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Bone Metabolism Status and Associated Risk Factors in Elderly Patients with Chronic Obstructive Pulmonary Disease (COPD)

Cell Biochemistry and Biophysics volume 70, pages 129–134 (2014)Cite this article

Abstract

The prevalence of osteoporosis in older patients with chronic obstructive pulmonary disease (COPD) is higher than in the age-matched elderly patients, but the exact cause in relation to COPD is not clear. We hypothesized that the underlying causes for this difference are related to bone metabolism with the possible risk factors that include the duration of COPD, GOLD grade, cor pulmonale, the frequencies of acute exacerbations within the past year, smoking and inhaled corticosteroid therapy. We conducted a matched-pair study of 100 patients aged older than 65 years at the Southwest Hospital from May to November 2012. The enrolled patients with COPD were matched to controls for age and gender. Clinical characteristics of cohorts were recorded. Bone mineral density (BMD) was measured using dual-energy X-ray absorptiometry and osteoporosis was diagnosed according to the definition of WHO. All cohorts accepted bone metabolism marker measurement, including Procollagen type 1 aminoterminal propeptide (P1NP), β-C-telopeptides of type I collagen (βCTX), and N-terminal midmolecule fragment osteocalcin (N-MID OC). Statistical analysis was calculated using the student’s t test, ANOVA and multiple regression analysis at a significance level set at a p < 0.05. Circulating biochemical markers of bone formation (P1NP), resorption (βCTX) and turnover (N-MID OC) were significantly lower in the COPD group than control group, while mean 25-OH Vitamin D was similar in two groups. The P1NP, βCTX, and N-MID OC were still lower in men with COPD, but only P1NP was lower in women with COPD compared to that of controls. Multiple regression analysis in COPD group suggests that age, the frequency of acute exacerbation, and BMD are independent risk factors for P1NP. The frequency of acute exacerbation within the past one year and 25-OH D level are independent risk factors for βCTX; the frequency of acute exacerbation is the only independent risk factor for N-MID OC. These were significant differences in bone metabolism in patients with or without COPD. These results should help us to further understand the cause of osteoporosis and fractures and conduce to prevent osteoporosis in patients with COPD.

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Acknowledgments

This work was supported by a grant from the Chongqing Science and Technology Foundation (No. cstc2012gg-yyjs0730).

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The authors declare that they have no conflict of interest.

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Affiliations

  1. Department of Geriatrics, Southwest Hospital, Third Military Medical University, Gao Tan Yan Street, Sha Ping Ba District, Chongqing, 400038, People’s Republic of China

    Wang Xiaomei, Xiao Hang, Liu Lingling & Li Xuejun

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  1. Wang Xiaomei
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  2. Xiao Hang
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  3. Liu Lingling
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  4. Li Xuejun
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Correspondence to Li Xuejun.

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Xiaomei, W., Hang, X., Lingling, L. et al. Bone Metabolism Status and Associated Risk Factors in Elderly Patients with Chronic Obstructive Pulmonary Disease (COPD). Cell Biochem Biophys 70, 129–134 (2014). https://doi.org/10.1007/s12013-014-9868-9

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  • DOI: https://doi.org/10.1007/s12013-014-9868-9

Keywords

  • Chronic obstructive pulmonary disease (COPD)
  • Osteoporosis
  • BMD
  • Bone metabolism
  • The frequency of acute exacerbation