Implantable cardiac stimulation system and method for measuring atrioventricular conduction and adjusting atrioventricular hystersis
First Claim
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1. A method for setting an atrioventricular delay in a cardiac stimulation device, the method comprising:
- monitoring for atrial events;
adjusting an atrioventricular delay until an intrinsic ventricular event is detected;
maintaining the adjusted atrioventricular delay for a predetermined number of cardiac cycles; and
storing the adjusted atrioventricular delay if at least a predetermined percentage of ventricular events during the predetermined number of cardiac cycles comprise intrinsic ventricular events.
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Abstract
An implantable cardiac stimulation device and method measure atrioventricular conduction times and automatically adjust an atrioventricular delay time based on the measured conduction time values.
100 Citations
28 Claims
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1. A method for setting an atrioventricular delay in a cardiac stimulation device, the method comprising:
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monitoring for atrial events; adjusting an atrioventricular delay until an intrinsic ventricular event is detected; maintaining the adjusted atrioventricular delay for a predetermined number of cardiac cycles; and storing the adjusted atrioventricular delay if at least a predetermined percentage of ventricular events during the predetermined number of cardiac cycles comprise intrinsic ventricular events. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 26, 27)
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9. A cardiac stimulation device for automatically measuring an atrioventricular conduction time, comprising:
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means for monitoring for atrial events; means for monitoring for intrinsic ventricular events; means for determining atrioventricular conduction times for a plurality of cardiac cycles; means for determining, based on the atrioventricular conduction times, a conduction time value for which at least a predetermined percentage of ventricular events that occur during the plurality of cardiac cycles comprise intrinsic ventricular events; and means for setting an atrioventricular delay to a value based on the conduction time value. - View Dependent Claims (10, 11, 12, 13)
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14. A method of measuring atrioventricular conduction times in an implantable cardiac stimulation device, the method comprising:
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recording a conduction time between each of a plurality of atrial events and corresponding ventricular events; determining a conduction time value by which at least a predetermined percentage of the ventricular events comprise intrinsic ventricular events; and setting an atrioventricular delay to the conduction time value. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A cardiac stimulation device comprising:
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monitoring circuitry that is operative to monitor for atrial events and for corresponding intrinsic ventricular events; processing circuitry that is operative to determine an atrioventricular conduction time for each of a plurality of the monitored atrial events and corresponding monitored intrinsic ventricular events; determining circuitry that is operative to determine a conduction time value by which at least a predetermined percentage of intrinsic ventricular events have occurred; and control circuitry that is operative to set an atrioventricular delay to a value based on the conduction time value. - View Dependent Claims (22, 23, 24, 25)
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28. A method for setting an atrioventricular delay in a cardiac stimulation device, the method comprising:
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monitoring for atrial events; adjusting an atrioventricular delay until an intrinsic ventricular event is detected; maintaining the adjusted atrioventricular delay for a predetermined number of cardiac cycles; and further adjusting the atrioventricular delay if a predetermined percentage of ventricular events during the predetermined number of cardiac cycles comprise paced ventricular events.
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Specification