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Multicenter Study
. 2014 Jun;34(4):447-55.
doi: 10.3747/pdi.2013.00001. Epub 2014 Feb 4.

Associations between serum-intact parathyroid hormone, serum 25-hydroxyvitamin D, oral vitamin D analogs and metabolic syndrome in peritoneal dialysis patients: a multi-center cross-sectional study

Jie Dong  1 , Qin Wang  1 , Meng-Hua Chen  1 , Hui-Ping Zhao  1 , Tong-Ying Zhu  1 , Na Tian  1 , Mei Wang  1 , Chuan-Ming Hao  1 , Ye-Ping Ren  1 , Hai-Yan Wang  1
Affiliations
Multicenter Study

Associations between serum-intact parathyroid hormone, serum 25-hydroxyvitamin D, oral vitamin D analogs and metabolic syndrome in peritoneal dialysis patients: a multi-center cross-sectional study

Jie Dong et al. Perit Dial Int. 2014 Jun.

Abstract

Introduction: Although previous studies have suggested associations between serum intact parathyroid hormone (iPTH), 25-hydroxyvitamin D (25(OH)D) and metabolic syndrome (MS) in the general population, these associations are still uncharacterized in peritoneal dialysis (PD) patients.

Methods: In total, 837 prevalent PD patients from 5 centers in China were enrolled between April 1, 2011 and November 1, 2011. The demographic data, biochemical parameters and medical records were collected, except for serum 25(OH)D which was measured in 347 of 837 patients. The definition of MS was modified from National Cholesterol Education Program Third Adult Treatment Panel (NCEP-ATPIII).

Results: 55.4% of 837 patients were found to have MS. The median concentration of iPTH, 25(OH)D and doses of oral vitamin D analogs for participants with MS was significantly lower than those without MS. The iPTH, 25(OH)D values and doses of vitamin D analogs were all associated with one or more components of MS. After multivariate adjustment, low serum iPTH values and oral vitamin D analogs, rather than serum 25(OH)D, were significantly associated with the presence of MS, abnormal fasting blood glucose (FBG) and high-density lipoprotein cholesterol (HDL-C). Compared to iPTH < 130 pg/mL, iPTH 130-585 pg/mL and > 585 pg/mL were associated with a lower risk of MS with adjusted odds ratio (OR) of 0.59 and 0.33, respectively. Taking vitamin D analogs was also associated with a lower risk of MS with adjusted OR of 0.55.

Conclusions: Serum iPTH and the use of active vitamin D supplements rather than serum 25(OH)D were independently associated with the presence of MS in patients on PD.

Keywords: Metabolic syndrome; parathyroid hormone; peritoneal dialysis; vitamin D.

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Figures

Figure 1 —
Figure 1 —
Adjusted ratio of varied levels of serum iPTH, 25(OH)D, oral vitamin D analogs for risk of MS. All models are adjusted for age, gender, body mass index, dialysis duration, serum calcium, phosphorus, albumin and C-reactive protein, hemoglobin, total Kt/V urea and residual renal function. iPTH = intact parathyroid hormone; 25(OH)D = 25-hydroxyvitaminD; CI = confidence interval.
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