Method and device for sensing atrial depolarizations during ventricular tachycardia
AssigneeCardiac Pacemakers, Inc.
InventorJaeho Kim
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Abstract
A cardiac rhythm management device is disclosed which incorporates an improved method for sensing atrial depolarizations during episodes of ventricular tachycardia. The atrial sensing channel is blanked for a specified blanking interval after detection of a ventricular sense. When the ventricular rate is above a specified limit rate, the blanking interval for the atrial sensing channel is either shortened or blanking is discontinued altogether in order to allow sensing of atrial depolarizations that occur shortly after a ventricular sense.
Claims20
A cardiac rhythm management device, comprising:
- an atrial sensing channel for sensing atrial depolarizations;
- a ventricular sensing channel for sensing ventricular depolarizations;
- a controller for interpreting sensed signals generated by the sensing channels and detecting atrial or ventricular senses when the sensed signals exceed respective atrial and ventricular sensing threshold values;
- wherein the controller is configured to measure atrial and ventricular rates;
- wherein the controller is programmed to blank the atrial sensing channel after detection of a ventricular sense for a specified blanking interval;
- and,
- wherein the controller is configured to shorten the specified blanking interval when a ventricular rate above a specified limit rate is detected.
A method for operating a cardiac rhythm management device, comprising:
- sensing atrial depolarizations through an atrial sensing channel;
- sensing ventricular depolarizations through a ventricular sensing channel;
- interpreting sensed signals generated by the sensing channels and detecting atrial or ventricular senses when the sensed signals exceed respective atrial and ventricular sensing threshold values;
- measuring atrial and ventricular rates;
- blanking the atrial sensing channel after detection of a ventricular sense for a specified blanking interval;
- and,
- shortening the blanking interval for the atrial sensing channel when a ventricular rate above a specified limit rate is detected.
Dependencies are inferred from the claim text.