title: Factors associated with secondary hyperparathyroidism in premenopausal women undergoing Roux-en-Y gastric bypass for the treatment of obesity.
abstract: OBJECTIVE
  To evaluate bone metabolism, bone density (BMD) and vertebral fractures in morbidly obese individuals.
  
  
  METHODS
  Case series of 29 premenopausal obese patients, 15 of whom had been submitted to bariatric surgery. Serum calcium, albumin, PTH and 25-hydroxy vitamin D (25OHD) were measured as well as bone densitometry of the lumbar spine and proximal femur, and lateral spine x-rays.
  
  
  RESULTS
  High parathyroid hormone (PTH) levels were recorded in 46.6% of the surgical patients and in 21.4% of the non-surgical patients (p = 0.245); 26.7% of the former and 28.6% of the latter revealed levels 25OHD < 30 ng/mL (p = 1.000). Calcium intake was higher in the surgical group (p = 0.004) along with lower serum calcium concentrations (p = 0.019). There were no significant differences in bone mineral density (BMD) or in the prevalence of vertebral fractures between groups.
  
  
  CONCLUSIONS
  In premenopausal women undergoing Roux-en-Y gastric bypass there is important intestinal calcium mal absorption which seems to be the main factor causing secondary hyperparathyroidism.
authors.affiliation: Hospital Agamenon Magalhães, Universidade do Estado de Pernambuco, Recife, PE, Brasil.
authors.forename: Renata Simões de
authors.initials: RS
authors.lastname: Vasconcelos
authors.forename: Maíra
authors.initials: M
authors.lastname: Viégas
authors.forename: Thyciara Fontenele
authors.initials: TF
authors.lastname: Marques
authors.forename: Erik Trovão
authors.initials: ET
authors.lastname: Diniz
authors.forename: Cynthia Salgado
authors.initials: CS
authors.lastname: Lucena
authors.forename: José Bezerra
authors.initials: JB
authors.lastname: Câmara Neto
authors.forename: Francisco
authors.initials: F
authors.lastname: Bandeira
mesh_terms: D000293:Adolescent; D000328:Adult; D015415:Biomarkers / Q000097:blood; D015519:Bone Density / Q000502:physiology*; D001851:Bone Diseases, Metabolic / Q000209:etiology; D016723:Bone Remodeling / Q000502:physiology; D001842:Bone and Bones / Q000378:metabolism*; D002118:Calcium / Q000097:blood; D002136:Calcium, Dietary / Q000008:administration & dosage; D005260:Female; D015390:Gastric Bypass; D006801:Humans; D006962:Hyperparathyroidism, Secondary / Q000209:etiology*; D009765:Obesity / Q000601:surgery*; D010281:Parathyroid Hormone / Q000097:blood; D017697:Premenopause / Q000097:blood; D016103:Spinal Fractures; D055815:Young Adult
chemical_list: D015415:Biomarkers; D002136:Calcium, Dietary; D010281:Parathyroid Hormone; D002118:Calcium