A cross-sectional analysis examined medication records in the National Alzheimer's Coordinating Center Database for community-dwelling patients with dementia who visited an Alzheimer's Disease Center between 2008 and 2014. Hispanic participants had a 1.62-fold greater use of antipsychotic medications, which was largely accounted for by a higher prevalence of neuropsychiatric symptoms and more severe dementia compared with non-Hispanic whites. These results are consistent with reports of later transition to nursing home care among Hispanic participants. Further studies are needed to clarify ethnic differences in how families and physicians address dementia progression and neuropsychiatric symptoms in community-dwelling patients with dementia.

Background

As vitamin D may have a neuroprotective effect, the authors studied the association of biomarkers of vitamin D status and delirium to see if low vitamin D status was common in delirium cases.

Methods

Biochemical measures of vitamin D (25-hydroxyvitamin D [25-OHD]) and calcium metabolism were used in this retrospective cross-sectional analysis of adult in-patients with delirium, admitted at three Canadian academic hospitals from January 2011 to July 2012. Primary outcome was to determine estimates of the prevalence of hypovitaminosis D in this group in whom vitamin D was checked.

Results

Seventy-one (5.8%) out of 1,232 delirium inpatients had their vitamin D measured. Thirty-nine (55%) showed vitamin D insufficiency (25-OHD of 25-75 nmol/L) and 8 (11%) showed vitamin D deficiency (25-OHD < 25 nmol/L). Mean serum 25-OHD levels were lower in males (57.1±7.7 nmol/L) than in females (78.2±6.1 nmol/L), p = .01, even when controlled for age and season. Men were younger than the women (74.4±2.3 vs. 82.4±1.7, p = .005). Mean age was 78.7±1.5 years, and 33 (47%) were male.

Conclusions

Although vitamin D is rarely checked during delirium workup and/or management, high rates of hypovitaminosis D were found to be common in the delirium in-patients in whom it was checked. Larger studies would be needed to estimate the prevalence of hypovitaminosis D in delirium and whether hypovitaminosis D plays a role in the pathogenesis of delirium.