Method and apparatus for trending a physiological cardiac parameter
First Claim
1. A method of predicting sudden cardiac death comprising:
- determining intra-cardiac impedance;
deriving at least one physiologic cardiac parameter from the determined impedance, the physiological cardiac parameter comprising an ejection fraction;
generating trended data by trending the derived physiologic cardiac parameter over spaced time intervals; and
predicting the onset of a sudden cardiac death episode using the trended data.
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Abstract
The present invention relates to an implantable cardioverter-defibrillator or pacemaker whose standard circuitry is used to trend a physiological cardiac parameter using intra-cardiac impedance measurements. The trend information may be used to predict the onset of a sudden cardiac death (SCD) event. By being able to predict the onset of an SCD event, patients and their physicians may be forewarned of a life-threatening event allowing them to respond accordingly. The trend information may also be used to predict the efficacy of cardiac-related medications, monitor progress of congestive heart failure, detect the occurrence of myocardial infarction, or simply track changes in sympathetic tone.
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Citations
20 Claims
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1. A method of predicting sudden cardiac death comprising:
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determining intra-cardiac impedance; deriving at least one physiologic cardiac parameter from the determined impedance, the physiological cardiac parameter comprising an ejection fraction; generating trended data by trending the derived physiologic cardiac parameter over spaced time intervals; and predicting the onset of a sudden cardiac death episode using the trended data. - View Dependent Claims (2)
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3. A method of predicting sudden cardiac death comprising:
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determining intra-cardiac impedance; deriving at least one physiologic cardiac parameter from the determined impedance, wherein the deriving comprises; deriving the at least one physiologic cardiac parameter when a patient is at rest; and deriving the at least one physiologic cardiac parameter when the patient is not at rest; detecting a difference between the at least one physiologic cardiac parameter when the patient is at rest and the at least one physiologic cardiac parameter when the patient is not at rest; trending the derived at least one physiologic cardiac parameter over spaced time intervals; and predicting the onset of a sudden cardiac death episode using the difference. - View Dependent Claims (4)
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5. A method of trending a cardiac parameter, comprising:
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measuring an intra-cardiac impedance; deriving a physiologic cardiac parameter using the measured impedance; and generating trend data by trending the derived parameter over time; and monitoring, using the trend data, at least one of a drug regimen, a progress of a congestive heart failure disease condition, and an occurrence of a myocardial infarction. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification