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  • Title: Circadian rhythm of plasma aldosterone and plasma renin activity in steroid and non-steroid treated kidney transplanted patients.
    Author: Olgaard K, Madsen S, Roosen J, Hammer M.
    Journal: Scand J Clin Lab Invest; 1977 Sep; 37(5):431-7. PubMed ID: 337462.
    Abstract:
    The circadian rhythm of plasma aldosterone (PAC) and cortisol concentration (PCC), and renin activity (PRA) was measured in five steroid and five non-steroid treated kidney transplanted patients--all with denervated kidney grafts--and compared with four normal controls and two steroid-treated patients with non-renal disease and thus normal renal innervation. The non-steroid treated patients had a normal circadian thythm of PAC and PCC, but without variation of PRA, suggesting that denervation of the kidneys has no influence on the circadian rhythm of PAC. In both steroid treated groups the PAC showed an inverse diurnal variation--now correlating to the diurnal variation in PRA. The inverse circadian rhythm of PAC in patients with suppressed ACTH secretion remains unexplained, but is in accordance with the nocturnal peak of sodium and water excretion in steroid treated patients.
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