[Stability of neurohumoral effects of losartan combined with metoprolol in chronic cardiac low output].

Combined therapy with lozartan and metoprolol in patients with chronic cardiac insufficiency has a consistent effect on the levels of epinephrine, angoitensin II, vasopressin, atrial naturiuretic factor, insulin, endothelline, thromboxane B2, guanosine monophosphate, 6-keto prostaglandin F1 alpha, and bradikinin. As to norepinephrine, there has been noted an inconsistent therapeutic effect. It is suggested that the time-related course of a long-term therapy might be associated with a formation of the aldosterone "escape" phenomenon.