Ventricular conduction delay trending system and method
First Claim
1. A method for operating a cardiac pacemaker, comprising:
- sensing electrical events occurring at an atrial location through an atrial sensing channel and at first and second ventricular locations through first and second ventricular sensing channels;
detecting a P wave from the atrial sensing channel;
detecting first and second R-waves from the first and second ventricular sensing channels;
measuring first and second PR intervals for the detected first and second R-waves; and
, calculating a conduction delay as the difference between the first and second PR intervals.
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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
22 Claims
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1. A method for operating a cardiac pacemaker, comprising:
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sensing electrical events occurring at an atrial location through an atrial sensing channel and at first and second ventricular locations through first and second ventricular sensing channels;
detecting a P wave from the atrial sensing channel;
detecting first and second R-waves from the first and second ventricular sensing channels;
measuring first and second PR intervals for the detected first and second R-waves; and
,calculating a conduction delay as the difference between the first and second PR intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. 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 associated logic circuitry for pacing a ventricle in response to sensed events and lapsed time intervals;
logic circuitry for detecting R waves in the ventricular sensing channels following detection of a P wave due to a detected atrial depolarization; and
,logic 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. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification