GLOBAL CARDIAC PERFORMANCE
First Claim
1. A method for evaluating global cardiac performance, comprising:
- measuring dynamic intracardiac impedance over a time period;
identifying a first systolic event and a second systolic event from the time period;
evaluating an integral of the dynamic intracardiac impedance from about the first systolic event to about the second systolic event to determine a systolic performance parameter;
identifying a first diastolic event and a second diastolic event from the time period;
evaluating an integral of the dynamic intracardiac impedance from about the first diastolic event to about the second diastolic event to determine a diastolic performance parameter; and
determining global cardiac performance by comparing the systolic performance parameter with the diastolic performance parameter.
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Abstract
The present invention is related to implantable cardiac devices such as pacemakers and defibrillators that deliver cardiac resynchronization therapy (CRT), and to a method of optimizing acquisition of impedance signals between electrodes present on implanted lead systems. This system then automatically determines which electrodes or electrode combinations acquire impedance waveforms that have the best signal to noise ratio (highest fidelity) and characterize data most representative of dysynchronous electromechanical events. Using closed loop algorithms which provide electrograms and a variety of impedance data reflective of the patient'"'"'s clinical status, the system autonomously modifies interval timing within the CRT device.
67 Citations
16 Claims
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1. A method for evaluating global cardiac performance, comprising:
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measuring dynamic intracardiac impedance over a time period;
identifying a first systolic event and a second systolic event from the time period;
evaluating an integral of the dynamic intracardiac impedance from about the first systolic event to about the second systolic event to determine a systolic performance parameter;
identifying a first diastolic event and a second diastolic event from the time period;
evaluating an integral of the dynamic intracardiac impedance from about the first diastolic event to about the second diastolic event to determine a diastolic performance parameter; and
determining global cardiac performance by comparing the systolic performance parameter with the diastolic performance parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An implantable cardiac system comprising:
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an implantable cardiac device comprising a microprocessor; and
an electrical lead system configured to detect intracardiac impedance; and
wherein the implantable cardiac device is configured to;
a) identify a systolic impedance waveform and a diastolic impedance waveform from the intracardiac impedance;
b) generate at least one control signal using the systolic impedance waveform and the diastolic impedance waveform; and
c) set one or more operational parameters of the implantable cardiac device using said control signal. - View Dependent Claims (15, 16)
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Specification