Method and apparatus for atrial arrhythmia episode detection
First Claim
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1. A method of determining a P-wave of a cardiac signal in an implantable medical device, comprising:
- sensing the cardiac signal;
identifying one or more R-waves within the cardiac signal;
determining one or more P-wave sensing windows, wherein each of the P-wave sensing window is associated with one of the one or more identified R-waves;
determining a characteristic P-wave sensing window based on the one or more determined P-wave sensing windows, the characteristic P-wave sensing window having a first portion and a second portion;
determining a first derivative signal of the cardiac signal within the characteristic P-wave sensing window;
determining a second derivative signal of the cardiac signal within the characteristic P-wave sensing window;
analyzing the first derivative and the second derivative of the cardiac signal within the characteristic P-wave window to determine a first set of signal characteristics of the cardiac signal within the first portion of the characteristic P-wave sensing window and a second set of signal characteristics of the cardiac signal within the second portion of the characteristic P-wave sensing window, the signal characteristics including zero crossings of the first derivative signal and amplitudes of the second derivative signal corresponding to the determined zero crossings; and
detecting the P-wave based on the first and the second set of signal characteristics.
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Abstract
A method and medical device for determining a P-wave of a cardiac signal that includes sensing the cardiac signal, determining a P-wave sensing window in response to the sensed cardiac signal, the P-wave sensing window having a first portion and a second portion, determining signal characteristics of the sensed cardiac signal within the first portion and within the second portion, comparing the determined signal characteristics, and determining the P-wave in response to the comparing.
138 Citations
30 Claims
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1. A method of determining a P-wave of a cardiac signal in an implantable medical device, comprising:
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sensing the cardiac signal; identifying one or more R-waves within the cardiac signal; determining one or more P-wave sensing windows, wherein each of the P-wave sensing window is associated with one of the one or more identified R-waves; determining a characteristic P-wave sensing window based on the one or more determined P-wave sensing windows, the characteristic P-wave sensing window having a first portion and a second portion; determining a first derivative signal of the cardiac signal within the characteristic P-wave sensing window; determining a second derivative signal of the cardiac signal within the characteristic P-wave sensing window; analyzing the first derivative and the second derivative of the cardiac signal within the characteristic P-wave window to determine a first set of signal characteristics of the cardiac signal within the first portion of the characteristic P-wave sensing window and a second set of signal characteristics of the cardiac signal within the second portion of the characteristic P-wave sensing window, the signal characteristics including zero crossings of the first derivative signal and amplitudes of the second derivative signal corresponding to the determined zero crossings; and detecting the P-wave based on the first and the second set of signal characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implantable medical device for determining a P-wave in a cardiac signal, comprising:
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a plurality of electrodes configured to sense the cardiac signal; and a processor configured to identify one or more R-waves within the cardiac signal, determine one or more P-wave sensing windows, wherein each of the P-wave sensing windows is associated with one of the one or more identified R-waves, determine a characteristic P-wave sensing window based on the one or more determined P-wave sensing windows, the characteristic P-wave sensing window having a first portion and a second portion, determine a first derivative signal of the cardiac signal within the characteristic P-wave sensing window, determine a second derivative signal of the cardiac signal within the characteristic P-wave sensing window, analyze the first derivative and the second derivative of the cardiac signal within the characteristic P-wave window to determine a first set of signal characteristics of the cardiac signal within the first portion of the characteristic P-wave sensing window and a second set of signal characteristics of the cardiac signal within the second portion of the characteristic P-wave sensing window, the signal characteristics including zero crossings of the first derivative signal and amplitudes of the second derivative signal corresponding to the determined zero crossings, and detect the P-wave based on the first and the second set of signal characteristics. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A non-transitory computer-readable medium storing a set of instructions which cause a processor of an implantable medical device to perform a method of determining a P-wave of a cardiac signal, comprising:
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sensing the cardiac signal; identifying one or more R-waves within the cardiac signal; determining one or more P-wave sensing windows, wherein each of the P-wave sensing window is associated with one of the one or more identified R-waves; determining a characteristic P-wave sensing window based on the one or more determined P-wave sensing windows, the characteristic P-wave sensing window having a first portion and a second portion; determining a first derivative signal of the cardiac signal within the characteristic P-wave sensing window; determining a second derivative signal of the cardiac signal within the characteristic P-wave sensing window; analyzing the first derivative and the second derivative of the cardiac signal within the characteristic P-wave window to determine a first set of signal characteristics of the cardiac signal within the first portion of the characteristic P-wave sensing window and a second set of signal characteristics of the cardiac signal within the second portion of the characteristic P-wave sensing window, the signal characteristics including zero crossings of the first derivative signal and amplitudes of the second derivative signal corresponding to the determined zero crossings; and detecting the P-wave based on the first and the second set of signal characteristics.
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Specification