System and Method for Determining Intrinsic AV Interval Timing
First Claim
1. A method of collecting data for intrinsic ventricular conduction times as a function of atrial rate for an implantable medical device, the method comprising:
- pacing at an atrial test rate;
sensing to determine if ventricular conduction occurs;
measuring the AV delay if conduction occurred;
recording the AV delay as corresponding to the test rate in a memory of the implantable medical device; and
increasing the test rate by a predetermined increment and repeating the steps of sensing measuring and recording.
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Accused Products
Abstract
An atrial based pacing protocol promotes intrinsic conduction. An entire cardiac cycle is monitored for ventricular activity and permitted to lapse with ventricular activity. Ventricular pacing is available in a cardiac cycle immediately subsequent to such a skipped beat. When monitoring for intrinsic ventricular events, an event is expected within a given window. If no such event is detected, the cardiac cycle in truncated, leading to a shorter cycle that is devoid of ventricular activity. The subsequent cycle has a high likelihood of a ventricular sensed event and a greater than normal AV interval is provided prior to pacing.
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Citations
19 Claims
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1. A method of collecting data for intrinsic ventricular conduction times as a function of atrial rate for an implantable medical device, the method comprising:
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pacing at an atrial test rate; sensing to determine if ventricular conduction occurs; measuring the AV delay if conduction occurred; recording the AV delay as corresponding to the test rate in a memory of the implantable medical device; and increasing the test rate by a predetermined increment and repeating the steps of sensing measuring and recording. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An implantable medical device comprising:
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means for conducting an AV interval test to determine AV delays for intrinsic ventricular conduction at a plurality of atrial rates; means for storing results of the AV interval test in a memory of the IMD; means for operating an implantable medical device (IMD) according to a ventricular pacing protocol (VPP) wherein ventricular pacing is precluded in a given cardiac cycle wherein a ventricular event occurred in a cardiac cycle immediately subsequent to the given cardiac cycle; means for establishing an A-A interval; means for initiating a first AV interval timer at the initiation of the given cardiac cycle; means for sensing for ventricular events; means for scheduling an atrial pacing pulse at an accelerated interval prior to the termination of the A-A interval if no ventricular event is sensed within the duration of the AV interval timer and the results stored in memory indicate successful AV conduction at the accelerated interval. - View Dependent Claims (8, 9)
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10. A method comprising:
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pacing at an atrial test rate; sensing to determine if ventricular conduction occurs; measuring the AV delay if conduction occurred; recording the AV delay as corresponding to the test rate in a memory of an implantable medical device (IMD); increasing the test rate by a predetermined increment and repeating the steps of sensing measuring and recording; operating the IMD according to a ventricular pacing protocol (VPP); sensing a premature ventricular contraction (PVC) in a first cardiac cycle; measuring a duration of a first ventricular interval from a ventricular event immediately preceding the PVC to the PVC; calculating a duration of a second ventricular interval to occur from the PVC to a target ventricular sensed event; and modifying atrial timing in the first cardiac cycle to effect the second ventricular interval, wherein the modification to atrial timing is only made if data recorded in the memory indicates successful AV conduction at the modified atrial rate. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification