Our study demonstrates that even low doses of the polygelines Haemaccel and Gelofusine profoundly attenuate the tubular reabsorption of the low-molecular weight protein beta2-m. Atrial natriuretic peptide does not affect tubular protein reabsorption. Therefore, the rise in albuminuria during ANP infusion most likely reflects alterations in glomerular permeability.
In 1966, Gitelman described a benign variant of classical Bartter's syndrome in adults characterized by consistent hypomagnesemia and hypocalciuria, hypokalemic metabolic alkalosis and hyperreninemic hyperaldosteronism with normal blood pressure. A specific gene has been found responsible for this disorder, encoding the thiazide-sensitve Na-Cl coporter (TSC) in the distal convoluted tubule. Mutant alleles result in loss of normal TSC function and the phenotype is identical to patients with chronic use of thiazide diuretics. Gitelman's syndrome is a more common cause of chronic hypokalemia than Bartter's syndrome, with which it is often confused. The distinguishing features between both syndromes are discussed.
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