Hypercalciuria and hematuria in juvenile rheumatoid arthritis.
OBJECTIVE
To investigate the frequency of hypercalciuria and the relationship between hypercalciuria and hematuria in patients with juvenile rheumatoid arthritis (JRA).


METHODS
Twenty-eight children with JRA were studied, as well as 10 patients with acute arthritis unrelated to JRA and 14 healthy children as control groups. Cases with urinary calcium excretion (UCE) >4 mg/kg/day were considered hypercalciuric. Urinalysis was performed for detecting hematuria in all cases.


RESULTS
UCE was 4.19 +/- 2.9 mg/kg/day in patients with JRA, 1.94 +/- 1.57 mg/kg/day in children with acute arthritis, and 2.0 +/- 1.45 mg/kg/day in healthy children. UCE was significantly higher in JRA compared with the other study groups. Of the 28 patients with JRA, 13 (46.4%) had hypercalciuria and 6 (21.4%) had hematuria. UCE was significantly higher in hematuric patients with JRA than in those with no hematuria (p<0.05). UCE in patients with JRA without hematuria was also higher than the UCE values detected in the disease and healthy control groups (p<0.05).


CONCLUSIONS
Hypercalciuria is a frequent finding in patients with JRA [13/28 (46.4%)] and should be considered during the investigation of hematuria in patients with JRA.
Kasapçopur
O
O
Department of Pediatrics, Cerrahpaşa Medical Faculty, University of Istanbul, Turkey.
Sever
L
L
Taşdan
Y
Y
Calişkan
S
S
Arisoy
N
N
D000293:Adolescent; D001171:Arthritis, Juvenile / Q000097:blood / Q000150:complications* / Q000652:urine; D002118:Calcium / Q000097:blood / Q000652:urine*; D002128:Calcium Metabolism Disorders / Q000097:blood / Q000150:complications* / Q000652:urine; D002648:Child; D002675:Child, Preschool; D005260:Female; D006417:Hematuria / Q000150:complications*; D006801:Humans; D007223:Infant; D008297:Male
D002118:Calcium