System and method for detecting atrial events of a heart
First Claim
1. A system for detecting atrial events of a heart comprising:
- A wave detecting means for detecting A waves of the heart and providing an A wave detection signal indicating each detected A wave, the A wave detecting means including a first threshold and means for providing the A wave detection signal when an A wave is detected with the first threshold and a second threshold higher than the first threshold and means for providing the A wave detection signal when an A wave is detected with the second threshold; and
an R wave detector for detecting R waves of the heart and coupled to the A wave detecting means for activating the second threshold of the A wave detecting means during each detected R wave of the heart.
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Abstract
A continuous monitoring system monitors atrial activity of a heart and activates an atrial fibrillation detector when atrial fibrillation is suspected. The system includes an A wave detector for detecting A waves of the heart and providing an A wave detection signal indicating each detected A wave. The A wave detector has a first threshold and a selectable second threshold higher than the first threshold. An R wave detector for detecting R waves of the heart is coupled to the A wave detector for selecting the second threshold of the A wave detector during each detected R wave of the heart. An atrial cycle length determining stage determines atrial cycle lengths from the A wave detection signal and a comparator activates atrial fibrillation detection when an atrial cycle length is shorter than a predetermined cycle length.
124 Citations
9 Claims
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1. A system for detecting atrial events of a heart comprising:
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A wave detecting means for detecting A waves of the heart and providing an A wave detection signal indicating each detected A wave, the A wave detecting means including a first threshold and means for providing the A wave detection signal when an A wave is detected with the first threshold and a second threshold higher than the first threshold and means for providing the A wave detection signal when an A wave is detected with the second threshold; and an R wave detector for detecting R waves of the heart and coupled to the A wave detecting means for activating the second threshold of the A wave detecting means during each detected R wave of the heart. - View Dependent Claims (2, 3)
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4. A system for detecting atrial events of a heart comprising:
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a first sense amplifier for sensing atrial activity of a heart; a second sense amplifier for sensing ventricular activity of the heart; A wave detecting means coupled to the first sense amplifier for providing an output signal indicating each detected A wave, said A wave detecting means having a first threshold and means for providing the output signal when an A wave is detected with the first threshold and a second threshold higher than the first threshold and means for providing the output signal when an A wave is detected with the second threshold; an R wave detector coupled to the second sense amplifier for detecting R waves from the sensed ventricular activity; delay means for causing a delay in the output signal; and switch means coupled to the R wave detector for switching the A wave detecting means from the first threshold to the second threshold during each detected R wave.
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5. A continuous monitoring system for monitoring atrial activity of a heart and activating atrial fibrillation detection when atrial fibrillation is suspected, the system comprising:
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A wave detecting means for detecting A waves of the heart and providing an A wave detection signal indicating each detected A wave, the A wave detecting means including a first threshold and means for providing the A wave detection signal when an A wave is detected with the first threshold and a second threshold higher than the first threshold and means for providing the A wave detection signal when an A wave is detected with the second threshold; an R wave detector for detecting R waves of the heart and coupled to the A wave detecting means for activating the second threshold of the A wave detecting means during each detected R wave of the heart; means for determining an atrial cycle length from the A wave detection signal; and activation means for activating atrial fibrillation detection responsive to the atrial cycle lengths. - View Dependent Claims (6, 7, 8)
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9. A method of detecting atrial events of a heart, the method including the steps of:
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sensing atrial activity of the heart; sensing ventricular activity of the heart; detecting R waves from the sensed ventricular activity; and detecting A waves from the sensed atrial activity with a first threshold and detecting A waves from the sensed atrial activity with a second threshold higher than the first threshold during detected R waves.
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Specification