Clinically, hypermetabolism of the liver accompanies the systemic resp
onse associated with trauma and sepsis, Although increased metabolism
is generally considered a beneficial response, a markedly increased he
patic oxygen consumption (HVO2) may be associated with adverse consequ
ences such as induction of centrilobular hypoxia, We studied the effec
ts of lactate and glucagon as inducers of increased HVO2 in the isolat
ed perfused rat liver to determine if hepatic functional derangements
could be precipitated by these trauma-associated factors at high metab
olic rates. HVO2 rose by 27%, 52%, and 70% in response to 5 mM lactate
/1 mM pyruvate, 20 nM glucagon, or both, respectively. In response to
these stimuli at a fixed perfusion rate, hepatic venous oxygen saturat
ion declined to 48 +/- 4% at the highest HVO2, and this was associated
with a reduced hepatic adenosine triphosphate content and fibrinogen
secretion. These findings indicate that hepatic metabolic disturbances
can result from hepatocellular hypoxia due to increased HVO2.