Patent ID: 8774908
Filing Date: 2014-07-08
Classification: A61B

Abstract:
1. A system for calculating a variability value that is indicative of AF using a sequence of RR intervals, wherein said system comprises a non-volatile computer readable medium storing a plurality of programmatic instructions and wherein said programmatic instructions, when executed: obtain a signal sequence comprising a plurality of RR intervals wherein said signal sequence is obtained by monitoring the time intervals between successive heart beats of a patient's heart by measuring at least one of electrical activity; acoustic activity; trans-thoracic impedance; blood pressure; blood velocity; blood oxygenation; heart movement and/or deformation; convert each RR interval in said sequence into an instantaneous heart rate value; sort said instantaneous heart rate values into ascending order; calculate differences between each of said sorted successive instantaneous heart rates; discard two largest differences generated in the previous step; and calculate a variability value by adding differences which were not discarded.