Evaluating ventricular synchrony based on phase angle between sensor signals
First Claim
1. A method comprising:
- receiving signals that reflect contractions of at least one ventricle of a heart, each of the signals received from a respective sensor implanted within a patient;
processing the signals to determine a phase angle between the signals; and
adjusting at least one interval for ventricular pacing based on the phase angle.
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Accused Products
Abstract
An implantable medical device evaluates ventricular synchrony by determining a phase angle between at least two sensor signals that reflect mechanical contraction of the ventricles. In exemplary embodiments, two intracardiac impedance signals associated with the right and left ventricles, respectively, with two points within either of the left and right ventricles, or with both the left and right ventricles relative to a reference point, are processed. In such embodiments, fundamental frequency phases of each of the impedance signals may be compared to determine the phase angle between the signals. In some embodiments, the signals are used to dynamically adjust one or more timing intervals, such as a V-V timing interval, for delivery of cardiac resynchronization therapy (CRT) pacing. In such embodiments, the one or more timing intervals are periodically adjusted to reduce or possibly eliminate ventricular dysynchrony as indicated by the phase angle between the sensor signals.
93 Citations
48 Claims
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1. A method comprising:
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receiving signals that reflect contractions of at least one ventricle of a heart, each of the signals received from a respective sensor implanted within a patient;
processing the signals to determine a phase angle between the signals; and
adjusting at least one interval for ventricular pacing based on the phase angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A medical device comprising:
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sensors implanted within a patient to generate respective signals that reflect contractions of at least one ventricle of a heart of the patient; and
a processor to determine a phase angle between the signals, and adjust at least one interval for ventricular pacing based on the phase angle. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A computer-readable medium comprising instructions that cause a programmable processor to:
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determine a phase angle between signals that reflect contractions of at least one ventricle of a heart of a patient, each of the signals generated by at least one sensor implanted within the patient; and
adjust at least one interval for ventricular pacing based on the phase angle. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A medical device comprising:
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means for generating signals that reflect contractions of at least one ventricle of a heart; and
means for determining a phase angle between the signals, and adjusting at least one interval for ventricular pacing based on the phase angle. - View Dependent Claims (43, 44, 45, 46, 47, 48)
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Specification