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Preventing internal hemorrhage extends the lifespan of rats with chronic bile duct ligation (CBDL), a common animal model of portal hypertension. We investigated hemodynamics during the early and late stages of cirrhosis caused by CBDL. We also evaluated the hemodynamic influence of NO, which is the chief vasodilator in hyperdynamic syndrome, by administration of an NO synthase inhibitor (N(G)-nitro-L-arginine methyl ester: L-NAME; 10 mg/kg). ANIMALS/METHODS: In 24 Sprague-Dawley rats (9 sham rats and 15 CBDL rats), hemodynamics were assessed under conscious and unrestrained conditions 4 and 8 weeks after surgery. Before and 30 minutes after L-NAME administration, the cardiac index (CI) and regional blood flow were measured with the reference sample method using (141)Ce- and (113)Sn-microspheres (15 µm in diameter).

Inhibition of Nitric Oxide Synthase in Hyperdynamic Circulation of Rats with Early or Late Cirrhosis Secondary to Common Bile Duct Ligation