Harnessing S1 variability for AF detection
First Claim
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1. A system, comprising:
- a heart sound signal input circuit configured to receive heart sound information of a heart over a first interval, the first interval including at least a portion of each of a first number of cardiac cycles,a heart sound variability circuit configured to determine a morphology variation of first heart sound of the heart sound information over the first interval, the morphology variation including a shape of the first heart sound, including an offset between first and second features of the first heart sound in a first cardiac cycle and an offset between the first and second features of the first heart sound in a second cardiac cycle; and
an atrial fibrillation detection circuit configured to calculate an atrial fibrillation metric indicative of an atrial fibrillation episode of the heart for the first interval using the determined morphology variation.
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Abstract
This document discusses, among other things, systems and methods to determine amplitude and morphology variations of a first heart sound over a first number of cardiac cycles, and to calculate an atrial fibrillation metric indicative of an atrial fibrillation episode of the heart using the determined amplitude and morphology variations. The systems and methods can determine a variability score using the determined amplitude and morphology variations, and can calculate the atrial fibrillation metric using the variability score.
9 Citations
20 Claims
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1. A system, comprising:
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a heart sound signal input circuit configured to receive heart sound information of a heart over a first interval, the first interval including at least a portion of each of a first number of cardiac cycles, a heart sound variability circuit configured to determine a morphology variation of first heart sound of the heart sound information over the first interval, the morphology variation including a shape of the first heart sound, including an offset between first and second features of the first heart sound in a first cardiac cycle and an offset between the first and second features of the first heart sound in a second cardiac cycle; and an atrial fibrillation detection circuit configured to calculate an atrial fibrillation metric indicative of an atrial fibrillation episode of the heart for the first interval using the determined morphology variation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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receiving heart sound information of a heart over a first interval, the first interval including at least a portion of each of a first number of cardiac cycles; determining, using a heart sound variability circuit, a morphology variation of a first heart sound of the heart sound information over the first interval using a heart sound variability circuit, the morphology variation including a shape of the first heart sound, including an offset between first and second features of the first heart sound in a first cardiac cycle and an offset between the first and second features of the first heart sound in a second cardiac cycle; and calculating, using an atrial fibrillation detection circuit, an atrial fibrillation metric indicative of an atrial fibrillation episode of the heart for the first interval using the determined morphology variation. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. At least one machine readable medium including instructions that, when executed by at least one processor, configure the at least one processor to:
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receive heart sound information of a heart over a first interval, the first interval including at least a portion of each of a first number of cardiac cycles; determine a morphology variation of the first heart sound of the heart sound information over the first interval, the morphology variation including a shape of the first heart sound, including an offset between first and second features of the first heart sound in an first cardiac cycle and an offset between the first and second features of the first heart sound in a second cardiac cycle using a heart sound variability circuit; and calculate, using an atrial fibrillation detection circuit, an atrial fibrillation metric indicative of an atrial fibrillation episode of the heart for the first interval using the determine morphology variation. - View Dependent Claims (18, 19, 20)
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Specification