Implantable cardiac device for monitoring diastolic heart failure and method of operation and use thereof
First Claim
1. A method of monitoring a patient for diastolic heart failure with an implanted cardiac device, comprising:
- obtaining with the implanted cardiac device a waveform indicative of left ventricular pressure of the patient during an early part of isovolumetric relaxation;
calculating an indication of dispersion of relaxation from the waveform;
calculating a parameter from the waveform that is indicative of diastolic heart failure;
adjusting the parameter as a function of the indication of dispersion;
calculating an indication of diastolic heart failure from the adjusted parameter; and
adjusting a therapeutic action in response to the indication of diastolic heart failure and the indication of dispersion of relaxation.
1 Assignment
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Accused Products
Abstract
An implantable cardiac device is used to measure one or more parameters relating to cardiac activity of a patient'"'"'s heart, from which diastolic heart failure (“DHF”) may be monitored and/or detected. These parameters are used to calculate ventricular isovolumetric relaxation time or a related time value. Heart conditions possibly having an influence on the ventricular isovolumetric relaxation time, other than heart conditions due to reduced compliance, may be detected and used to prevent an incorrect calculation of the ventricular isovolumetric relaxation time. The parameters may be measured and the relaxation time calculated multiple times over a period of time, which enables monitoring of the progression of change in the relaxation time. The relaxation time and the progression of change therein are indicators of DHF.
58 Citations
18 Claims
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1. A method of monitoring a patient for diastolic heart failure with an implanted cardiac device, comprising:
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obtaining with the implanted cardiac device a waveform indicative of left ventricular pressure of the patient during an early part of isovolumetric relaxation; calculating an indication of dispersion of relaxation from the waveform; calculating a parameter from the waveform that is indicative of diastolic heart failure; adjusting the parameter as a function of the indication of dispersion; calculating an indication of diastolic heart failure from the adjusted parameter; and adjusting a therapeutic action in response to the indication of diastolic heart failure and the indication of dispersion of relaxation. - View Dependent Claims (2, 3, 4)
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5. A method of monitoring a patient for diastolic heart failure with an implanted cardiac device, comprising:
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obtaining with the implanted cardiac device at least one cardiac signal indicative of cardiac activity of the patient; calculating from the cardiac signal in the implanted cardiac device a ventricular isovolumetric relaxation time; obtaining an indication of a heart condition that is capable of influencing the ventricular isovolumetric relaxation time, other than reduced ventricular compliance; calculating an indication of diastolic heart failure from the ventricular isovolumetric relaxation time and the heart condition indication; and adjusting a therapeutic action in response to the indication of diastolic heart failure. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method of monitoring a patient for diastolic heart failure with a cardiac device implanted in the patient, comprising:
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obtaining with the implanted cardiac device a T wave ending time for a heart beat from an intracardiac electrogram; obtaining with the implanted cardiac device a return to baseline time of left ventricle pressure for the heart beat from a left ventricle pressure sensor; deriving a ventricular relaxation time for the heart beat from the T wave ending time and the return to baseline time; evaluating diastolic heart failure from the derived ventricular relaxation time; and adjusting a therapeutic action in response to the evaluation of diastolic heart failure. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An implantable cardiac device comprising:
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means for obtaining a T wave ending time from an intracardiac electrogram; means for obtaining a return to baseline time of left ventricle pressure from a left ventricle pressure sensor; means for deriving a ventricular relaxation time from the T wave ending time and the return to baseline time; and means for evaluating diastolic heart failure from the calculated ventricular relaxation time.
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18. An implantable cardiac device comprising:
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means for obtaining a waveform indicative of left ventricular pressure of the patient during an early part of isovolumetric relaxation, prior to a mitral valve opening; means for determining a parameter of the waveform obtained during the early part of isovolumetric relaxation; and means for calculating an indication of diastolic heart failure from the waveform parameter.
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Specification