Effect of long-term use of unfractionated or low-molecular-weight heparin on bone mineral density in maintenance hemodialysis patients.

INTRODUCTION

Long-term use of unfractionated heparin (UFH) or low-molecular-weight heparin (LMWH) causes bone loss and osteoporosis in patients not receiving hemodialysis. This study aimed to investigate the effect of UFH and LMWH on bone mineral density (BMD) in patients undergoing maintenance hemodialysis (MHD).

METHODS

Patients undergoing MHD using UFH or LMWH as anticoagulants were enrolled. BMD (in g/cm2 ), T-score and Z-score (BMDs) were measured at the lumbar spine and femur neck using dual-energy X-ray absorptiometry (DXA) at baseline and 2 years later. Patient demographics and clinical indices were collected. Correlation analysis was used to identify significant predictors of bone loss. Multiple linear regression was used to explore the relationship between heparin type and bone loss progression.

FINDINGS: A total of 104 patients were enrolled and completed the baseline BMD test; 72 completed the test again 2 years later. Six patients were excluded because they used both UFH and LMWH. Although BMD decreased in some patients in the UFH group, a slight increase in the BMD was observed on an average in the LMWH group after 2 years. The mean change in BMD (in g/cm2 ) [0(-0.03,0.04) vs. 0.04(0,0.06), P = 0.023], T-score [0(-0.40,0.30) vs. 0.35(-0.03,0.53), P = 0.038], and Z-score [0.10(-0.30,0.40) vs. 0.45(0.08,0.63), P = 0.031] in the lumbar spine in the UFH group was lower than those in the LMWH group. Femur neck BMD did not change significantly. In a linear regression model, after adjusting for diabetes mellitus, parathyroid hormone, and serum phosphate, we did not find an association between heparin substances and BMD.

DISCUSSION: UFH might be associated with loss of lumbar spine BMD in patients undergoing MHD.