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  • Title: Natriuretic action of arginine vasopressin in the conscious unrestrained rat.
    Author: Brimble MJ, Forsling ML, Musabayane CT.
    Journal: Acta Endocrinol (Copenh); 1988 Nov; 119(3):386-90. PubMed ID: 3188811.
    Abstract:
    A method for studying the renal action of AVP in the saline-infused conscious unrestrained rat is described. Conscious rats infused iv with 0.077 mol/l NaCl at 150 microliter/min had a plasma AVP concentration of 0.70 +/- 0.15 mol/l. AVP administration at 6 and 24 microU/min resulted in plasma AVP levels of 0.97 +/- 0.14 and 2.27 +/- 0.30 mU/l, respectively. AVP administration at 6 microU/min increased Na+ excretion from 11.9 +/- 0.80 to 14.0 +/- 0.9 mumol/min and at 24 microU/min AVP raised Na+ excretion from 10.3 +/- 0.7 to 14.0 +/- 1.1 mumol/min. The increases were accompanied by the expected reductions in urine flow. As the changes in plasma AVP are within the range occurring in response to moderate dehydration, the observed increases in Na+ excretion provide support for the view that AVP is involved in the physiological regulation of Na+ excretion.
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