title: Resolution of vitamin D insufficiency in osteopenic patients results in rapid recovery of bone mineral density.
abstract: Vitamin D insufficiency is characterized biochemically by the presence of secondary hyperparathyroidism, which can contribute to bone loss in osteopenic patients. Over a 2-yr period of evaluation of 118 consecutive, free living patients with osteopenia or osteoporosis, we identified 18 subjects with depressed serum 25-hydroxyvitamin D (250HD; < or = 14 ng/mL). Twelve of these subjects harbored a low 25OHD level and consented to undergo replacement with 50,000 IU vitamin D2 twice weekly for 5 weeks. Five hundred thousand units of oral vitamin D2 resulted in significant increases in 25OHD (+24.3+/-16.9 ng/mL; P < 0.001) and the fasting urinary calcium/creatinine excretion ratio (+0.06+/-0.004; P = 0.01) and significant decreases in the serum concentration of PTH (-32.9+/-36.9 pg/mL; P < 0.001) and osteocalcin (-4.9+/-2.4 ng/mL; P < 0.001). Vitamin D repletion was associated with a significant 4-5% annualized increase in bone mineral density at both the lumbar spine (P < 0.001) and the femoral neck (P = 0.03), indicating that resolution of vitamin D insufficiency in a population of patients with low bone mass results in a rapid rebound increase in bone mineral density.
authors.affiliation: Bone Center and Burns and Allen Research Institute, Cedars-Sinai Medical Center, University of California School of Medicine, Los Angeles 90048, USA. adamsj@cshs.org
authors.forename: J S
authors.initials: JS
authors.lastname: Adams
authors.forename: V
authors.initials: V
authors.lastname: Kantorovich
authors.forename: C
authors.initials: C
authors.lastname: Wu
authors.forename: M
authors.initials: M
authors.lastname: Javanbakht
authors.forename: B W
authors.initials: BW
authors.lastname: Hollis
mesh_terms: D000328:Adult; D000368:Aged; D015519:Bone Density; D001851:Bone Diseases, Metabolic / Q000188:drug therapy*; D002112:Calcifediol / Q000097:blood; D004872:Ergocalciferols / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010281:Parathyroid Hormone / Q000097:blood; D014808:Vitamin D Deficiency / Q000188:drug therapy*
chemical_list: D004872:Ergocalciferols; D010281:Parathyroid Hormone; D002112:Calcifediol