Method for collection of biventricular histograms
First Claim
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1. A method for operating a cardiac pacemaker in resynchronization pacing mode, comprising:
- sensing rate and synchronized heart chambers through separate channels and generating sense signals upon detection of depolarization occurring in a chamber;
pacing the rate chamber in accordance with bradycardia pacing mode based upon rate chamber senses and paces;
pacing the synchronized chamber in accordance with a resynchronization pacing mode;
measuring a rate chamber event interval for each cardiac cycle, wherein the interval is the time between rate chamber senses and paces that define a cardiac cycle;
counting the number of senses and paces occurring in each rate and synchronized chamber for a specified period of time and assigning each counted sense or pace to an interval bin representing the rate chamber event interval for that cardiac cycle so that each interval bin contains a sense count and a pace count for each chamber;
calculating an event frequency for the senses and paces in each interval bin over the specified period of time by dividing the sense and pace count in each bin by a denominator equal to the sum of the total sense counts for the rate chamber, the total pace counts for the rate chamber, and the total pace counts for the synchronized chamber only for those cardiac cycles in which no pace was delivered to the rate chamber.
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Abstract
A method for operating a cardiac pacemaker in which paces and senses are counted during each cardiac cycle and associated with an R-R interval or other interval defining a cardiac cycle. An event frequency for each sense and pace is calculated which can be displayed as a histogram. The method is particularly suited for calculating such frequencies in resynchronization pacing modes.
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Citations
16 Claims
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1. A method for operating a cardiac pacemaker in resynchronization pacing mode, comprising:
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sensing rate and synchronized heart chambers through separate channels and generating sense signals upon detection of depolarization occurring in a chamber;
pacing the rate chamber in accordance with bradycardia pacing mode based upon rate chamber senses and paces;
pacing the synchronized chamber in accordance with a resynchronization pacing mode;
measuring a rate chamber event interval for each cardiac cycle, wherein the interval is the time between rate chamber senses and paces that define a cardiac cycle;
counting the number of senses and paces occurring in each rate and synchronized chamber for a specified period of time and assigning each counted sense or pace to an interval bin representing the rate chamber event interval for that cardiac cycle so that each interval bin contains a sense count and a pace count for each chamber;
calculating an event frequency for the senses and paces in each interval bin over the specified period of time by dividing the sense and pace count in each bin by a denominator equal to the sum of the total sense counts for the rate chamber, the total pace counts for the rate chamber, and the total pace counts for the synchronized chamber only for those cardiac cycles in which no pace was delivered to the rate chamber. - View Dependent Claims (2, 3, 4, 5)
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6. A cardiac rhythm management device, comprising:
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sensing channels for sensing depolarizations in a pair of heart chambers and generating sense signals in accordance therewith;
right and left pacing channels for delivering paces to the right and left chambers, wherein one chamber is designated as the synchronized chamber and the other chamber as the rate chamber;
a controller for controlling the delivery of paces to the rate chamber in accordance with a bradycardia pacing mode and to pace the synchronized chamber in accordance with a resynchronization pacing mode;
wherein the controller is programmed to measure a rate chamber event interval for each cardiac cycle, wherein the interval is the time between rate chamber senses and paces that define a cardiac cycle, and to count the number of senses and paces occurring in each rate and synchronized chamber for a specified period of time and assign each counted sense or pace to an interval bin representing the rate chamber event interval for that cardiac cycle so that each interval bin contains a sense count and a pace count for each chamber; and
,wherein the controller is programmed to calculate an event frequency for the senses and paces in each interval bin over the specified period of time by dividing the sense and pace count in each bin by a denominator equal to the sum of the total sense counts for the rate chamber, the total pace counts for the rate chamber, and the total pace counts for the synchronized chamber only for those cardiac cycles in which no pace was delivered to the rate chamber. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A cardiac rhythm management system, comprising:
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an external programmer;
a pacemaker having sensing channels for sensing depolarizations in a pair of heart chambers and generating sense signals in accordance therewith, right and left pacing channels for delivering paces to the right and left chambers, wherein one chamber is designated as the synchronized chamber and the other chamber as the rate chamber, a controller for controlling the delivery of paces to the rate chamber in accordance with a bradycardia pacing mode and to pace the synchronized chamber in accordance with a resynchronization pacing mode, and a telemetry interface for transmitting data to the external programmer;
wherein the pacemaker controller is programmed to measure a rate chamber event interval for each cardiac cycle, wherein the interval is the time between rate chamber senses and paces that define a cardiac cycle, and to count the number of senses and paces occurring in each rate and synchronized chamber for a specified period of time and assign each counted sense or pace to an interval bin representing the rate chamber event interval for that cardiac cycle so that each interval bin contains a sense count and a pace count for each chamber;
wherein the controller is programmed to transmit the counts in each interval bin to an external programmer; and
,wherein the external programmer is configured to calculate an event frequency for the senses and paces in each interval bin over the specified period of time by dividing the sense and pace count in each bin by a denominator equal to the sum of the total sense counts for the rate chamber, the total pace counts for the rate chamber, and the total pace counts for the synchronized chamber only for those cardiac cycles in which no pace was delivered to the rate chamber. - View Dependent Claims (13, 14, 15, 16)
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Specification