[Renal function in diabetic children and adolescents. Relation to the duration and level of control of the disease]. / Función renal en niños y adolescentes diabéticos. Relación con la duración y nivel de control de la enfermedad.

We have evaluated different aspects of the kidney function of 68 diabetic children and adolescents with the aim of estimating the prevalence of nephropathy and its influential factors. In addition, the kidney function is followed for an additional 18 months. The results are compared with those obtained from a group of healthy children of the same ages. No clinical nephropathy existed, with only 4 (5.97%) and 8 cases of incipient nephropathy and microalbuminuria, respectively, being demonstrated. The urinary albumin excretion rate (AER) is very clearly connected with the duration and the metabolic control of diabetes. Elevated values for AER were also observed in poorly controlled diabetics and those with prolonged evolution. Nevertheless, the last point may be secondary to the development of puberty, since with the same duration of diabetes (under 5 years), the proportion of pubertal patients with microalbuminuria is higher than that for prepubertal children.