A pacemaker or other implantable cardiac stimulation device is configured with both a rate hysteresis mode and a vasovagal syncope prevention mode. The locating connections can be in the form of cam devices or tool-less connections formed by snap fitting devices as well as tool-less cam devices. The issuer sends an authorization response message indicating that the authorization request is approved or not approved. The punch-through diode allows bipolar operation of a cross-point memory array. The OLED includes at least a substrate, a cathode, an anode, one or more organic light-emissive materials disposed between the cathode and anode, and a gradient refractive index film disposed on an external, light emitting surface of the device, for example on the substrate layer.