Bier Block (IV regional) – To administer this block the anesthesiologist first places a tourniquet on the extremity to be blocked.  A small intravenous catheter is then placed in that extremity.  After inflating the tourniquet the anesthesiologist administers numbing medicine to the extremity via the intravenous catheter.  This block numbs the extremity and is suitable for procedures on wrists, elbows and rarely legs.