Ventricular conduction delay trending system and method
First Claim
1. A method for operating a cardiac device, comprising:
- detecting first and second R-waves at first and second ventricular locations during an intrinsic ventricular beat;
calculating a ventricular conduction delay as the time interval between the occurrences of the first and second R-waves;
recording measurements of ventricular conduction delays taken over a period of time;
determining that a patient'"'"'s conduction system has improved if the ventricular conduction delays have gradually decreased over time;
determining that the patient'"'"'s conduction system has worsened if the ventricular conduction delays have gradually increased over time; and
,interpreting a sudden and sustained change in the ventricular conduction delays as being not related to a change in the patient'"'"'s conduction system.
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Abstract
A method and system for ascertaining the condition of the heart'"'"'s conduction system in a patient treated for congestive heart failure with pacing therapy. In accordance with the invention, changes in ventricular activation patterns are monitored over time in order to detect changes in the heart'"'"'s conduction system that may occur due to physiological regeneration of conduction pathways. The activation patterns are reflected by electrogram signals detected from different ventricular locations. By measuring the difference in conduction times of an excitation impulse traveling from the AV node to the different ventricular locations, a parameter representative of the heart'"'"'s conduction system is obtained that may be used to adjust the pacing therapy in accordance therewith.
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Citations
20 Claims
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1. A method for operating a cardiac device, comprising:
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detecting first and second R-waves at first and second ventricular locations during an intrinsic ventricular beat; calculating a ventricular conduction delay as the time interval between the occurrences of the first and second R-waves; recording measurements of ventricular conduction delays taken over a period of time; determining that a patient'"'"'s conduction system has improved if the ventricular conduction delays have gradually decreased over time; determining that the patient'"'"'s conduction system has worsened if the ventricular conduction delays have gradually increased over time; and
,interpreting a sudden and sustained change in the ventricular conduction delays as being not related to a change in the patient'"'"'s conduction system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cardiac device, comprising;
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first and second ventricular sensing channels for detecting first and second R-waves resulting from depolarizations occurring at first and second ventricular locations; circuitry for calculating a ventricular conduction delay as the time interval between the occurrences of the first and second R-waves; circuitry for recording measurements of ventricular conduction delays taken over a period of time; circuitry for determining that a patient'"'"'s conduction system has improved if the ventricular conduction delays have gradually decreased over time; circuitry for determining that the patient'"'"'s conduction system has worsened if the ventricular conduction delays have gradually increased over time; and
,circuitry for interpreting a sudden and sustained change in the ventricular conduction delays as being not related to a change in the patient'"'"'s conduction system. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification