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Abstract Title:

Serum 25-hydroxyvitamin D as a predictor of mortality and cardiovascular events: a 20 year study of a community-based cohort.

Abstract Source:

Clin Endocrinol (Oxf). 2017 Sep 26. Epub 2017 Sep 26. PMID: 28949411

Abstract Author(s):

Kun Zhu, Matthew Knuiman, Mark Divitini, Joseph Hung, Ee Mun Lim, Brian R Cooke, John P Walsh

Article Affiliation:

Kun Zhu

Abstract:

OBJECTIVE: Prospective studies, mostly from Europe and North America, suggest that serum 25-hydroxyvitamin D (25(OH)D) is inversely associated with mortality and cardiovascular disease (CVD) risk. Data from other regions are limited, and threshold levels for adverse cardiovascular outcomes uncertain. We examined serum 25(OH)D as a predictor of total mortality and cardiovascular outcomes in an Australian cohort.

DESIGN: A 20-year, community-based cohort study.

PATIENTS: Participants in the 1994/1995 Busselton Health Survey (n=3946, baseline age 25-84 years).

MEASUREMENTS: Baseline serum 25(OH)D and mortality and cardiovascular outcomes to 2014 obtained by record linkage.

RESULTS: The mean serum 25(OH)D concentration was 60.6±18.0 nmol/L. During 20 years follow-up (excluding the first 2 years), 889 participants died (including 363 from CVD) and 944 experienced a CVD event (including 242 with heart failure). In the full cohort, controlling for Framingham risk score variables, higher baseline 25(OH)D was associated withsignificantly reduced all-cause mortality (adjusted HR 0.83 per SD increment of 25(OH)D, 95% CI 0.77-0.90), CVD death (HR 0.85, 95% CI 0.74-0.96) and heart failure (HR 0.81, 95% CI 0.69-0.94), but not CVD events (HR 0.99, 0.92-1.07). In restricted cubic spline regression models, serum 25(OH)D below65 and 55 nmol/L was associated with higher total mortality and higher CVD mortality/heart failure, respectively. In participants without CVD at baseline (n=3220) results were similar, but hazard ratios were attenuated and associations with CVD mortality no longer significant.

CONCLUSIONS: In an Australian community-based cohort, baseline vitamin D levels below 55-65 nmol/L are predictive of all-cause mortality, CVD death and heart failure. This article is protected by copyright. All rights reserved.

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