Ventricular conduction delay trending system and method
First Claim
1. A cardiac pacemaker, comprising;
- an atrial sensing channel for sensing electrical events occurring in an atrium;
first and second ventricular sensing channels for sensing electrical events occurring at first and second ventricular locations;
a ventricular pacing channel and a controller for pacing a ventricle in response to sensed events and lapsed time intervals in a mode such that the ventricle is paced at a programmed AV interval after an atrial sense or pace;
circuitry for detecting R waves in the ventricular sensing channels following detection of a P wave due to a detected atrial depolarization;
circuitry for measuring first and second PR intervals associated with the first and second ventricular sensing channels, and calculating a conduction delay value as the difference between the first and second PR intervals; and
, wherein the controller is programmed to decrease or increase the programmed AV interval in accordance with an increase or decrease, respectively, of an average of conduction delays measured over a period of time.
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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 cardiac pacemaker, comprising;
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an atrial sensing channel for sensing electrical events occurring in an atrium;
first and second ventricular sensing channels for sensing electrical events occurring at first and second ventricular locations;
a ventricular pacing channel and a controller for pacing a ventricle in response to sensed events and lapsed time intervals in a mode such that the ventricle is paced at a programmed AV interval after an atrial sense or pace;
circuitry for detecting R waves in the ventricular sensing channels following detection of a P wave due to a detected atrial depolarization;
circuitry for measuring first and second PR intervals associated with the first and second ventricular sensing channels, and calculating a conduction delay value as the difference between the first and second PR intervals; and
,wherein the controller is programmed to decrease or increase the programmed AV interval in accordance with an increase or decrease, respectively, of an average of conduction delays measured over a period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification