title: [Severity of acquired cystic kidney disease determines improvement in chronic kidney failure anemia].
abstract: OBJECTIVE
  To identify a correlation between dialysis treatment duration and severity of acquired cystic disease of the end-stage kidney measured by cyst sizes; and assess its effect on spontaneous improvement of anemia.
  
  
  METHODS
  Ten patients, 6 males and 4 females were selected, who have been on hemodialytic treatment for more than 5 years. There was no patient selected with autosomal dominant polycystic kidney disease. The renal evaluation has been made through ultrasonographic studies. Acquired cystic disease of the end-stage kidney was characterized by finding four or more cysts in both kidneys. The largest cysts were measured for correlation effect. The diagnosis of anemia was established by hematocrit and hemoglobin serum values. It has also been analyzed serum urea, creatinine, albumin, iron, total iron-binding capacity and the per cent saturation of serum transferrin were tested.
  
  
  RESULTS
  The patients were properly dialysed (serum urea and creatinine = 98.7 +/- 35 mg/dL e 9.7 +/- 2.7 mg/dL, respectively). There were in good nutritional shape (serum albumin = 4.5 +/- 0.5 g/dL) and had normal serum iron level (serum iron = 80 +/- 34 mg/dL). The prevalence of acquired renal cystic disease was 80%. No finding of malignancy has been detected in these cysts. There was a significant correlation between time on dialysis treatment and hematocrit values (R = 0.70; p < 0.05). Cyst sizes had a direct and significant correlation with hematocrit levels (R = 0.74; p < 0.05).
  
  
  CONCLUSIONS
  These results show that spontaneous improvement on anemia seen in patients on chronic dialysis has a significant correlation with the severity of acquired cystic disease of the end-stage kidney. Our data suggest a functional role of acquired kidney cysts on endogenous erythropoietin production.
authors.affiliation: Universidade Federal do Rio Grande do Norte e Instituto de Radiologia de Natal.
authors.forename: H M
authors.initials: HM
authors.lastname: Bezerra
authors.forename: G P
authors.initials: GP
authors.lastname: Maia
authors.forename: F A
authors.initials: FA
authors.lastname: Bezerra Neto
authors.forename: M
authors.initials: M
authors.lastname: Serra
authors.forename: J B
authors.initials: JB
authors.lastname: de Almeida
mesh_terms: D000328:Adult; D000740:Anemia / Q000150:complications*; D004921:Erythropoietin / Q000502:physiology; D005260:Female; D006400:Hematocrit; D006801:Humans; D052177:Kidney Diseases, Cystic / Q000150:complications* / Q000000981:diagnostic imaging; D007676:Kidney Failure, Chronic / Q000150:complications* / Q000628:therapy; D016014:Linear Models; D008297:Male; D011446:Prospective Studies; D006435:Renal Dialysis; D012720:Severity of Illness Index; D013997:Time Factors; D014463:Ultrasonography
chemical_list: D004921:Erythropoietin