Cardiac resynchronization using fusion promotion for timing management
First Claim
1. An implantable medical device (IMD) configured for use as part of a cardiac therapy system comprising a leadless cardiac pacemaker (LCP) and the IMD, the IMD comprising:
- a plurality of electrodes for sensing cardiac activity; and
operational circuitry configured to receive signals from the plurality of electrodes and analyze cardiac activity as follows;
sense a QRS complex; and
analyze the QRS complex to determine whether the QRS complex represents a fusion beat;
wherein the operational circuitry is further configured to communicate to the LCP that a pacing interval change is needed to attain fusion if the QRS complex does not represent a fusion beat;
wherein the operational circuitry is configured to analyze the QRS complex to determine whether the QRS complex represents a fusion beat by comparing the QRS complex to a template for a fusion beat.
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Accused Products
Abstract
Methods, systems and devices for providing cardiac resynchronization therapy (CRT) to a patient using a leadless cardiac pacemaker and an extracardiac device. The extracardiac device is configured to analyze one or more QRS complexes of the patient'"'"'s heart, determine whether fusion pacing is taking place, and, if not, to communicate with the leadless cardiac pacemaker to adjust intervals used in the CRT in order to generate desirable fusion of the pace and intrinsic signals. The extracardiac device may take the form of a subcutaneous implantable monitor, a subcutaneous implantable defibrillator, or other devices including wearable devices.
1208 Citations
15 Claims
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1. An implantable medical device (IMD) configured for use as part of a cardiac therapy system comprising a leadless cardiac pacemaker (LCP) and the IMD, the IMD comprising:
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a plurality of electrodes for sensing cardiac activity; and operational circuitry configured to receive signals from the plurality of electrodes and analyze cardiac activity as follows; sense a QRS complex; and analyze the QRS complex to determine whether the QRS complex represents a fusion beat; wherein the operational circuitry is further configured to communicate to the LCP that a pacing interval change is needed to attain fusion if the QRS complex does not represent a fusion beat; wherein the operational circuitry is configured to analyze the QRS complex to determine whether the QRS complex represents a fusion beat by comparing the QRS complex to a template for a fusion beat. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An implantable medical device (IMD) configured for use as part of a cardiac therapy system comprising a leadless cardiac pacemaker (LCP) and the IMD, the IMD comprising:
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a plurality of electrodes for sensing cardiac activity; and operational circuitry configured to receive signals from the plurality of electrodes and analyze cardiac activity as follows; sense a QRS complex; and analyze the QRS complex to determine whether the QRS complex represents a fusion beat; wherein the operational circuitry is further configured to communicate to the LCP that a pacing interval change is needed to attain fusion if the QRS complex does not represent a fusion beat; wherein the operational circuitry is configured to analyze the QRS complex to determine whether the QRS complex represents a left ventricular (LV) paced beat and to determine whether the pacing interval change is an increase or decrease as follows; if the QRS complex represents an LV paced beat, determining that the pacing interval change is an increase in the pacing interval;
orotherwise determining that the pacing interval change is a decrease in the pacing interval.
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8. An implantable medical device (IMD) configured for use as part of a cardiac therapy system comprising a leadless cardiac pacemaker (LCP) and the IMD, the IMD comprising:
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a plurality of electrodes for sensing cardiac activity; and operational circuitry configured to receive signals from the plurality of electrodes and monitor cardiac electrical signals to determine whether pacing therapy issued by the LCP is causing; a) one or more fusion beats; b) one or more pace captured beats;
orc) one or more intrinsic beats; and selectively communicating to the LCP to adjust pace timing if the pacing therapy is not causing one or more fusion beats. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification