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Harnessing S1 variability for AF detection

  • US 10,194,819 B2
  • Filed: 01/17/2017
  • Issued: 02/05/2019
  • Est. Priority Date: 01/22/2016
  • Status: Active Grant
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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