Study of Fentanyl-Propofol-EMLA of L.M.X4 Technique for Bone Marrow Aspiration

St. Jude Children's Research Hospital is studying the best ways to prevent pain during and after procedures such as bone marrow aspiration and lumbar puncture with intrathecal (in the spinal fluid) chemotherapy. Researchers will study the effectiveness of combining anesthetics (medicines that help people sleep) and analgesics (medicines that relieve pain). Researchers believe that a combination of fentanyl (analgesic) and propofol (anesthetic), along with applying the skin-numbing-cream EMLA or L.M.X4™ on the area where the procedure is performed, will provide better pain control. Each patient enrolled on this study will have three different anesthetic combinations for three different procedures, in order to determine which combination worked best for each child.