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Degradable starch microspheres (DSM, Spherex) have been shown to cause intermittent blockage of hepatic arterial flow and to increase the concentration of regionally injected cytotoxics. The Spherex monitoring system has been developed by Pharmacia, Sweden to establish the correct dose of DSM to optimize hepatic arterial blockade. Groups of normal rats received varying dosages of DSM and co-injected methylene diphosphonate (MDP) in order to reproduce the effect of reduction of passing fraction and marker flow rate as determined by the Spherex monitoring system. A flow reduction and significant decrease in passing fraction was achieved on injection of 4 mg of DSM via the hepatic artery.
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