Contribution to the etiopathogenesis of orthostatic proteinuria in children.

The results of sequential scintigraphy of the kidneys of 22 children with orthostatic proteinuria and of 25 patients with nephritis or nephrotic syndrome, respectively, have been evaluated. At particular time intervals significant differences have been found between the two groups. On the basis of the visual method of evaluation of scintiscans and by bilateral comparison the authors conclude that in children with orthostatic proteinuria the frequency of asymmetry of the kidneys was significantly higher. These changes were most likely due to spasms or other disturbances of the function of excretory urinary passages in the calyx-pelvis system as responses to unfavourable emotional inpulses (intravenous application of the substance, etc.) and to the sitting position during the examination.