Cardiac pacemaker with pacing rate monitoring
First Claim
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1. A cardiac rhythm management device, comprising:
- pacing circuitry to deliver pacing pulses;
control circuitry to schedule paces to be delivered by the pacing circuitry in accordance with a programmed pacing mode;
interval detection circuitry to measure the interval between the times of a scheduled pace and a preceding delivered pace, the reciprocal of the interval being the pacing rate;
counting circuitry to count the number of pacing pulses delivered over a specified time period and derive a pace count therefrom;
monitoring circuitry to monitor the pacing rate and the pace count, wherein the monitoring circuitry is capable of operating in either a normal-rate zone or a high-rate zone;
wherein, when operating in the normal-rate zone, the monitoring circuitry is configured to set an error flag if the pacing rate exceeds a specified normal-rate limit value; and
, wherein, when operating in the high-rate zone, the monitoring circuitry is configured to set an error flag if either the pacing rate exceeds a specified high-rate limit value or if the pace count over the specified period of time exceeds a specified count limit value.
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Abstract
A pacing monitoring system is described for incorporation in an implantable pacemaker that monitors the pacing rate and/or cumulative pace count in order to protect a patient from excessive pacing. The system includes monitoring circuitry that is configured to operate in multiple monitoring zones, where each zone is adapted to prevent excessively high-rate pacing during a particular mode of device operation.
52 Citations
15 Claims
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1. A cardiac rhythm management device, comprising:
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pacing circuitry to deliver pacing pulses; control circuitry to schedule paces to be delivered by the pacing circuitry in accordance with a programmed pacing mode; interval detection circuitry to measure the interval between the times of a scheduled pace and a preceding delivered pace, the reciprocal of the interval being the pacing rate; counting circuitry to count the number of pacing pulses delivered over a specified time period and derive a pace count therefrom; monitoring circuitry to monitor the pacing rate and the pace count, wherein the monitoring circuitry is capable of operating in either a normal-rate zone or a high-rate zone; wherein, when operating in the normal-rate zone, the monitoring circuitry is configured to set an error flag if the pacing rate exceeds a specified normal-rate limit value; and
, wherein, when operating in the high-rate zone, the monitoring circuitry is configured to set an error flag if either the pacing rate exceeds a specified high-rate limit value or if the pace count over the specified period of time exceeds a specified count limit value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification