Methods and Systems for Discriminating Between Ventricular Waveforms When Ventricular Rate Exceeds Atrial Rate
First Claim
1. A method for discriminating between cardiac signal waveforms using an implantable medical device, said method comprising:
- sensing atrial waveforms of a heart and determining an atrial rate based on the atrial waveforms;
sensing ventricular waveforms of the heart and determining a ventricular rate based on first candidate waveforms and second candidate waveforms within the ventricular waveforms;
determining if the ventricular rate exceeds the atrial rate;
if the ventricular rate exceeds the atrial rate, comparing each of the first candidate waveforms of the ventricular waveforms and the second candidate waveforms of the ventricular waveforms to a first predetermined waveform template to obtain a first morphology indicator and a second morphology indicator, wherein the first and second morphology indicators represent a degree to which the respective first and second candidate waveforms match the first predetermined waveform template.
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Accused Products
Abstract
A ventricular rate based on first candidate waveforms and second candidate waveforms within sensed ventricular waveforms is compared to an atrial rate. If the ventricular rate exceeds the atrial rate, the first candidate waveforms and second candidate waveforms are compared to a ventricular polarization complex template to obtain a first morphology indicator and a second morphology indicator. If a morphology match inconsistency is present, the amount by which the ventricular rate exceeds the atrial rate is compared to a threshold. If the threshold is exceeded, high-ventricular-rate therapy to the heart is inhibited. The ventricular polarization complex template may be a QRS-complex template, in which case a match inconsistency is present if each of the first candidate waveforms and the second candidate waveforms do not match the QRS-complex template. Alternatively, the ventricular polarization complex template may be a T-wave template, in which case a match inconsistency is present if either of the first candidate waveforms and the second candidate waveforms matches the T-wave template.
16 Citations
20 Claims
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1. A method for discriminating between cardiac signal waveforms using an implantable medical device, said method comprising:
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sensing atrial waveforms of a heart and determining an atrial rate based on the atrial waveforms; sensing ventricular waveforms of the heart and determining a ventricular rate based on first candidate waveforms and second candidate waveforms within the ventricular waveforms; determining if the ventricular rate exceeds the atrial rate; if the ventricular rate exceeds the atrial rate, comparing each of the first candidate waveforms of the ventricular waveforms and the second candidate waveforms of the ventricular waveforms to a first predetermined waveform template to obtain a first morphology indicator and a second morphology indicator, wherein the first and second morphology indicators represent a degree to which the respective first and second candidate waveforms match the first predetermined waveform template. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implantable medical device for discriminating between cardiac signal waveforms, said device comprising:
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electrodes adapted to be positioned proximate to a heart for sensing atrial waveforms of a heart and ventricular waveforms of the heart having first candidate waveforms and second candidate waveforms; and a microcontroller configured to; determine an atrial rate based on the atrial waveforms, determine a ventricular rate based on the first candidate waveforms and the second candidate waveforms within the ventricular waveforms, and determine of the ventricular rate exceeds the atrial rate; if the ventricular rate exceeds the atrial rate, compare each of the first candidate waveforms of the ventricular waveforms and the second candidate waveforms of the ventricular waveforms to a first predetermined waveform template to obtain a first morphology indicator and a second morphology indicator, wherein the first and second morphology indicators represent a degree to which the respective first and second candidate waveforms match the first predetermined waveform template. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for discriminating between ventricular waveforms when a ventricular rate exceeds an atrial rate, wherein the ventricular rate is based on first candidate waveforms and second candidate waveforms within the ventricular waveforms, said method comprising:
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comparing the first candidate waveforms of the ventricular waveforms and the second candidate waveforms of the ventricular waveforms to a ventricular polarization complex template to obtain a first morphology indicator and a second morphology indicator, wherein the first and second morphology indicators represent a degree to which the respective first and second candidate waveforms match the ventricular polarization complex template; if a match inconsistency is present, comparing the ventricular rate and the atrial to determine if the ventricular rate exceeds the atrial rate by a threshold amount; and inhibiting therapy to the heart if the ventricular rate exceeds the atrial rate by the threshold amount. - View Dependent Claims (17, 18, 19, 20)
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Specification