title: Serum levels of uric acid and diabetes mellitus influence survival after surgery for primary hyperparathyroidism: a prospective cohort study.
abstract: BACKGROUND
  Primary hyperparathyroidism (pHPT) is associated with an increased mortality attributable to cardiovascular disease (CVD), suggested to be alleviated by surgery. The exact mechanism of the beneficial influence of parathyroidectomy on survival is unknown. Furthermore, studies suggest that there is no increased mortality compared to the mortality rate in the general population during recent years. This study therefore investigated relative survival (RS), as well overall mortality associated with the clinical and biochemical variables in patients undergoing operation for sporadic pHPT. Furthermore, the influence of surgery on biochemical variables associated with pHPT was analyzed.
  
  
  METHODS
  A group of 323 patients with sporadic pHPT operated between September 1989 and July 2003 were followed from surgery over a 10-year period. The median and mean follow-up time was 69 and 70 months, respectively (range: 1-120 months). Relative survival (RS) was calculated, and the impact of clinical and biochemical variables on overall death were evaluated.
  
  
  RESULTS
  Postoperatively, serum levels of triglycerides and uric acid decreased. Glucose levels and glomerular filtration rate remained unchanged. A decreased RS was evident during the latter part of the 10 year follow-up period. In the multivariate Cox-analysis, diabetes mellitus (hazard ratio [HR] = 2.8, 95%; confidence interval [CI] 1.2-6.7), and the combination of an increased level of serum uric acid and cardiovascular disease (CVD) (HR = 8.6, 95%; CI 1.5-49.7) was associated with a higher mortality. The increased risk of death was evident for patients with persistently increased levels of uric acid postoperatively (HR = 4.8, 95%; CI = 1.4-16.01).
  
  
  CONCLUSIONS
  Patients undergoing operation for pHPT had a decreased RS during a 10-year follow-up compared to the general population. This decrease in RS is associated with diabetes mellitus and increased levels of uric acid pre-and postoperatively.
authors.affiliation: Department of Surgery, Lund University Hospital, 221 85 Lund, Sweden. anders.bergenfelz@kir.lu.se
authors.forename: Anders
authors.initials: A
authors.lastname: Bergenfelz
authors.forename: Anna
authors.initials: A
authors.lastname: Bladström
authors.forename: Mark
authors.initials: M
authors.lastname: Their
authors.forename: Erik
authors.initials: E
authors.lastname: Nordenström
authors.forename: Stig
authors.initials: S
authors.lastname: Valdemarsson
authors.forename: Johan
authors.initials: J
authors.lastname: Westerdahl
mesh_terms: D000236:Adenoma / Q000150:complications; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002118:Calcium / Q000097:blood; D003404:Creatinine / Q000097:blood; D003920:Diabetes Mellitus / Q000453:epidemiology*; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D049950:Hyperparathyroidism, Primary / Q000097:blood / Q000453:epidemiology / Q000209:etiology / Q000401:mortality* / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D010282:Parathyroid Neoplasms / Q000150:complications; D016016:Proportional Hazards Models; D011446:Prospective Studies; D016019:Survival Analysis; D014280:Triglycerides / Q000097:blood; D014527:Uric Acid / Q000097:blood*
chemical_list: D014280:Triglycerides; D014527:Uric Acid; D003404:Creatinine; D002118:Calcium