An implantable medical electrical lead for electrical stimulation of body
tissue that includes at least one electrode; a lead body; and at least
one modifiable portion wherein the at least one modifiable portion can
exist in both a deflated configuration and an inflated configuration, and
wherein the inflated configuration exhibits a greater resistance to
movement of the lead within the body tissue than does the deflated
configuration. Kits, systems, and methods of using the leads are also
included.