An electrode configured for placement in contact with a surface of a patients body, the electrode comprising: a flexible support and a plurality of electrode segments (65) which are supported by the flexible support to permit the electrode to conform to the surface of the patients body and separated by open spaces (68), wherein the electrode segments (65) comprise a conductive core (3) having a first side that faces the patient when the electrode is placed in contact with the patients body and a dielectric material (2) disposed on the first side of the conductive core (3) so as to insulate the conductive core (3) from the patients body when the electrode is placed in contact with the patients body, and the open spaces (68) are arranged in a pattern that permits portions of the surface of the patients body that are covered when the electrode is in a first position to become uncovered when the electrode is moved to a second position, thereby to permit moisture on the surface of the patients body to escape via the open spaces (68) when the electrode is placed in contact with the patients body, with the overall footprint of the electrode in the first and second positions being substantially the same.
