Hepatic blood flow: accuracy of estimation from infusions of indocyanine green in anaesthetized cats
1987; Wiley; Volume: 91; Issue: 3 Linguagem: Inglês
10.1111/j.1476-5381.1987.tb11259.x
ISSN1476-5381
AutoresFrank J. Burczynski, C. V. Greenway, D. S. Sitar,
Tópico(s)Veterinary Pharmacology and Anesthesia
ResumoBritish Journal of PharmacologyVolume 91, Issue 3 p. 651-659 Free Access Hepatic blood flow: accuracy of estimation from infusions of indocyanine green in anaesthetized cats F.J. Burczynski, F.J. Burczynski Hepatorenal Research Unit and The Clinical Pharmacology Section, Department of Pharmacology and Therapeutics and the Department of Medicine, University of Manitoba, Winnipeg R3E 0W3, CanadaSearch for more papers by this authorC. V. Greenway, Corresponding Author C. V. Greenway Hepatorenal Research Unit and The Clinical Pharmacology Section, Department of Pharmacology and Therapeutics and the Department of Medicine, University of Manitoba, Winnipeg R3E 0W3, CanadaDepartment of Pharmacology, University of ManitobaSearch for more papers by this authorD.S. Sitar, D.S. Sitar Hepatorenal Research Unit and The Clinical Pharmacology Section, Department of Pharmacology and Therapeutics and the Department of Medicine, University of Manitoba, Winnipeg R3E 0W3, CanadaSearch for more papers by this author F.J. Burczynski, F.J. Burczynski Hepatorenal Research Unit and The Clinical Pharmacology Section, Department of Pharmacology and Therapeutics and the Department of Medicine, University of Manitoba, Winnipeg R3E 0W3, CanadaSearch for more papers by this authorC. V. Greenway, Corresponding Author C. V. Greenway Hepatorenal Research Unit and The Clinical Pharmacology Section, Department of Pharmacology and Therapeutics and the Department of Medicine, University of Manitoba, Winnipeg R3E 0W3, CanadaDepartment of Pharmacology, University of ManitobaSearch for more papers by this authorD.S. Sitar, D.S. Sitar Hepatorenal Research Unit and The Clinical Pharmacology Section, Department of Pharmacology and Therapeutics and the Department of Medicine, University of Manitoba, Winnipeg R3E 0W3, CanadaSearch for more papers by this author First published: July 1987 https://doi.org/10.1111/j.1476-5381.1987.tb11259.xCitations: 17AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract 1 Experiments were performed to determine the accuracy of the estimation of hepatic blood flow from infusions of indocyanine green (ICG) in anaesthetized cats. 2 The estimated flows were compared to hepatic blood flows measured directly in a hepatic venous long-circuit preparation. This preparation allowed direct measurement and alteration of hepatic blood flows, and collection of arterial and mixed hepatic venous blood samples without depletion of blood volume in the animal. 3 Mean hepatic plasma flows estimated during infusions of 3.22 and 6.44 nmol kg−1 min−1 were reliable indicators of true hepatic flow at three different flow levels, provided that a sufficiently long time (> 30 min) was allowed for distribution equilibrium and that data from several animals were pooled to reduce random variability. Variability arose through subtraction of plasma arterial and hepatic venous levels to obtain the arteriovenous difference. 4 Estimations of hepatic plasma flow by intravenous infusions of ICG were more accurate and reliable than estimations from bolus injections of ICG, or intravenous infusions of galactose studied previously. 5 The kinetics of hepatic uptake of ICG are complex. Extraction and clearance of ICG fell steadily with time during the infusions and constant plasma ICG levels were not attained during 150 min infusions. This is attributed to the effects of accumulation of ICG within the liver cells since hepatic uptake substantially exceeded biliary excretion rate. 6 Total ICG concentrations in sinusoid and liver cells increased in parallel. The concentration in the liver cell was 88 (60–115) times the concentration in the sinusoid but we have no data on whether or not the free concentrations in plasma and cell were in equilibrium. 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