Patent ID: 8005543

Claim:
A system, comprising: a stimulator adapted to deliver a stimulation signal for a heart failure therapy; a number of sensors adapted to sense at least a first parameter used to provide at least a first measurement of a heart failure status and sense at least a second parameter used to provide a second measurement of the heart failure status; and a controller connected to the stimulator and to the number of sensors, the controller being adapted to use the first and second measurements of the heart failure status to create a heart failure status index, and control the stimulator to modulate the stimulation signal for the heart failure therapy using the index, wherein the controller is configured to: use a dual feedback response to account for both long-term heart failure status changes and short-term heart failure status changes; provide a short-term index indicative of a short-term heart failure status to account for short-term heart failure status changes, wherein in providing the short-term index the controller is configured to use at least two measurements including the first measurement of the heart failure status; provide a long-term index indicative of a long-term heart failure status to account for long-term heart failure status changes, wherein providing the long-term index the controller is configured to use at least two measurements including the second measurement of the heart failure status to provide a long-term index indicative of a long-term heart failure status; control the stimulator to modulate the stimulation signal for the heart failure therapy using the short-term index and control the stimulator to modulate the stimulation signal for the heart failure therapy using the long-term index.