Cardiac rhythm management system with prevention of double counting of events
First Claim
1. A method of operating a pacemaker, comprising:
- sensing right and left ventricular depolarizations through a single channel;
implementing a programmable timing interval to determine that two successive ventricular events occur in different ventricular chambers; and
delivering or withholding pacing therapy based on the determination that the two successive ventricular events occur in different ventricular chambers.
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Abstract
A cardiac rhythm management system recognizes patterns of interval durations, distinguishing between events in different heart chambers even though signals associated with those different heart chambers are processed using a commonly shared sensing circuit. A therapy delivery algorithm ignores intervals between cardiac events occurring in different heart chambers when determining a cardiac rate upon which the delivery of therapy is based. This reduces the risk of inappropriate delivery of therapy to the patient. Delayed conduction left ventricular beats are not erroneously recognized as a subsequent right ventricular beat, preventing such short intervals from inappropriately triggering a defibrillation countershock.
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Citations
12 Claims
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1. A method of operating a pacemaker, comprising:
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sensing right and left ventricular depolarizations through a single channel; implementing a programmable timing interval to determine that two successive ventricular events occur in different ventricular chambers; and delivering or withholding pacing therapy based on the determination that the two successive ventricular events occur in different ventricular chambers. - View Dependent Claims (2, 3, 4, 5)
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6. An implantable cardiac device, comprising:
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a sensing circuit configured to sense cardiac events through a single channel, the cardiac events including right and left ventricular depolarizations; a timer configured to implement a programmable timing interval between right and left ventricular depolarizations; a pattern recognition module configured to use the timing interval to recognize a pattern of the durations of intervals between the cardiac events; and control circuitry configured to control delivery of cardiac therapy contingent on the recognized pattern; a therapy circuit configured to deliver cardiac therapy contingent on whether or not two successive ventricular events occur in different ventricular chambers during a cardiac cycle. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification