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Effect on renal function of essential fatty acid supplementation in cystic fibrosis

Effect on renal function of essential fatty acid supplementation in cystic fibrosis

Journal of Pediatrics 115(2): 242-250

Changes in renal hemodynamics, sodium homeostasis, renal acidifying capacity, and aldosterone excretion were studied before and after long-term intravenous essential fatty acid supplementation for a period 3 years in 11 patients with cystic fibrosis. The mean (.+-. SD) glomerular filtration rate was high at the start of the study (133 .+-. 18 ml/min/1.73 m2 body surface area) and decreased significantly (p < 0.05) to within normal values after 1 year of essential fatty acid supplementation. The urinary elimination of an oral sodium load initially was very low (3.6 .+-. 2.5 mmol/hr/1.73 m2 body surface area vs control subjects' values of 7.9 .+-. 2.0; p < 0.001) and increased during treatment but was not normalized (p < 0.05 vs control subjects' values). Free water clearance and distal tubular sodium delivery, which were significantly decreased before treatment (p < 0.01 and p < 0.001 vs control subjects' values, respectively) did not increase significantly. The mean urinary aldosterone excretion did not significantly differ from that in control subjects before and after treatment. The acidifying capacity was disturbed, indicating a low renal bicarbonate threshold, and was changed during treatment in only 2 of 10 patients. These data indicate that essential fatty acid deficiency may contribute to the renal disturbances in cystic fibrosis.

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Accession: 007265300

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PMID: 2754552

DOI: 10.1016/s0022-3476(89)80072-1

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