[Four years experience in the follow up of nursing children with urolithiasis]

to describe clinical data, metabolic profile, treatment and evolution of a nursing children cohort with urolithiasis.

using a descriptive, prospective and longitudinal design, were registered all patients with urolithiasis, of Pediatric Division at the Hospital General "Agustín O'Horán," in Yucatan, Mexico. We included all patients who were 36 months old and younger. We did not include children with malformations or associated disease which causes urolithiasis. Clinical and metabolic profiles, evaluation of the applied treatment as well as an evolution by four years period were done.

63 patients were recruited with ages ranging from 2 to 36 months; 39 (61.9 %) were male. The most common clinical signs were crying upon urination (49.2 %), urinary retention (31.7 %), hematuria (30.2 %), and pollakiuria (28.6 %). Calculus were most frequently located in the kidney (58.7 %). The most common complications were acute urinary tract infection (61.9 %), malnutrition (47.6 %) and acute renal failure (12.7 %). Documented metabolic alterations included hyperuricosuria (57.1 %), hypomagnesiuria (11.1 %) and hypercalciuria (9.5 %).

urolithiasis should be suspected in children with crying upon urination and urinary symptoms; it should be considered among the different causes of renal failure; hyperuricosuria was the most frequent metabolic alteration.