Implanted cardiac device with means for classifying patient condition
First Claim
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1. An implantable rate responsive pacemaker comprising:
- a sensor for sensing intrinsic cardiac events and generating a corresponding sensed signal;
a pacing generator generating pacing signals in response to commands;
a metabolic demand sensor for sensing a physiological demand of the patient from a physiological characteristic, and generating in response a metabolic indicated pacing parameter;
a controller receiving said sensed signal and said metabolic indicated pacing parameter and generating said commands; and
a classifier for generating an index indicative of a degree of congestive heart failure in said patient, said classifier including means for analyzing said physiological demand.
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Abstract
An implantable rate responsive pacemaker uses the physiological demand parameter to determine the classification of the patient (i.e., his degree of congestive heart failure). For this purpose, the parameter is monitored for extended time periods (i.e., several days) to determine the levels for said parameter corresponding to different levels of physical activity, such as maximum physical activity or rest. The variation in these levels is then translated into corresponding classification (0-IV) using a preselected criteria.
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Citations
21 Claims
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1. An implantable rate responsive pacemaker comprising:
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a sensor for sensing intrinsic cardiac events and generating a corresponding sensed signal; a pacing generator generating pacing signals in response to commands; a metabolic demand sensor for sensing a physiological demand of the patient from a physiological characteristic, and generating in response a metabolic indicated pacing parameter; a controller receiving said sensed signal and said metabolic indicated pacing parameter and generating said commands; and a classifier for generating an index indicative of a degree of congestive heart failure in said patient, said classifier including means for analyzing said physiological demand. - View Dependent Claims (2, 3, 4, 5)
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6. A rate responsive implantable pacemaker comprising:
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an intrinsic sensor for sensing intrinsic cardiac activity in a patient'"'"'s heart, said intrinsic sensor generating in response sensed signals; a pace generator for generating pacing signals in response to pacing commands; a physiological sensor for sensing a metabolic demand of said patient based on a physiological characteristic of the patient; a mapping circuit for mapping said metabolic demand into a corresponding metabolic pacing parameter; a patient classifier for generating an indicia corresponding to a degree of congestive heart failure in a patient from said metabolic demand; and a controller receiving said sensed signals, said metabolic pacing parameter and generating said pacing commands. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of determining the CHF classification of a patient comprising the steps of:
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measuring a physiological parameter related to the metabolic demand; determining a variation of said parameter as a function of various levels of physical activity; and correlating said variation to a particular degree of classification. - View Dependent Claims (18, 19, 20, 21)
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Specification