An improved program status register is disclosed with a feature to handle state change for a processor and its memory subsystem. The elongated body is at least partially insertable into a medullary canal of a humerus and has a proximal part with a plurality of orifices. Information descriptive of the narrow band interferer is obtained, and interference caused by the narrow band interferer is reduced based on the information and according to the mitigation strategy. The housing is sealed with respect to external elements.