Associations of Vitamin D Intake and Sleep Quality With Cognitive Dysfunction in Older Adults With Heart Failure

Background: Low vitamin D intake and poor sleep quality are independently associated with cognitive dysfunction in healthy older adults. However, the relationships among vitamin D intake, sleep quality, and cognitive dysfunction are unknown in older adults with heart failure (HF). Purpose: The aim of this study was to determine the relationships of vitamin D intake and sleep quality with cognitive dysfunction in older adults with HF. Methods: A total of 160 older adults with HF completed the Mini-Mental State Examination to assess cognitive function. Vitamin D deficiency was defined as less than 15 mcg/day of average intake determined using a 3-day food diary and use of dietary supplements. Sleep quality was measured by the Pittsburgh Sleep Quality Index (PSQI). Hierarchical regressions and mediation analysis were used for data analysis. Results: Thirty-four patients (21.2%) had severe cognitive dysfunction (total Mini-Mental State Examination score ≤ 19), 88 (55%) had vitamin D deficiency, and 120 (75%) reported poor sleep quality (total PSQI score> 5). Increased daily vitamin D intake (β = 0.305, P
Source: Journal of Cardiovascular Nursing - Category: Nursing Tags: ARTICLES: Heart failure Source Type: research