Method and system for overdriving a heart chamber during a threshold search according to an AV delay
First Claim
1. An implantable medical device comprising:
- a lead including electrodes configured to be positioned within a heart, at least one of the electrodes being capable of sensing cardiac signals;
a pulse generator to deliver a stimulus pulse through at least one of the electrodes;
an autothreshold module to perform a threshold search when operating in an autothreshold mode, the autothreshold module to cause atrial stimulus pulses to be delivered in an atrium of the heart at an overdrive rate during the threshold search; and
a control module to determine an AV conduction time and to apply an overdrive AV adjustment to the AV conduction time to generate an AV delay, the autothreshold module to utilize the AV delay in connection with delivering ventricular stimulus pulses to a ventricle of the heart, wherein the control module measures the AV conduction time between atrial stimulus pulses while the autothreshold module is in the autothreshold mode.
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Abstract
An implantable medical device includes a lead, a pulse generator, an autothreshold module and a control module. The lead includes electrodes positioned within a heart. At least one of the electrodes senses cardiac signals. The pulse generator delivers a stimulus pulse through at least one of the electrodes. The autothreshold module performs a threshold search when operating in an autothreshold mode and causes atrial stimulus pulses to be delivered in an atrium of the heart at an overdrive rate during the threshold search. The control module determines an AV conduction time and applies an overdrive AV adjustment to the AV conduction time to generate an AV delay. The autothreshold module uses the AV delay in connection with delivering ventricular stimulus pulses to a ventricle of the heart.
14 Citations
22 Claims
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1. An implantable medical device comprising:
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a lead including electrodes configured to be positioned within a heart, at least one of the electrodes being capable of sensing cardiac signals; a pulse generator to deliver a stimulus pulse through at least one of the electrodes; an autothreshold module to perform a threshold search when operating in an autothreshold mode, the autothreshold module to cause atrial stimulus pulses to be delivered in an atrium of the heart at an overdrive rate during the threshold search; and a control module to determine an AV conduction time and to apply an overdrive AV adjustment to the AV conduction time to generate an AV delay, the autothreshold module to utilize the AV delay in connection with delivering ventricular stimulus pulses to a ventricle of the heart, wherein the control module measures the AV conduction time between atrial stimulus pulses while the autothreshold module is in the autothreshold mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for overdriving a heart chamber during a threshold search, the method comprising:
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delivering stimulus pulses to an atrium of the heart at an overdrive rate during the threshold search; determining an AV conduction time based on the stimulation pulses; applying an overdrive AV adjustment to the AV conduction time to generate an AV delay; and utilizing the AV delay in connection with delivering a stimulus pulse to a ventricle of the heart, wherein the determining operation comprises measuring the AV conduction time between stimulation pulses. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A non-transitory computer readable storage medium for use with an implantable medical device having a lead including electrodes configured to be positioned within a heart, a pulse generator and a microcontroller, the computer readable storage medium comprising instructions to:
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direct the pulse generator to deliver atrial stimulus pulses in an atrium of the heart at an overdrive rate during a threshold search; and direct the microcontroller to; determine an AV conduction time; and apply an overdrive AV adjustment to the AV conduction time to generate an AV delay, wherein the instructions direct the pulse generator to utilize the AV delay in connection with delivering ventricular stimulus pulses to a ventricle of the heart, wherein the instructions direct the microcontroller to measure the AV conduction time between atrial stimulus pulses during the threshold search. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification