Ariel Sharon has been rushed back into the operating room after undergoing a brain scan. The director of Jerusalem’s Hadassah hospital confirmed Israeli media reports that the prime minister is having surgery to stem further bleeding. It is the 77 year-old’s third separate operation. “Predicting the future at this time is impossible,” said Dr Shlomo Mor-Yosef. There was no change in his health overnight. This morning doctors ran a new round of tests to evaluate the damage he may have sustained.Sharon is in a medically induced coma after suffering a severe stroke and a brain haemorrhage on Wednesday night. Medics say they will probably keep him sedated at least until Sunday to give him the best chance of survival. If he pulls through, it is highly unlikely he will have retained enough of his mental faculties to continue in politics. Sharon’s illness comes as Israel prepares for a general election in March.