one side and a conductive gel layer 150 on the other side as discussed in more detail below the conductive layer 120 dielectric layer 130 and gel layer 150 together from the electrode pad 10 the electrode pad 10 is electrically connected to an interface 40 by wires 42 the interface 40 is for example an adapter for connecting the electrode assembly to a defibrillator further information about connector assembly is an available in u s pat no 5 967 817 to greenstein for medical connector apparatus the specification of which is incorporated herein in yet another embodiment a single element separable into three conductive elements could be used in one example the three separable conductive elements are nested i e a first conductive area surrounded by a second conductive area surrounded by a third conductive area although as will be appreciated by those of skill in the art nesting of the conductive elements is not necessary to practice the invention as long as the combination of surface areas of the conductive elements are effective for the application in this scenario the first inner most separable conductive element would be sized for infants the combination of the inner most conductive element with a middle conductive element would be sized for children i e under 8 years of age finally the combination of all three elements inner middle and outer would be sized for adult therapy alternatively each separable element could be independently sized for therapy delivery in this case the inner most conductive element would be sized for infants the middle conductive element would be sized for children and the third element would be sized for adults in the embodiment shown in fig1 the inner conductive element 22 is used to deliver therapy.