Methods and systems that monitor for an impending myocardial infarction
First Claim
1. For use with an implanted system, a method for monitoring for an impending myocardial infarction (MI), the method comprising:
- (a) using an implanted photoplethysmography sensor remote from the patient'"'"'s heart to produce a photoplethysmography signal that is indicative of changes in arterial volume;
(b) for each of a plurality of periods of time, determining a metric indicative of the area under the curve of the photoplethysmography signal for the period of time;
(c) monitoring for an impending MI based on changes in the metric indicative of the area under the curve of the photoplethysmography signal; and
(d) triggering an alert and/or therapy in response to an impending MI being detected at step (c);
wherein one or more of steps (b), (c) and (d) is/are performed using a processor.
1 Assignment
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Accused Products
Abstract
Implantable systems, and methods for use therewith, are provided for monitoring for an impending myocardial infarction. A signal indicative of changes in arterial blood volume is obtained. Such a signal can be a photoplethysmography signal or an impedance plethysmography signal. For each of a plurality of periods of time, a metric indicative of the areas under the curve of the signal or number of inflections in the signal is determined. An impending myocardial infarction is monitored for based on changes in the metric indicative of the area under the curve of the signal or number of inflections in the signal, and an alert and/or therapy is triggered in response to an impending myocardial infarction being predicted.
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Citations
22 Claims
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1. For use with an implanted system, a method for monitoring for an impending myocardial infarction (MI), the method comprising:
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(a) using an implanted photoplethysmography sensor remote from the patient'"'"'s heart to produce a photoplethysmography signal that is indicative of changes in arterial volume; (b) for each of a plurality of periods of time, determining a metric indicative of the area under the curve of the photoplethysmography signal for the period of time; (c) monitoring for an impending MI based on changes in the metric indicative of the area under the curve of the photoplethysmography signal; and (d) triggering an alert and/or therapy in response to an impending MI being detected at step (c); wherein one or more of steps (b), (c) and (d) is/are performed using a processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable system for monitoring for an impending myocardial infarction (MI), comprising:
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an implantable photoplethysmography sensor configured to be implanted remote from a patient'"'"'s heart and to produce a photoplethysmography signal that is indicative of changes in arterial volume; a monitor configured to; determine a metric indicative of the area under the curve of the photoplethysmography signal for each of a plurality of periods of time, monitor for an impending MI based on changes in the metric indicative of the area under the curve of the photoplethysmography signal, and trigger an alert and/or therapy in response to an impending MI being detected. - View Dependent Claims (13, 14)
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15. For use with a chronically implanted device, a method for monitoring for an impending myocardial infarction (MI), the method comprising:
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(a) using an implanted photoplethysmography sensor remote from a patient'"'"'s heart to produce a photoplethysmography signal that is indicative of changes in arterial volume; (b) for each of a plurality of cycles of the photoplethysmography signal, determining a metric indicative of a number of inflections in the photoplethysmography signal for the cycle; (c) monitoring for an impending MI based on changes in the metric indicative of the number of inflections in the photoplethysmography signal; and (d) triggering an alert and/or therapy in response to an impending MI being detected at step (c); wherein one or more of steps (b), (c) and (d) is/are performed using a processor. - View Dependent Claims (16, 17, 18, 19, 20)
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21. An implantable system for monitoring for an impending myocardial infarction (MI), comprising:
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an implantable photoplethysmography sensor configured to be implanted remote from a patient'"'"'s heart and to produce a photoplethysmography signal that is indicative of changes in arterial volume; a monitor configured to determine, for each of a plurality of cycles of the photoplethysmography signal, a metric indicative of a number of inflections in the photoplethysmography signal for the cycle, monitor for an impending MI based on changes in the metric indicative of the number of inflections in the photoplethysmography signal, and trigger an alert and/or therapy in response to an impending MI being detected. - View Dependent Claims (22)
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Specification