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Journal Article
Research Support, Non-U.S. Gov't
Hormone and hemodynamic responses to atrial natriuretic peptide in conscious sheep and effect of hemorrhage.
Endocrinology 1988 Februrary
The effect of rat atrial natriuretic peptide (ANP) on basal hemodynamic and hormonal function and on the response to acute hemorrhage was studied in eight conscious sheep. ANP infusions (3 micrograms/kg BW bolus, followed by 50 ng/kg.min for 70 min) increased plasma immunoreactive ANP levels from less than 12 pmol/liter to steady state levels of 523 +/- 20 pmol/liter, reduced arterial pressure by 14% (P less than 0.002), increased heart rate by 26% (P less than 0.06), and increased plasma norepinephrine levels (P less than 0.015) compared to control values. These changes were associated with a significant increase in plasma cortisol (P less than 0.05) and smaller increases in plasma ACTH and arginine vasopressin (AVP), but plasma angiotensin II (AII) and aldosterone were unaffected. When hemorrhage (15 ml/kg BW over 10 min) was performed during ANP or control infusions, hypotension was greater (P less than 0.0004) during ANP treatment and the responses of plasma ACTH, AVP, catecholamines, and AII were enhanced compared with those to control hemorrhage. Plasma immunoreactive ANP during ANP infusions was significantly higher after hemorrhage (mean, 833 +/- 46; P less than 0.003), but the disappearance rate after the termination of ANP infusion was the same (3.1 min) with or without hemorrhage. These studies show that ANP infusions, achieving plasma levels observed in pathological states such as congestive heart failure, inhibit the expected responses of plasma AII and aldosterone to mild acute hypotension, but do not inhibit the responses of plasma AVP, ACTH, AII, and aldosterone associated with acute moderate hemorrhage in conscious sheep.
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