Rate responsive pacemaker with exercise recovery using minute volume determination
First Claim
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1. A rate responsive implantable pacemaker for implantation in a patient, said pacemaker comprising:
- a cardiac sensor for sensing cardiac activity and for generating a cardiac activity signal;
a pace generator for generating pacing pulses in response to pacing commands;
a parameter sensor for sensing a metabolic demand parameter;
a parameter processing circuit for processing said metabolic demand parameter to generate a metabolic indicated parameter;
an exercise recovery identifying circuit for identifying when said patient is recovering from exercise, said exercise recovery circuit generating a corresponding recovery signal;
a controller receiving said cardiac activity signal, said exercise recovery signal and said metabolic indicated parameter for generating said pacing commands.
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Abstract
A rate responsive implantable pacemaker generates a metabolic demand parameter which is converted into a corresponding metabolic indicated parameter. The parameter is used to determine certain characteristics related to an exercise period and the patient, including exercise duration and intensity. These characteristics are used to dynamically calculate an exercise recovery period during which the pacing rate is elevated above a rate indicated by the metabolic parameter. Preferably, fuzzy logic circuitry is used for this purpose.
53 Citations
18 Claims
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1. A rate responsive implantable pacemaker for implantation in a patient, said pacemaker comprising:
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a cardiac sensor for sensing cardiac activity and for generating a cardiac activity signal; a pace generator for generating pacing pulses in response to pacing commands; a parameter sensor for sensing a metabolic demand parameter; a parameter processing circuit for processing said metabolic demand parameter to generate a metabolic indicated parameter; an exercise recovery identifying circuit for identifying when said patient is recovering from exercise, said exercise recovery circuit generating a corresponding recovery signal; a controller receiving said cardiac activity signal, said exercise recovery signal and said metabolic indicated parameter for generating said pacing commands. - View Dependent Claims (2, 3, 4)
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5. A rate responsive implantable pacemaker for implantation in a patient, said pacemaker comprising:
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a cardiac sensor for sensing cardiac activity and for generating a cardiac activity signal; a pace generator for generating pacing pulses in response to pacing commands; a parameter sensor for sensing a metabolic demand parameter; a parameter processing circuit for processing said metabolic demand parameter to generate a metabolic indicated parameter; an exercise sensor for sensing when said patient is performing an exercise having a duration and an intensity, said exercise sensor generating corresponding exercise signals identifying said duration and intensity of said exercise; and a controller receiving said cardiac activity signal, said exercise signals and said metabolic indicated parameter for generating said pacing commands. - View Dependent Claims (6, 7, 8)
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9. A rate responsive implantable pacemaker for implantation in a patient, said pacemaker comprising:
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a cardiac sensor for sensing cardiac activity and for generating a cardiac activity signal; a pace generator for generating pacing pulses in response to pacing commands; a parameter sensor for sensing a metabolic demand parameter; a parameter processing circuit for processing said metabolic demand parameter to generate a metabolic indicated parameter; an exercise sensor that senses when said patient is exercising and generates an end signal indicating that said patient has stopped exercising; a delay circuit for generating a delayed parameter by delaying said metabolic demand parameter when said end signal is generated by said exercise sensor; and a controller receiving said cardiac activity signal and said delayed parameter for generating said pacing commands. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification