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
Gastroenterologyjournal_title
Gastroenterologyauthors
Hickey PL,McLean AJ,Angus PW,Choo EF,Morgan DJdoi
10.1016/s0016-5085(96)70073-2subject
Has Abstractpub_date
1996-10-01 00:00:00pages
1039-48issue
4eissn
0016-5085issn
1528-0012pii
S0016-5085(96)70073-2journal_volume
111pub_type
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