Abnormalities in liver blood flow are known to occur in patients and animals with overt hepatic tumour. This study investigated the changes in liver blood flow associated with the development of overt hepatic tumour in two different models. Hepatic tumour was induced by intraportal inoculation of either 300 LV10 sarcoma cells or 10(5) MC28 sarcoma cells in rats. Liver blood flow and hepatic haemodynamics were measured 3 weeks later when overt liver tumour was present. The hepatic perfusion index (HPI), the ratio of hepatic arterial to total liver blood flow, was raised and portal venous inflow reduced in rats with LV10 tumours, but not in those with MC28 lesions. Hepatic arterial flow was unchanged in LV10 tumours when the HPI was raised and neither model demonstrated arteriosystemic or portosystemic shunting. The changes in portal venous inflow were associated with a significant increase in portal and splanchnic vascular resistance. These studies suggest that liver blood flow changes in the presence of overt hepatic tumour are not related to portal venous obstruction but may be caused by a circulating splanchnic vasoconstrictor.
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