Israeli Prime Minister Ariel Sharon will be readmitted to hospital later this week to undergo a procedure to repair a small hole in the heart, his office said yesterday. Doctors at the Hadassah hospital on the outskirts of Jerusalem will on Thursday perform a cardiac catheterization in order to fix the minor birth defect. The operation is aimed to avoid any further clotting which caused the 77-year-old premier to suffer a minor stroke two weeks ago.