Hi, I think ketamine is the likely cause . You may try inhalation anesthesia with isoflurane. Make sure that the clamp does not occlude the IVC in addition to the portal triad. You may decrease the ischemia time if the mouse liver is steatotic, cirrhotic or cholestatic. Good Luck!!
Sorry, what is the question? I agree with both comments above. 70% resection does not kill the mice so even if all parenkyma is loss they should survive. It may be so that mediators from the reperfused liver do that...