Deriving patient activity information from sensed body electrical information
First Claim
1. A method of presenting physical activity information for an individual by detecting non-cardiac muscle noise in electrocardiogram (ECG) waveform information collected by an implanted medical device, the method comprising the steps of:
- a) implanting a medical device within a patient, the medical device comprising at least a first subcutaneous electrode implanted in or adjacent to the patient'"'"'s heart and a second subcutaneous electrode implanted in or adjacent to non-cardiac muscle or fascia tissue of the chest, abdomen, back or neck regions of the patient;
b) acquiring a composite electrical waveform from the first and second subcutaneous electrodes, the composite electrical waveform comprising cardiac derived electrical signals generated by cardiac activity of the heart and non-cardiac derived electrical signals including both psychological and physiological data generated by non-cardiac muscle or fascia tissue of the patient during each of a plurality of non-overlapping time periods;
c) post-processing at least two of the acquired composite electrical waveforms by performing the following operations;
i) selecting one of the plurality of non-overlapping time periods;
ii) identifying non-cardiac muscle activity events in the acquired composite electrical waveform that occurred during the selected time period;
iii) aggregating the non-cardiac muscle activity events identified in operation ii) to determine a period activity value that represents a level of electrical activity of the patient during the selected time period; and
iv) repeating operations i)-iii) for a second one of the time periods in the plurality of time periods; and
d) displaying to a user a representation of the period activity value for the at least two time periods.
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Accused Products
Abstract
Electrodes of a subcutaneous monitoring system receive body electrical signals that indicate both cardiac and non-cardiac muscle activity. In general, non-cardiac muscle activity is often correlated with physical activity, and physical activity is typically a strong indicator of patient health. Exemplary systems and methods that detect non-cardiac muscle activity information in sensed body electrical waveforms may provide a diagnostic tool for monitoring physical activity level over time in patients that have subcutaneous monitoring systems. In an illustrative embodiment, systems and methods for presenting patient activity information in a graphical format over intervals of time include processing ECG waveform information to identify and to accumulate non-cardiac muscular activity information during each of the intervals of time. In various implementations, number, intensity, and/or duration of the events that are identified during a time interval may be accumulated and stored for subsequent recall.
55 Citations
17 Claims
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1. A method of presenting physical activity information for an individual by detecting non-cardiac muscle noise in electrocardiogram (ECG) waveform information collected by an implanted medical device, the method comprising the steps of:
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a) implanting a medical device within a patient, the medical device comprising at least a first subcutaneous electrode implanted in or adjacent to the patient'"'"'s heart and a second subcutaneous electrode implanted in or adjacent to non-cardiac muscle or fascia tissue of the chest, abdomen, back or neck regions of the patient; b) acquiring a composite electrical waveform from the first and second subcutaneous electrodes, the composite electrical waveform comprising cardiac derived electrical signals generated by cardiac activity of the heart and non-cardiac derived electrical signals including both psychological and physiological data generated by non-cardiac muscle or fascia tissue of the patient during each of a plurality of non-overlapping time periods; c) post-processing at least two of the acquired composite electrical waveforms by performing the following operations; i) selecting one of the plurality of non-overlapping time periods; ii) identifying non-cardiac muscle activity events in the acquired composite electrical waveform that occurred during the selected time period; iii) aggregating the non-cardiac muscle activity events identified in operation ii) to determine a period activity value that represents a level of electrical activity of the patient during the selected time period; and iv) repeating operations i)-iii) for a second one of the time periods in the plurality of time periods; and d) displaying to a user a representation of the period activity value for the at least two time periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of presenting physical activity information for an individual by detecting non-cardiac muscle noise in electrocardiogram (ECG) waveform information collected by an implanted medical device, the method comprising the steps of:
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a) implanting a medical device within a patient, the medical device comprising at least a first subcutaneous electrode implanted in or adjacent to the patient'"'"'s heart and a second subcutaneous electrode implanted in or adjacent to non-cardiac muscle or fascia tissue of the chest, abdomen, back or neck regions of the patient; b) acquiring electrical waveforms from the first and second subcutaneous electrodes, the electrical waveforms comprising electrical activity signals generated by cardiac activity of the heart and non-cardiac electrical activity signals including both psychological and physiological data generated by the muscle or fascia tissue of the patient during each of a plurality of non-overlapping time periods; c) post-processing at least two of the acquired electrical waveforms of the cardiac electrical activity signals and of the non-cardiac electrical activity signals by performing the following operations; i) selecting one of the plurality of non-overlapping time periods; ii) identifying non-cardiac muscle activity events in the acquired electrical waveforms that occurred during the selected time period; iii) aggregating the non-cardiac muscle activity events identified in operation ii) to determine a period activity value that represents a level of electrical activity of the patient during the selected time period; and iv) repeating operations i)-iii) for a second one of the time periods in the plurality of time periods; and d) displaying to a user a representation of the period activity value for the at least two time periods.
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Specification