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  • Title: Increased plasma level of substance P in patients with severe congestive heart failure treated with ACE inhibitors.
    Author: Valdemarsson S, Edvinsson L, Ekman R, Hedner P, Sjöholm A.
    Journal: J Intern Med; 1991 Oct; 230(4):325-31. PubMed ID: 1717629.
    Abstract:
    The effects of angiotensin-converting-enzyme (ACE) inhibitors on circulatory regulating mechanisms in congestive heart failure (CHF) were studied by comparison of plasma levels of catecholamines, neuropeptide Y-like immunoreactivity (NPY-LI), substance P (SP-LI), calcitonin gene-related peptide (CGRP-LI), vasopressin (ADH-LI), atrial natriuretic peptide (ANP-LI) and renin activity (PRA) in patients with severe CHF (NYHA III-IV) with (n = 15) or without (n = 17) ACE inhibitors in addition to digoxin and diuretic therapy. Data were also compared with those for healthy subjects (n = 31) and patients with moderate CHF (NYHA I-II). Catecholamines and NPY-LI were increased to the same extent in both groups with severe CHF. CGRP-LI showed no changes relative to controls in any of the patient groups, and was not affected by ACE inhibitors. The SP-LI level was significantly increased in all patient groups. Patients with severe CHF on ACE inhibition had a SP-LI level of 4.05 +/- 0.79 pmol l-1, compared to a concentration of 2.28 +/- 0.30 pmol l-1 (P less than 0.05) in the patient group with a comparable degree of CHF but without ACE inhibition. In the latter group, an inverse relationship appeared between the SP-LI and the serum sodium levels (r = -0.68, P less than 0.05). The patients with severe CHF who received ACE inhibitors had significantly lower ADH-LI levels than the patients with a comparable degree of CHF who were not treated with ACE inhibitors, while the ANP-LI levels was increased to a similar extent in both groups.
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