title: Urolithiasis in geriatric patients.
abstract: OBJECTIVE
  We intended to find risk factors for urolitiasis and its recurrence in a geriatric population.
  
  
  METHODS
  The medical records of 209 elderly stone patients over age 65 were reviewed. They had been regularly seen at our stone clinic for a mean follow-up period of 1385 +/- 1324 days after urolithiasis was diagnosed.
  
  
  RESULTS
  The elderly population comprised 9.6 % of all the stone patients followed at the stone clinic. Regarding stone compositions, calcium oxalate and calcium phosphate were most common in the elderly patients (80 %). The incidence of uric acid stones was higher in the elderly patient group than in the younger group (10.7 % vs. 5.1 %; p = 0.0046). Recurrent stones were seen in 18 of the 207 geriatric patients (15.4 %) during the follow-up period. The urinary calcium excretion of the recurrent stone patients was significantly higher than in those without recurrence (293 +/- 138 mg vs. 177 +/- 98 mg/day, p = 0.0035). However, the probability of stone recurrence estimated by Kaplan-Meier curves was as equivalent in the elderly patient group as in the younger group.
  
  
  CONCLUSIONS
  Hypercalciuria may also play a part in stone recurrence of geriatric patients.
authors.affiliation: Department of Urology, Tokai University School of Medicine, Isehara, Kanagawa, Japan.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Usui
authors.forename: Shouji
authors.initials: S
authors.lastname: Matsuzaki
authors.forename: Kazuo
authors.initials: K
authors.lastname: Matsushita
authors.forename: Masanori
authors.initials: M
authors.lastname: Shima
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D002118:Calcium / Q000652:urine; D002129:Calcium Oxalate / Q000032:analysis; D002130:Calcium Phosphates / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012189:Retrospective Studies; D012307:Risk Factors; D017678:Sex Distribution; D016019:Survival Analysis; D014527:Uric Acid / Q000032:analysis; D014545:Urinary Calculi / Q000737:chemistry* / Q000453:epidemiology / Q000209:etiology / Q000628:therapy / Q000652:urine
chemical_list: D002130:Calcium Phosphates; D002129:Calcium Oxalate; D014527:Uric Acid; C020243:calcium phosphate; D002118:Calcium