System and method for automatically determining the slope of a transfer function for a rate-responsive cardiac pacemaker
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United States of America Patent
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May 7, 1996
Grant Date -
N/A
app pub date -
Jun 7, 1994
filing date -
Jun 7, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A rate-responsive pacemaker measures a patient's level of activity and stores the results in an activity level histogram. The patient's average level of activity is maintained as a running average. Based on a prescribed base pacing rate, a prescribed maximum pacing rate, the average level of activity, and the measured levels of activity stored in the activity level histogram, the rate-responsive pacemaker automatically calculates the slope of the pacemaker transfer function. An activity deviation histogram is also maintained. Analysis of the activity deviation histogram allows the pacemaker to determine if the patient was usually inactive for an extended period of time, and to inhibit an automatic slope calculation under such conditions. If a patient desires to reach a prescribed target heart rate during exercise, the slope may be calculated using the target heart rate and a prescribed fraction of time each week that the patient devotes to exercise.
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