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  • Title: Effects of nitric oxide synthase inhibition on the hemodynamic changes in hyperdynamic endotoxemia.
    Author: Wolfárd A, Kaszaki J, Szabó C, Balogh Z, Nagy S.
    Journal: Acta Chir Hung; 1997; 36(1-4):393-4. PubMed ID: 9408415.
    Abstract:
    In this study we compared the circulatory effects of the arginine analogue non-specific nitric oxide synthase (NOS) inhibitor N omega-nitro-L-arginine (NNA), and the specific inducible NOS (iNOS) inhibitor S-methylisothiourea (SMT) and S-(2-aminoethyl)-isothiourea (AEST) in a hyperdynamic endotoxemic dog model. Mean arterial pressure (MAP), cardiac output (CO), and myocardial contractility (MC) were measured. A hyperdynamic circulatory response was elicited with a 2-h infusion of a total dose of 5.3 micrograms/kg E. coli endotoxin (ETX). NOS inhibitory treatment (2 mg/kg) was administrated from the 45th min of endotoxemia. ETX induced a hyperdynamic circulatory response, and a significant myocardial depression. NNA induced a prolonged, SMT a transient increase in MC, both drugs elevated MAP, but decreased CO. AEST significantly prolonged the elevation in CO, but did not affect MAP. Selective inhibition of the iNOS may be a beneficial in sepsis.
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