The authors summarize their observations of 18 children with orthostatic proteinuria. The average time of follow-up was 4 and half years. They examined body measures and renal functions of the patients and compared their blood pressure, pulse rate, electrocardiographic curve, morphological and positional conditions of kidneys in lying and standing position, as well as change of quantity and quality of proteinuria (high, middle and low molecular weight) at day time and night both in proteinuric children with and without ptosis renis and in controls. The patients were taller than the average, but their body mass was small compared to their weight. Ptosis renis was found in 11 patients. Renal functions remained good. The authors detected changes only in quantity and quality of proteinuria during of long term follow-up, the other parameters remained normal or the change was like that of the controls. They propose, that these two parameters are of prognostic importance.
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