4.4 Article

Association between winter season and risk of death from cardiovascular diseases: a study in more than half a million inpatients in Beijing, China

Journal

BMC CARDIOVASCULAR DISORDERS
Volume 13, Issue -, Pages -

Publisher

BIOMED CENTRAL LTD
DOI: 10.1186/1471-2261-13-93

Keywords

Cardiovascular disease; Winter; Seasonality; Older adults; Mortality; Asian population

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Background: Seasonal associations of cardiovascular mortality have been noted in most populations of European origin years ago, but are not well evaluated in Asian populations recently. Methods: Utilizing the electronic Hospitalization Summary Reports (HSRs) from 32 top-ranked hospitals in Beijing, China, we evaluated the association between winter season and the risk of cardiovascular death among hospitalized individuals. General additive models and logistic regression models were adjusted for confounding factors. Results: Older patients who were admitted to the hospital in the winter months (January, February, November and December) had a death risk that was increased by approximately 30% to 50% (P < 0.01) over those who were admitted in May. However, younger patients did not seem to experience the same seasonal variations in death risk. The excess winter deaths among older patients were associated with ischemic heart disease (RR = 1.22; 95% CI 1.13 to 1.31), pulmonary heart disease (RR = 1.42; 95% CI 1.10 to 1.83), cardiac arrhythmias (RR = 1.67; 95% CI 1.36 to 2.05), heart failure (RR = 1.30; 95% CI 1.09 to 1.54), ischemic stroke (RR = 1.30; 95% CI 1.17 to 1.43), and other cerebrovascular diseases (RR = 1.78; 95% CI 1.40 to 2.25). The risks of mortality were higher in winter months than in the month of May, regardless of the presence or absence of respiratory disease. Conclusions: Winter season was associated with a substantially increased risk of cardiovascular death among older Chinese cardiovascular inpatients.

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