Method and apparatus for detecting and discriminating tachycardia
First Claim
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1. A method, comprising:
- obtaining a plurality of cardiac event intervals, at least a portion of the plurality of intervals corresponding to a tachycardia interval;
sensing a first cardiac event having a morphology corresponding to a supraventricular beat;
obtaining evidence of a rhythm breaking point preceding the first cardiac event; and
detecting a non-treatable rhythm in response to the plurality of cardiac event intervals and the evidence of the rhythm breaking point, wherein obtaining evidence of a rhythm breaking point comprises;
sensing a preceding cardiac event, the preceding cardiac event and the first cardiac event being consecutive cardiac events;
measuring an interval between the first cardiac event and the preceding cardiac event;
generating an event interval threshold;
comparing the measured interval to the event interval threshold; and
detecting a long pause in response to the interval being longer than the event interval threshold, the method further comprising;
obtaining evidence of an undersensed cardiac event in response to detecting the long pause; and
cancelling the long pause detection in response to obtaining the evidence of an undersensed cardiac event.
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Abstract
A medical device and associated method obtaining cardiac event intervals corresponding to a tachycardia interval. Evidence of a rhythm breaking point is obtained in response to sensing a cardiac event having a morphology corresponding to a supraventricular beat. A non-treatable rhythm is detected in response to the plurality of cardiac event intervals and the evidence of the rhythm breaking point.
87 Citations
18 Claims
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1. A method, comprising:
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obtaining a plurality of cardiac event intervals, at least a portion of the plurality of intervals corresponding to a tachycardia interval; sensing a first cardiac event having a morphology corresponding to a supraventricular beat; obtaining evidence of a rhythm breaking point preceding the first cardiac event; and detecting a non-treatable rhythm in response to the plurality of cardiac event intervals and the evidence of the rhythm breaking point, wherein obtaining evidence of a rhythm breaking point comprises; sensing a preceding cardiac event, the preceding cardiac event and the first cardiac event being consecutive cardiac events; measuring an interval between the first cardiac event and the preceding cardiac event; generating an event interval threshold; comparing the measured interval to the event interval threshold; and detecting a long pause in response to the interval being longer than the event interval threshold, the method further comprising; obtaining evidence of an undersensed cardiac event in response to detecting the long pause; and cancelling the long pause detection in response to obtaining the evidence of an undersensed cardiac event. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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obtaining a plurality of cardiac event intervals, at least a portion of the plurality of intervals corresponding to a tachycardia interval; sensing a first cardiac event having a morphology corresponding to a supraventricular beat; obtaining evidence of a rhythm breaking point preceding the first cardiac event; and detecting a non-treatable rhythm in response to the plurality of cardiac event intervals and the evidence of the rhythm breaking point, wherein obtaining evidence of a rhythm breaking point comprises; sensing a preceding cardiac event, the preceding cardiac event and the first cardiac event being consecutive cardiac events; measuring an interval between the first cardiac event and the preceding cardiac event; generating an event interval threshold; comparing the measured interval to the event interval threshold; and detecting a long pause in response to the interval being longer than the event interval threshold, the method further comprising storing a normal morphology template, wherein determining whether the morphology of the preceding cardiac event corresponds to a supraventricular heartbeat comprises computing a morphology matching score by comparing the morphology of the preceding cardiac event starting the long pause to the stored template. - View Dependent Claims (8, 9)
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10. A medical device for monitoring a patient'"'"'s heart rhythm, comprising:
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a first detector to sense a plurality of cardiac events intervals, at least a portion of the plurality of intervals corresponding to a tachycardia interval; a second detector to sense a first cardiac event having a morphology corresponding to a supraventricular beat and to obtaining evidence of a rhythm breaking point preceding the first cardiac event; and a processor configured to detect a non-treatable rhythm in response to the plurality of cardiac event intervals and the evidence of a rhythm breaking point, wherein obtaining the evidence of a rhythm breaking point comprises; sensing a preceding cardiac event, the preceding cardiac event and the first cardiac event being consecutive cardiac events; measuring an interval between the first cardiac event and the preceding cardiac event; generating an event interval threshold; comparing the measured interval to the event interval threshold; and detecting a long pause in response to the interval being longer than the event interval threshold, and wherein the second detector obtains evidence of an undersensed cardiac event in response to detecting the long pause, and cancels the long pause detection in response to obtaining the evidence of an undersensed cardiac event. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification