METHOD AND APPARATUS FOR TRENDING A PHYSIOLOGICAL CARDIAC PARAMETER
First Claim
1. A system for monitoring congestive heart failure, the system comprising:
- a measuring device configured to measure intra-cardiac impedance;
a derivation module configured to derive a physiologic cardiac parameter from the measured impedance;
a trending module configured to trend the derived parameter over spaced time intervals to create trended parameter data; and
an analyzing module configured to analyze the trended parameter data and monitor congestive heart failure status from the analysis.
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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 system for monitoring congestive heart failure, the system comprising:
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a measuring device configured to measure intra-cardiac impedance; a derivation module configured to derive a physiologic cardiac parameter from the measured impedance; a trending module configured to trend the derived parameter over spaced time intervals to create trended parameter data; and an analyzing module configured to analyze the trended parameter data and monitor congestive heart failure status from the analysis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for trending a physiologic cardiac parameter, the device comprising:
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an impedance module configured to measure an intra-cardiac impedance at spaced time intervals; a derivation module configured to derive the physiologic cardiac parameter using the measured impedance; a trending module configured to generate trended parameter data using the derived physiologic cardiac parameter; and an analyzing module configured to analyze the trended parameter data and monitor congestive heart failure status from the analysis. - View Dependent Claims (12, 13, 14, 15)
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16. A device-readable medium comprising instructions that, when performed by a previously-implanted medical device, cause the device to perform acts comprising:
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measuring an intra-cardiac impedance at spaced time intervals; deriving a physiologic cardiac parameter using the measured impedance; generating trended parameter data using the derived physiologic cardiac parameter; and analyzing the trended parameter data; and monitoring congestive heart failure status from the analysis. - View Dependent Claims (17, 18, 19, 20)
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Specification