Method and apparatus to ensure consistent left ventricular pacing
First Claim
1. A cardiac therapy system capable of delivering cardiac resynchronization therapy (CRT) that includes pacing at least the left ventricle, the system comprising:
- electrodes configured to electrically couple to right and left ventricles;
sensing circuitry configured to sense cardiac signals via the electrodes, the cardiac signals including intrinsic depolarization signals;
pacing circuitry configured to generate pacing pulses deliverable through the electrodes;
cardiac response classification circuitry configured to determine cardiac responses to the pacing pulses; and
pacing control circuitry configured to control the pacing circuitry, the pacing control circuitry configured to schedule delivery of CRT pacing to at least one ventricle relative to a pacing delay for the ventricle during a cardiac cycle, and, if an intrinsic depolarization is detected during the pacing delay, to inhibit the scheduled CRT pacing to the ventricle, to measure an intrinsic interval of the ventricle, which is concluded by the intrinsic depolarization, and to decrease a subsequent pacing delay of the ventricle for a subsequent cardiac cycle to be less than or equal to the measured intrinsic interval, wherein to measure the intrinsic interval and to decrease the subsequent pacing delay are performed on a beat by beat basis.
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Accused Products
Abstract
A method of operating a cardiac therapy system to deliver cardiac resynchronization therapy (CRT) pacing that includes pacing both ventricles or pacing only the left ventricle is described. Delivery of the CRT pacing to one or both ventricles is scheduled for a cardiac cycle. If an intrinsic depolarization of a ventricle is detected during a pacing delay of the ventricle, then the scheduled CRT pacing to the ventricle is inhibited for the cycle. The intrinsic interval of the ventricle, such as the intrinsic atrioventricular interval concluded by the intrinsic depolarization, is measured. During a subsequent cardiac cycle, the pacing delay of the ventricle is decreased to be less than or equal to the measured intrinsic interval. Capture of the ventricle is verified after pacing is delivered during the subsequent cardiac cycle.
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Citations
30 Claims
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1. A cardiac therapy system capable of delivering cardiac resynchronization therapy (CRT) that includes pacing at least the left ventricle, the system comprising:
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electrodes configured to electrically couple to right and left ventricles; sensing circuitry configured to sense cardiac signals via the electrodes, the cardiac signals including intrinsic depolarization signals; pacing circuitry configured to generate pacing pulses deliverable through the electrodes; cardiac response classification circuitry configured to determine cardiac responses to the pacing pulses; and pacing control circuitry configured to control the pacing circuitry, the pacing control circuitry configured to schedule delivery of CRT pacing to at least one ventricle relative to a pacing delay for the ventricle during a cardiac cycle, and, if an intrinsic depolarization is detected during the pacing delay, to inhibit the scheduled CRT pacing to the ventricle, to measure an intrinsic interval of the ventricle, which is concluded by the intrinsic depolarization, and to decrease a subsequent pacing delay of the ventricle for a subsequent cardiac cycle to be less than or equal to the measured intrinsic interval, wherein to measure the intrinsic interval and to decrease the subsequent pacing delay are performed on a beat by beat basis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification