Systems and Methods for Activating and Controlling Impedance-Based Detection Systems of Implantable Medical Devices
First Claim
1. A method for use with an implantable medical device for implant within a patient, the method comprising:
- during an acute interval following device implant;
detecting a possible cardiac decompensation event within the patient using at least one detection parameter that is relatively insensitive to component encapsulation effects; and
following the acute interval, detecting possible cardiac decompensation using at least one detection parameter that is relatively more sensitive to component encapsulation effects.
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Abstract
Techniques are provided for use with implantable medical devices for addressing encapsulation effects, particularly in the detection of cardiac decompensation events such as heart failure (HF) or cardiogenic pulmonary edema (PE.) In one example, during an acute interval following device implant, cardiac decompensation is detected using heart rate variability (HRV), ventricular evoked response (ER) or various other non-impedance-based parameters that are insensitive to component encapsulation effects. During the subsequent chronic interval, decompensation is detected using intracardiac or transthoracic impedance signals. In another example, the degree of maturation of encapsulation of implanted components is assessed using impedance frequency-response measurements or based on the frequency bandwidth of heart sounds or other physiological signals. In this manner, impedance-based HF/PE detection systems can be activated as soon as component encapsulation has matured, without necessarily waiting until completion of a preset post-implant maturation interval, often set to forty-five days or more.
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Citations
20 Claims
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1. A method for use with an implantable medical device for implant within a patient, the method comprising:
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during an acute interval following device implant; detecting a possible cardiac decompensation event within the patient using at least one detection parameter that is relatively insensitive to component encapsulation effects; and following the acute interval, detecting possible cardiac decompensation using at least one detection parameter that is relatively more sensitive to component encapsulation effects. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for use with an implantable medical device for implant within a patient, the system comprising:
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an acute interval cardiac decompensation detection system operative during an acute interval following device implant to detect a possible cardiac decompensation event within the patient using one or more detection parameters that are relatively insensitive to component encapsulation effects; and a chronic interval cardiac decompensation detection system operative following the acute interval to detect a possible cardiac decompensation event within the patient using one or more detection parameters that are relatively more sensitive to component encapsulation effects.
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20. A system for use with an implantable medical device for implant within a patient, the system comprising:
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means, operative during an acute interval following device implant, for detecting a possible cardiac decompensation event within the patient using one or more detection parameters that are relatively insensitive to component encapsulation effects; and means, operative following the acute interval, for detecting a possible cardiac decompensation event within the patient using one or more detection parameters that are relatively more sensitive to component encapsulation effects.
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Specification