Increased sensitivity of propranolol clearance to reduced oxygen delivery in the isolated perfused cirrhotic rat liver.

Abstract:

BACKGROUND & AIMS:Capillarization of the sinusoids in cirrhosis is proposed to reduce oxygen availability to the hepatocyte, resulting in the patterns of altered drug metabolism observed in cirrhosis. If this were true, drug metabolism in cirrhotic livers would be expected to be more sensitive to reduced oxygen delivery than in noncirrhotic livers. The aim of this study was to compare the sensitivity of propranolol clearance with reduced oxygen delivery in isolated perfused livers from healthy and cirrhotic rats. METHODS:Propranolol clearance was measured at steady state in 5 normal and 5 cirrhotic weight-matched perfused rat livers under single-pass conditions with normal oxygen delivery (mean, 71.5 mumol/min) and with graded reductions in oxygen delivery (range, 58.1-18.8 mumol/min). RESULTS:In noncirrhotic livers, propranolol clearance was independent of oxygen supply for the oxygen delivery range of 73-45 mumol/min but decreased with further reductions in oxygen supply. In cirrhotic livers, propranolol clearance decreased linearly (r2 = 0.92; P < 0.005) for the entire oxygen delivery range (73.4-18.8 mumol/min). CONCLUSIONS:The increased sensitivity of propranolol clearance in perfused cirrhotic livers to reductions in oxygen delivery is consistent with impaired oxygen delivery to hepatocytes in cirrhosis. These novel findings potentially hold implications for clinical management of patients with cirrhosis.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Hickey PL,McLean AJ,Angus PW,Choo EF,Morgan DJ

doi

10.1016/s0016-5085(96)70073-2

subject

Has Abstract

pub_date

1996-10-01 00:00:00

pages

1039-48

issue

4

eissn

0016-5085

issn

1528-0012

pii

S0016-5085(96)70073-2

journal_volume

111

pub_type

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