I knew when I heard the theme "Maps" I would some how be able to tie it into my explorations of the body. I considered brain mapping, but I wasn't crazy about the images I saw, so I went with cardiac mapping. Cardiac Mapping is preformed by inserting catheters into the heart and moving them around to different locations to identify where an arrhythmia starts. Once the doctors have identified the area, they zap it (technical term is ablation), to destroy the aberrant tissue. See my blog post for other background information.