[Renin plasmatic activity and plasma aldosterone in three cases of pheochromocytoma (author's transl)].

Renin Plasmatic Activity (R.P.A.) was increased in three cases of Pheochromocytoma Plasmatic aldosterone (A), measured in one patient, was high in the supine position and increased considerably in orthostatism. This was not observed with the R.P.A.7. Urine Tetra Hydroaldosterone (T.H.A.) was increased in two of the three patients and this increase corresponded to the Pheochromocytoma in which the V.M.A. concentrations were the highest. P.R.A., T.H.A. and V.M.A. regained normal values after surgery. We suggest that there is a certain parrallelism between the increase in the excretion of A. and the importance of the catécholamine release from the Pheocchromocytoma.