title: Bone mineral density in geriatric patients with toxic nodular goiter.
abstract: OBJECTIVE
  We aimed to assess bone mineral density (BMD) in geriatric patients with hyperthyroidism caused by TNG.
  
  
  METHODS
  Bone mineral density was measured at the lumbar spine and proximal femur, using dual-X-ray absorptiometry (DXA) in 90 patients with TNG (mean age; 69.2 ± 4.4 years) and compared with those in 42 age-matched healthy subjects (mean age; 68.40 ± 4.3 years). Serum levels of TSH, fT3, fT4, 25-OH vitamin D and PTH were measured.
  
  
  RESULTS
  BMD was significantly lower at total spine (0.904 ± 0.1 vs. 1.114 ± 0.1 g/cm(2)) and total hip (0.850 ± 0.1 vs. 1.079 ± 0.1 g/cm(2)) in male patients with TNG in comparison to the healthy men (p = 0.001, p < 0.001). Postmenopausal women with TNG had lower BMD measurements at total lumbar spine (0.754 ± 0.1 vs. 0.870 ± 0.2 g/cm(2), p < 0.001) and total hip (0.765 ± 0.1 vs. 0.831 ± 0.2 g/cm(2), p < 0.001) in comparison to the healthy women. T scores of total lumbar spine and hip were lower in patients with subclinical hyperthyroidism compared to the control group, respectively (-1.9 ± 1.7 vs -0.8 ± 1.8, p = 0.007; -1.09 ± 1.2 vs. -0.02 ± 1.6, p = 0.001). While serum levels of fT3 and fT4 revealed a negative correlation with T score of BMD measurements at the total spine and hip, TSH levels were positively correlated. We did not find a difference in serum calcium, phosphorus, 25-OH vitamin D and PTH levels between the two groups (p > 0.005).
  
  
  CONCLUSIONS
  Geriatric patients with hyperthyroidism secondary to TNG had reduced BMD at the total spine and hip. Thus, we suggest to investigate bone mineral density in geriatric patients with TNG.
authors.affiliation: Department of Endocrinology and Metabolism Disease, Recep Tayyip Erdogan University Medical School, 53020, Rize, Turkey, serapbaydur@gmail.com.
authors.forename: Serap Baydur
authors.initials: SB
authors.lastname: Sahin
authors.forename: Teslime
authors.initials: T
authors.lastname: Ayaz
authors.forename: Fatih
authors.initials: F
authors.lastname: Sumer
authors.forename: Kadir
authors.initials: K
authors.lastname: İlkkilic
authors.forename: Ekrem
authors.initials: E
authors.lastname: Algun
mesh_terms: D015502:Absorptiometry, Photon; D000368:Aged; D015519:Bone Density; D005260:Female; D005269:Femur; D006044:Goiter, Nodular / Q000378:metabolism*; D006801:Humans; D008159:Lumbar Vertebrae; D008297:Male; D008875:Middle Aged; D014807:Vitamin D / Q000031:analogs & derivatives
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D