Methods and apparatus for detecting and/or monitoring heart failure
First Claim
1. A method for use with an implantable device, the method comprising:
- extracting muscle sympathetic nerve activity over a period of time from a sensed implantable electrode signal; and
determining a level of heart failure based on the extracted muscle sympathetic nerve activity;
wherein the muscle sympathetic nerve activity is extracted by amplifying the sensed implantable electrode signal in the range between about 10,000 and about 100,000 and bandpass filtering the amplified activity signal on a musde sympathetic nerve activity bandpass range.
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Accused Products
Abstract
Methods and apparatuses are provided for assisting with the diagnosis, monitoring, and/or treatment of patients that are suffering from asymptomatic heart failure or may be susceptible to asymptomatic heart failure. The methods and apparatuses can be implemented with implantable devices. In certain implementations, a method is provided which includes sensing muscle sympathetic nerve activity using at least one nerve sensing electrode that is in electrical contact with a patient'"'"'s efferent muscle-nerve structure, acquiring a muscle sympathetic nerve activity signal from the sensed nerve activity using a nerve activity sensing circuit operatively coupled to the nerve sensing electrode, and analyzing the nerve activity signal for changes in nerve burst activity indicative of the presence and/or severity of asymptomatic heart failure.
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Citations
35 Claims
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1. A method for use with an implantable device, the method comprising:
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extracting muscle sympathetic nerve activity over a period of time from a sensed implantable electrode signal; and determining a level of heart failure based on the extracted muscle sympathetic nerve activity; wherein the muscle sympathetic nerve activity is extracted by amplifying the sensed implantable electrode signal in the range between about 10,000 and about 100,000 and bandpass filtering the amplified activity signal on a musde sympathetic nerve activity bandpass range. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An implantable device comprising:
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a housing; at least one implantable electrode that is operative to detect nerve activity; circuitry, at least partially arranged within the housing, and configured to sense nerve activity over a period of time using the at least one implantable electrode and extract muscle sympathetic nerve activity from the nerve activity; and control circuitry operatively coupled to the circuitry and configured to determine a level of heart failure based on the extracted muscle sympathetic nerve activity; wherein the circuitry is configured to extract a muscle sympathetic nerve activity signal by amplifying a nerve activity signal in the range between about 10,000 and about 100,000 and bandpass filtering the amplified nerve activity signal on a nerve activity bandpass range. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for detecting heart failure, the method comprising:
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sensing nerve activity using at least one nerve sensing electrode that is in electrical contact with a patient'"'"'s efferent muscle-nerve structure, and extracting a corresponding muscle sympathetic nerve activity signal; analyzing the muscle sympathetic nerve activity signal for changes in nerve burst activity over time; and determining a degree of heart failure based on the changes in nerve burst activity over time; wherein the muscle sympathetic nerve activity signal is extracted by receiving a nerve activity signal from the at least one nerve sensing electrode, amplifying the nerve activity signal in the range between about 10,000 and about 100,000, and bandpass filtering the amplified nerve activity signal on a nerve activity bandpass range. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An apparatus for detecting heart failure in a patient, the apparatus comprising:
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a nerve activity sensor operatively configurable to sense nerve activity within a patient and output a corresponding nerve activity signal; and control circuitry operatively coupled to the nerve activity sensor and configured to extract a muscle sympathetic nerve activity signal from the nerve activity signal and analyze the muscle sympathetic nerve activity signal for changes in nerve burst activity that is indicative of heart failure; wherein the control circuitry is configured to extract the muscle sympathetic nerve activity signal by amplifying the nerve activity signal in the range between about 10,000 and about 100,000 and bandpass filtering the amplified nerve activity signal on a nerve activity bandpass range. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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Specification