Adjustment of the breakpoint of the rate response curve based on minute ventilation values
First Claim
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1. A method for adjusting the responsiveness of a rate-adaptive pacemaker operating in a patient, wherein measured minute ventilation values in the patient are mapped to a pacing rate by a dual-slope rate response curve, comprising:
- measuring minute ventilation values and determining that an average of those minute ventilation values are increasing, signifying that the patient'"'"'s exertion level is increasing;
determining an amplitude of an oscillatory component in the measured minute ventilation values to be above a specified threshold value; and
,if the amplitude of the oscillatory component falls below the specified threshold value as the average minute ventilation continues to increase, setting the breakpoint of the rate response curve equal to the presently measured minute ventilation value.
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Abstract
A method and system for operating a rate-adaptive pacemaker utilizing minute ventilation to measure exertion level. The method is applicable to heart failure patients who exhibit an oscillatory minute ventilation pattern.
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20 Claims
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1. A method for adjusting the responsiveness of a rate-adaptive pacemaker operating in a patient, wherein measured minute ventilation values in the patient are mapped to a pacing rate by a dual-slope rate response curve, comprising:
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measuring minute ventilation values and determining that an average of those minute ventilation values are increasing, signifying that the patient'"'"'s exertion level is increasing; determining an amplitude of an oscillatory component in the measured minute ventilation values to be above a specified threshold value; and
,if the amplitude of the oscillatory component falls below the specified threshold value as the average minute ventilation continues to increase, setting the breakpoint of the rate response curve equal to the presently measured minute ventilation value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A rate-adaptive pacemaker, comprising;
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sensing and pacing channels for sensing cardiac depolarizations and delivering paces to a selected chamber; a minute ventilation sensor, a controller for controlling the delivery of paces in accordance with a pacing mode at a programmed pacing rate, wherein measured minute ventilation values in the patient are mapped to a pacing rate by a dual-slope rate response curve; wherein the controller is configured to determine if an amplitude of an oscillatory component in the measured minute ventilation values is above a specified threshold value and, if the amplitude of the oscillatory component falls below the specified threshold value as an average minute ventilation continues to increase, to set the breakpoint of the rate response curve equal to the presently measured minute ventilation value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification