A medical device of the type used for assisting a user in manually
delivering repetitive therapy to a patient (e.g., chest compressions or
ventilations in cardiac resuscitation), the device comprising a feedback
device configured to generate feedback cues to assist the user in timing
the delivery of the repetitive therapy, at least one sensor or circuit
element configured to detect actual delivery times, at which the user
actually delivers the repetitive therapy, and a processor, memory, and
associated circuitry configured to compare the actual delivery times to
information representative of desired delivery times to determine cue
times at which the feedback cues are generated by the feedback device.