Extraction of cardiac signal data
First Claim
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1. An apparatus comprising:
- a circuit-based computer configured and arranged with executable instructions toidentify a T-wave offset point within a first time window of an ECG signal, andprovide the identified T-wave offset point as an output based upon a noise characteristic of the ECG signal in a second time window that includes at least a portion of the T-wave of the ECG signal.
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Abstract
A T-wave offset point of an ECG signal is provided. In accordance with various example embodiments, a location of a QRS complex in the ECG signal is identified and used to determine a first time window of the ECG signal in which to search for a T-wave offset point. The T-wave offset point is identified within the first time window, and the identified T-wave offset point is provided as an output based upon a noise characteristic of the ECG signal in a second time window that includes at least a portion of the T-wave.
49 Citations
36 Claims
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1. An apparatus comprising:
a circuit-based computer configured and arranged with executable instructions to identify a T-wave offset point within a first time window of an ECG signal, and provide the identified T-wave offset point as an output based upon a noise characteristic of the ECG signal in a second time window that includes at least a portion of the T-wave of the ECG signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for providing a repolarization signal for a cardiac cycle of an ECG signal, the apparatus comprising:
a circuit-based computer configured and arranged with executable instructions to identify the location of a QRS complex in the cardiac cycle; identify T-wave onset and offset points based on the identified location of the QRS complex; define the start and end of the repolarization signal for the cardiac cycle, based respectively upon the T-wave onset and offset points; determine a noise characteristic of the ECG signal in a time window spanning from about the start to about the end of the repolarization signal, and providing the repolarization signal as an output, based upon the determined noise characteristic. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for providing a time series of beat-to-beat QT interval values from a digitized ECG signal of an ambulatory subject, the apparatus comprising:
a circuit-based computer configured and arranged with executable instructions to identify the location of a QRS complex and a Q-wave onset point of a cardiac cycle of the ECG signal; determine a first time window of the cardiac cycle in which to search for a T-wave offset point for a T-wave in the cardiac cycle, based upon one of the identified location of the QRS complex and the identified location of the Q-wave onset point; identify the T-wave offset point within the first time window; compute a QT interval value using the identified Q-wave onset point of the QRS complex and the identified T-wave offset point, and provide the QT interval value in a time series of beat-to-beat QT interval values, based upon a noise characteristic of the digitized ECG signal in a second time window that includes at least a portion of the T-wave. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A computer program product, comprising:
a non-transitory computer readable medium storing executable program instructions, which when executed by a computing apparatus, cause the computing apparatus system to perform a method comprising; identifying a T-wave offset point within a first time window of an ECG signal, and providing the identified T-wave offset point as an output based upon a noise characteristic of the ECG signal in a second time window that includes at least a portion of the T-wave of the ECG signal. - View Dependent Claims (36)
Specification