Increased risk of ischaemic stroke amongst patients with chronic osteomyelitis: a population-based cohort study in Taiwan

Authors

  • C.-H. Tseng,

    1. Department of Neurology, China Medical University Hospital, Taichung, Taiwan
    2. Graduate Institute of Clinical Medical Science, College of Medicine, China Medical University, Taichung, Taiwan
    Search for more papers by this author
  • J.-H. Chen,

    1. Graduate Institute of Clinical Medical Science, College of Medicine, China Medical University, Taichung, Taiwan
    2. Department of Internal Medicine, China Medical University Hospital, Taichung, Taiwan
    Search for more papers by this author
  • C.-H. Muo,

    1. Management Office for Health Data, China Medical University Hospital, Taichung, Taiwan
    2. Institute of Environmental Health, College of Public Health, China Medical University, Taichung, Taiwan
    Search for more papers by this author
  • Y.-J. Chang,

    1. Management Office for Health Data, China Medical University Hospital, Taichung, Taiwan
    2. Institute of Environmental Health, College of Public Health, China Medical University, Taichung, Taiwan
    Search for more papers by this author
  • F.-C. Sung,

    1. Management Office for Health Data, China Medical University Hospital, Taichung, Taiwan
    2. Institute of Environmental Health, College of Public Health, China Medical University, Taichung, Taiwan
    Search for more papers by this author
  • C. Y. Hsu

    Corresponding author
    1. Department of Neurology, China Medical University Hospital, Taichung, Taiwan
    2. Graduate Institute of Clinical Medical Science, College of Medicine, China Medical University, Taichung, Taiwan
    • Correspondence: C. Y. Hsu, Graduate Institute of Clinical Medical Science, China Medical University, 2 Yuh-Der Road, Taichung 40447, Taiwan (tel.: +886 4 2205 2121 ext. 5040; fax: +886 4 2234 4055; e-mail: hsuc@mail.cmuh.org.tw).

    Search for more papers by this author

Abstract

Background and purpose

Inflammatory processes, which kindle endothelial dysfunction and atherosclerosis, may facilitate the development of cardiovascular disease, including ischaemic stroke. Evident stroke risk factors may not be identified in up to 40% of stroke patients, especially in the younger population. Inflammation remains to be established as a stroke risk factor. In this study, it was assessed whether chronic osteomyelitis (COM), an infectious disease with chronic inflammation, increases stroke risk.

Methods

A national insurance claim data set of 22 million enrollees in Taiwan was used to identify 18 509 patients with COM and 74 034 randomly selected age- and gender-matched controls for a follow-up period of 11 years starting 1 January 2000 and ending 31 December 2010. Stroke risk was analyzed using the Cox proportional hazards regression model.

Results

Comorbidities known to increase stroke risk, including hypertension, diabetes, hyperlipidemia, coronary heart disease and peripheral arterial disease, were more frequently noted in the COM group who had significantly greater stroke risk than the control cohort. Comparing only those without comorbidities, COM carried greater stroke risk than the control group [hazard ratio (HR) = 1.40, 95% confidence interval (CI) 1.22–1.62, P < 0.001]. The younger population carried even greater risk (age < 45, HR = 2.73, 95% CI 1.71–4.35; age > 65, HR = 1.16, 95% CI 1.02–1.31).

Conclusions

This is the first report linking COM to an increased risk of developing stroke. Results suggest that COM is a significant stroke risk factor and call for closer attention to this group of patients for more rigorous stroke prevention, especially in the younger age group.

Ancillary