System and method of automatically determining the onsets and ends of cardiac events and far-field signals
AssigneePacesetter, Inc.
InventorsKelly H. McClure, Gene A. Bornzin, Junyu Mai
Life of this patent
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Abstract
A system and method for determining the onset and termination of cardiac events, such as the R-wave, the T-wave and the far-field signals sensed in the atria associated with the R-wave (FFR) and T-wave (FFT). The onset is defined as the time of the first sampled point of the cardiac signal whose magnitude exceeds a pre-defined threshold for the particular event. Once the onset of an event is positively determined, the cardiac signal is sampled at given intervals. The change in magnitude of these sampled points is determined. The termination of the event is identified through an algorithm that compares the difference in magnitude of these sampled points.
Claims14
A device for automatically determining an onset and an end of a cardiac event, the device comprising:
- a data acquisition system that samples a cardiac signal to generate samples;
- a sense circuit, coupled to the data acquisition system, to measure the amplitudes of the samples;
- a controller, connected to the data acquisition system to receive the samples and being operative to determine the onset of the cardiac event to a time at which a magnitude of a sample exceeds a predefined onset threshold value, and to determine the end of the cardiac event based on detection of a change in amplitude of consecutive samples that is below a predefined termination threshold value.
A device for automatically determining an onset and an end of a cardiac event, the device comprising:
- means for sampling the cardiac signal to generate samples therefrom;
- means for measuring the amplitudes of the samples;
- and
- means for determining the onset of the cardiac event as a time at which a magnitude of a first sensed sample exceeds a predefined onset threshold value for the cardiac signal, and for determining the end of the cardiac event as a sensed sample after which the change in amplitude of consecutive samples is below a predefined termination threshold value.
Dependencies are inferred from the claim text.