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Journal of Clinical Endocrinology & Metabolism, Vol 64, 624-627, Copyright © 1987 by Endocrine Society

ARTICLES

Atrial natriuretic peptide during mineralocorticoid escape in the human

RS Zimmerman, BS Edwards, TR Schwab, DM Heublein and JC Burnett Jr

The relationship between plasma atrial natriuretic peptide (ANP) and mineralocorticoid escape was examined in six normal men (age, 20-32 yr) treated with 0.4 mg/day fludrocortisone acetate for 9-14 days. Urinary sodium excretion decreased from 162 +/- 15 (SEM) meq/24 h before to 97 +/- 10 meq/24 h during fludrocortisone acetate administration (P less than 0.05). Despite continued fludrocortisone acetate administration, sodium excretion subsequently returned to baseline (escape). Plasma ANP increased from 33 +/- 6 pg/ml (control) to 55 +/- 14 pg/ml on the first day of escape (P less than 0.05). Escape was associated with a decrease in PRA from 0.90 +/- 0.22 (control) to 0.26 +/- 0.08 ng/ml X h (escape, P less than 0.05). The escape phenomenon was not associated with a significant change in mean arterial pressure or glomerular filtration rate. This study demonstrates that mineralocorticoid escape is temporally related to a significant increase in circulating ANP.


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