Patent ID: 9420958
Filing Date: 2016-08-23
CPC Classification: A61B

Claim Text:
1. A computer-implemented method for determining changes in a body state of an individual, comprising: receiving a signal from a monitoring system, said signal indicating a measurement of cardiac activity over a period of time; determining at least one signal feature and a value representative of the signal feature, wherein the signal feature is a reoccurring event of the signal over the period of time; calculating a first interval as a difference between a value representative of a first signal feature and a value representative of a second signal feature, wherein the first signal feature and the second signal feature are successive in the signal between two successive signal features; calculating a second interval as a difference between a value representative of a third signal feature and a value representative of a fourth signal feature, wherein the third signal feature and the fourth signal feature are successive in the signal; calculating a difference between the first interval and the second interval between two successive first intervals; calculating a derivative based on the difference between the first interval and the second interval; and identifying changes in the body state based on the derivative.