title: Parathyroidectomy Halts the Deterioration of Renal Function in Primary Hyperparathyroidism.
abstract: OBJECTIVE
  Decreased renal function has been consistently included among factors prompting recommendation for surgery in primary hyperparathyroidism (PHPT). However, most retrospective studies addressing this issue did not show an improvement in renal function after parathyroidectomy (PTX). The aim of this study was to investigate changes in renal function after PTX in PHPT patients subdivided according to renal function at diagnosis.
  
  
  METHODS
  This was a retrospective cross-sectional study.
  
  
  METHODS
  We studied 109 consecutive PHPT patients before and after PTX. Biochemical evaluation included fasting total and ionized serum calcium, phosphate, creatinine, immunoreactive intact PTH, and 25-hydroxyvitamin D3 levels. Glomerular filtration rate (GFR) was assessed with the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation.
  
  
  RESULTS
  Mean (± SD) CKD-EPI estimated GFR (eGFR) at diagnosis was 82.4 ± 19.3 mL/min/1.73 m(2) (median, 84.8 mL/min/1.73 m(2); interquartile range, 68.5-94.2 mL/min/1.73 m(2)). Patients with eGFR equal to or higher than 60 mL/min/1.73 m(2) (group 1, n = 95) were significantly younger than patients with eGFR lower than 60 mL/min/1.73 m(2) (group 2, n = 14; P < .0003). After PTX, eGFR did not change in patients of group 2 (P = .509), whereas it was significantly reduced in patients of group 1 (P < .0002). The difference in eGFR between baseline and post-PTX values was correlated negatively with baseline serum creatinine (R = -0.27; P = .0052) and positively with baseline CKD-EPI eGFR (R = 0.32; P = .00062). At multiple regression analysis, only systolic blood pressure and baseline CKD-EPI eGFR were independent predictors of GFR variation.
  
  
  CONCLUSIONS
  Surgical cure of PHPT halts renal function deterioration in patients with coexisting renal disease. Our study thus supports the indication for surgery in patients with eGFR less than 60 mL/min/1.73 m(2), as recommended by current guidelines. Moreover, our data show that presurgical renal function is a relevant predictor of renal function after PTX.
authors.affiliation: Divisions of Endocrinology and Metabolism (F.T., E.C., C.B., G.B.) and Nephrology (A.G.), Santa Croce and Carle Hospital, 12100 Cuneo, Italy; and Endocrinology Service (R.A.), Galeazzi Institute Instituto di Ricovero e Cura a Carattere Scientifico, 20161 Milan, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Tassone
authors.affiliation: Divisions of Endocrinology and Metabolism (F.T., E.C., C.B., G.B.) and Nephrology (A.G.), Santa Croce and Carle Hospital, 12100 Cuneo, Italy; and Endocrinology Service (R.A.), Galeazzi Institute Instituto di Ricovero e Cura a Carattere Scientifico, 20161 Milan, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Guarnieri
authors.affiliation: Divisions of Endocrinology and Metabolism (F.T., E.C., C.B., G.B.) and Nephrology (A.G.), Santa Croce and Carle Hospital, 12100 Cuneo, Italy; and Endocrinology Service (R.A.), Galeazzi Institute Instituto di Ricovero e Cura a Carattere Scientifico, 20161 Milan, Italy.
authors.forename: Elena
authors.initials: E
authors.lastname: Castellano
authors.affiliation: Divisions of Endocrinology and Metabolism (F.T., E.C., C.B., G.B.) and Nephrology (A.G.), Santa Croce and Carle Hospital, 12100 Cuneo, Italy; and Endocrinology Service (R.A.), Galeazzi Institute Instituto di Ricovero e Cura a Carattere Scientifico, 20161 Milan, Italy.
authors.forename: Claudia
authors.initials: C
authors.lastname: Baffoni
authors.affiliation: Divisions of Endocrinology and Metabolism (F.T., E.C., C.B., G.B.) and Nephrology (A.G.), Santa Croce and Carle Hospital, 12100 Cuneo, Italy; and Endocrinology Service (R.A.), Galeazzi Institute Instituto di Ricovero e Cura a Carattere Scientifico, 20161 Milan, Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: Attanasio
authors.affiliation: Divisions of Endocrinology and Metabolism (F.T., E.C., C.B., G.B.) and Nephrology (A.G.), Santa Croce and Carle Hospital, 12100 Cuneo, Italy; and Endocrinology Service (R.A.), Galeazzi Institute Instituto di Ricovero e Cura a Carattere Scientifico, 20161 Milan, Italy.
authors.forename: Giorgio
authors.initials: G
authors.lastname: Borretta
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001794:Blood Pressure; D002118:Calcium / Q000097:blood; D003430:Cross-Sectional Studies; D005260:Female; D005919:Glomerular Filtration Rate / Q000502:physiology; D006801:Humans; D049950:Hyperparathyroidism, Primary / Q000097:blood / Q000150:complications* / Q000503:physiopathology / Q000601:surgery*; D007668:Kidney / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D016105:Parathyroidectomy / Q000706:statistics & numerical data; D051436:Renal Insufficiency, Chronic / Q000097:blood / Q000209:etiology / Q000503:physiopathology / Q000517:prevention & control*; D012189:Retrospective Studies
chemical_list: D002118:Calcium