RESUMO
PURPOSE: We compared the biochemical and clinical presentation of gouty diathesis in patients with uric acid and calcium nephrolithiasis MATERIALS AND METHODS: We retrospectively reviewed biochemical and clinical data from 69 gouty diathesis patients(48 with uric acid stones and 21 with calcium stones) and 57 normal subjects were performed at our institution. RESULTS: Demographic similarity between two groups was a male predominance. Gouty diathesis patients in both groups showed abnormally low urinary pH(<5.5) and propensity for hyperuricemia and hypertriglyceridemia. Gouty arthritis and hyperuricemia was found in 31% and 44% of those with uric acid stones whereas 9.5% and 23.8% in those with calcium stone respectively. In control group, 1 case presented with hyperuricemia and urinary pH at 6.3. Both urinary pH and citrate increased after potassium citrate treatment in both groups. CONCLUSIONS: The two groups of gouty diathesis with either uric acid stone or calcium stones have similar biochemical and clinical features that are characteristic of primary gout. Calcium stone formation in patients with hyperuricemia or persistent acidic urine may represent a latent form of gout. Patients with calcium stones and biochemical feature of gouty diathesis may manifest primary gouty. Both groups are responsive to potassium citrate treatment.