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Nephron. 1989;53(3):181-7.

Effects of chronic and acute protein administration on renal function in patients with chronic renal insufficiency.

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Department of Internal Medicine, Free University Hospital, Amsterdam, The Netherlands.


In 6 volunteers with normal renal function, we investigated the effects of various kinds of protein (soy, lactoprotein and beef) and various amounts of an intravenously administered amino acid solution on glomerular filtration (GFR) and effective renal plasma flow (ERPF). As for the protein-induced changes in renal function, rises in GFR and ERPF were lowest with soy protein, and highest with beef (baseline GFR, 110 +/- 5; soy, 122 +/- 5; beef, 131 +/- 5 ml/min/1.73 m2; mean +/- SEM). High doses of intravenous amino acids induced a rise in GFR comparable to that after beef (132 +/- 5 ml/min/1.73 m2). In a combined test a liquid mixed meal together with intravenously administered amino acids induced a comparable increase of the GFR (baseline 114 +/- 5 versus 129 +/- 5 ml/min/1.73 m2). When investigating 9 patients with chronic renal insufficiency after 4 weeks of low protein intake (LP) and after 4 weeks of high protein intake (HP), GFR and ERPF rose significantly under baseline conditions (GFR-LP41 +/- 9 versus GFR-HP 45 +/- 9 ml/min/1.73 m2, p less than 0.02; ERPF-LP 169 +/- 39 versus ERPF-HP 180 +/- 40 ml/min/1.73 m2, p less than 0.02; paired Wilcoxon). At the end of both dietary periods a comparable rise in renal function could be induced through acute stimulation (GFR-LP 20 +/- 5, GFR-HP 16 +/- 4; ERPF-LP 23 +/- 7, ERPF-HP 22 +/- 3%).(ABSTRACT TRUNCATED AT 250 WORDS).

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