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PubMed1995

Plasma renin activity, aldosterone and cortisol secretions after acute hemorrhage and supine to vertical postural change in dogs.

Acute hemorrhage and horizontal to vertical postural change are accompanied by decrease in blood volume of cardiovascular central reflexogenic areas (CRA) and by central hypoxia, followed by pressor responses. In these both circumstances important reflexogenic and humoral pressor reactions occured, as cathecolamine, renin and aldosterone hypersecretions. Aldosterone hypersecretion is considered as produced by angiotensin II, by a complex renin-angiotensin(RA)-aldosterone system. The main purpose of this work was to clarify the presence of this RA-aldosterone system after acute hemorrhage and in head-up postural change. In this aim we studied on dogs renin, aldosterone and cortisol responses. We analysed in these two circumstances the correlation of plasma renin activity(PRA) and aldosterone plasma concentration(p.c.) in intact and bilaterally nephrectomised(BN) dogs. We also studied correlations between aldosterone and cortisol p.c., having in view that both are stimulated by ACTH, searching in this way another modality for aldosterone secretion.

Aldosterone↗