuals in an older female cohort presenting for acute medical admission and how they responded to supplementation.

Design:

A prospective cohort study.

Setting:

Hospital admissions followed up as a population-based study.

Subjects:

A total of 114 consecutive female acute medical admissions aged over 65 years from November 2003 to January 2004 were enrolled. All admissions with hypercalcaemia, metabolic bone disease (other than osteoporosis/osteomalacia) and creatinine >150 μmol/l were excluded.

Interventions:

iPTH, calcium and 25OHD levels were measured in each patient. Of the total, 22 were already receiving calcium and vitamin D supplementation at enrolment. The remaining 92 were commenced on 800 IU of vitamin D and 1 g calcium, and levels were reassessed after supplementation for 3 months.

Results:

25-Hydroxyvitamin D insufficiency, as defined by a 25OHD concentration of <50 nmol/l, was present in 86 (75.4%) patients at initial assessment (mean 35.8 nmol/l, s.d. 23.3). Secondary hyperparathyroidism was present in only 36.7% of those with 25OHD deficiency at baseline. Of the total, 51 (44.7%) patients presented for follow-up. 25-Hydroxyvitamin D concentration increased in this group from 42.1 nmol/l (s.d. 26.6) to 59.5 nmol/l (s.d. 27.4) after supplementation, P<0.001, but 18(35.3%) still remained deficient. There was no significant change in iPTH or calcium following supplementation. Assessment of compliance revealed 6 (11.7%) admitted to partial or non-compliance.

Conclusions:

Insufficiency of 25OHD was very common in this cohort. Despite calcium and vitamin D supplementation, 25OHD concentrations failed to reach normality in a significant proportion. Maintaining vitamin D and calcium intake at the level of current recommended doses may not be sufficient to ensure adequate 25OHD stores.

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Correspondence to E DeLappe.

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Guarantor: E DeLappe.

Contributors: EM, CM, NniC and HG conceived and designed the study. CM, EM and ED conducted the study. NniC and HG carried out laboratory analysis. ED analysed and interpreted the data and wrote the article. TOB, HG and EM carried out critical revision of the article.

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DeLappe, E., McGreevy, C., ni Chadhain, N. et al. Vitamin D insufficiency in older female community-dwelling acute hospital admissions and the response to supplementation. Eur J Clin Nutr 60, 1009–1015 (2006). https://doi.org/10.1038/sj.ejcn.1602412

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  • DOI: https://doi.org/10.1038/sj.ejcn.1602412

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