Changes in distribution of hepatic blood flow induced by intra-arterial infusion of angiotensin II in human hepatic cancer

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Abstract
Changes in the distribution of the hepatic blood flow induced by intra‐arterial infusion of angiotensin II (AT‐II) were studied in human hepatic cancers using extremely short‐lived radioisotope (RI) (krypton 81 m [81mKr]; half‐life, 13 seconds). After the start of continuous infusion of AT‐II, the radioactivity of the tumor showed about a two‐fold increase, whereas that of the nontumor region decreased to about one half as much as the level before the infusion. Consequently, the mean ratio of the arterial blood flow in the tumor region to that in the nontumor region (T/N ratio) increased to 3.30 (P < 0.001). The T/N ratio showed a peak before the peripheral blood pressure reached the maximum, and thereafter tended to decrease. Intra‐arterial infusion of AT‐II raised the T/N ratio more obviously than did intravenous infusion of the drug, with less rise in the peripheral blood pressure. It is believed that intra‐arterial infusion chemotherapy with local use of AT‐II enables better accessibility of chemotherapeutic drugs to tumors.