A method for performing a procedure at the fossa ovalis (107) in the septal wall (105) of the heart (100) includes the steps of providing a sheath (120) having a body wherein the body (120a) has a lumen extending therethrough and an open end at a distal end (126) of the body. The body also has at least one electrode (124) at the distal end of the body. The fossa ovalis in the septal wall is identified by using the at least one electrode of the sheath.
