Dynamic cardiac resynchronization therapy by tracking intrinsic conduction
First Claim
1. A method for operating a cardiac pacing device, comprising:
- sensing intrinsic atrioventricular intervals between an atrial event and a ventricular depolarization for at least one ventricle;
calculating an optimal AV delay based on the intrinsic atrioventricular intervals;
determining an atrial to early ventricular activation interval (AVEA);
calculating an early activation pacing interval for the ventricle by subtracting the AVEA from the calculated optimal AV delay;
sensing an early activation of the ventricle during a cardiac cycle;
starting the early activation pacing interval for the cardiac cycle responsive to sensing the early activation; and
delivering pacing to the at least one ventricle for the cardiac cycle relative to expiration of the early activation pacing interval.
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Abstract
Systems and methods for pacing the heart using resynchronization pacing delays that achieve improvement of cardiac function are described. An early activation pacing interval is calculated based on an optimal AV delay and an atrial to early ventricular activation interval between an atrial event and early activation of a ventricular depolarization. The early activation pacing interval for the ventricle is calculated by subtracting the measured AVEA from the calculated optimal AV delay. The early activation pacing interval is initiated responsive to sensing early activation of the ventricle and pacing is delivered relative to expiration of the early activation pacing interval.
241 Citations
18 Claims
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1. A method for operating a cardiac pacing device, comprising:
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sensing intrinsic atrioventricular intervals between an atrial event and a ventricular depolarization for at least one ventricle; calculating an optimal AV delay based on the intrinsic atrioventricular intervals; determining an atrial to early ventricular activation interval (AVEA); calculating an early activation pacing interval for the ventricle by subtracting the AVEA from the calculated optimal AV delay; sensing an early activation of the ventricle during a cardiac cycle; starting the early activation pacing interval for the cardiac cycle responsive to sensing the early activation; and delivering pacing to the at least one ventricle for the cardiac cycle relative to expiration of the early activation pacing interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A cardiac rhythm management device, comprising:
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electrodes configured to electrically coupled to multiple chambers of a heart; sensing circuitry configured to sense cardiac electrical signals via the electrodes and to detect cardiac signal features associated with cardiac events; measurement circuitry coupled to the sense circuitry and configured to measure one or more cardiac intervals, including an atrioventricular interval (AVI) between an atrial event and a ventricular depolarization for at least one ventricle and an atrial to early ventricular activation interval (AVEA) between an atrial event and early activation of a ventricular depolarization for the ventricle; optimization circuitry configured to calculate an optimal AV delay based on the measured atrioventricular intervals and to calculate an early activation pacing interval for the ventricle by subtracting the measured AVEA from the calculated optimal AVD; a pacing interval controller configured to start the early activation pacing interval responsive to sensing early activation of the ventricle; and pacing therapy circuitry configured to pace the ventricle relative to expiration of the early activation pacing interval. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification