A system for detecting a concurrent electrical therapy applied to a patient, comprising: an implantable medical device configured to be implanted in the patient and configured to detect the concurrent electrical therapy, wherein the concurrent electrical therapy includes a plurality of electrical therapy pulses, wherein the IMD includes: a storage, wherein the storage includes at least one characteristic of the therapy pulses in the concurrent electrical therapy; concurrent therapy detection circuitry configured to detect electrical pulses and for use to extract at least one characteristic of the detected electrical pulses; and a controller configured to compare the at least one characteristic of the detected electrical pulses to the at least one stored characteristic of the therapy pulses and to declare that the concurrent therapy is being applied to the patient if the at least one characteristic of the detected electrical pulses favorably compare to the at least one stored characteristic of the therapy pulses, wherein the concurrent therapy detection circuitry includes a high frequency filter configured to transform the detected electrical pulses into a transformed signal, wherein the transformed signal includes pulses corresponding to rising or falling edges of the detected electrical pulses. an implantable medical device configured to be implanted in the patient and configured to detect the concurrent electrical therapy, wherein the concurrent electrical therapy includes a plurality of electrical therapy pulses, wherein the IMD includes: a storage, wherein the storage includes at least one characteristic of the therapy pulses in the concurrent electrical therapy; concurrent therapy detection circuitry configured to detect electrical pulses and for use to extract at least one characteristic of the detected electrical pulses; and a controller configured to compare the at least one characteristic of the detected electrical pulses to the at least one stored characteristic of the therapy pulses and to declare that the concurrent therapy is being applied to the patient if the at least one characteristic of the detected electrical pulses favorably compare to the at least one stored characteristic of the therapy pulses, wherein the concurrent therapy detection circuitry includes a high frequency filter configured to transform the detected electrical pulses into a transformed signal, wherein the transformed signal includes pulses corresponding to rising or falling edges of the detected electrical pulses. a storage, wherein the storage includes at least one characteristic of the therapy pulses in the concurrent electrical therapy; concurrent therapy detection circuitry configured to detect electrical pulses and for use to extract at least one characteristic of the detected electrical pulses; and a controller configured to compare the at least one characteristic of the detected electrical pulses to the at least one stored characteristic of the therapy pulses and to declare that the concurrent therapy is being applied to the patient if the at least one characteristic of the detected electrical pulses favorably compare to the at least one stored characteristic of the therapy pulses, wherein the concurrent therapy detection circuitry includes a high frequency filter configured to transform the detected electrical pulses into a transformed signal, wherein the transformed signal includes pulses corresponding to rising or falling edges of the detected electrical pulses.