Caval to abdominal aorta traversal. A 0.014″ guidewire is positioned in the inferior vena cava pointing toward the abdominal aorta. A loop snare is positioned at the abdominal aorta at the level of the calcium-free window identified in preprocedural computed tomography. Using a catheter electrosurgery technique, the guidewire is electrified and advanced into the abdominal aorta to the center of the snare.