Patent ID: 9591986
Date: 2017-03-14
CPC Classifications: A61B,A61N

Claim:
1. A system comprising: a sensing circuit configured to generate a sensed physiological signal representative of cardiac activity of a subject; an arrhythmia detection circuit configured to: monitor ventricular depolarization (V-V) intervals using the sensed physiological signal; monitor a systolic portion of the V-V intervals, wherein a systolic portion of a V-V interval is a sub-interval of the V-V interval associated with cardiac systole; calculate a value of variability of the V-V intervals and calculate a value of variability of the systolic portion of the V-V intervals; and generate an indication of atrial fibrillation (AF) when the calculated values indicate that a change in variability of the V-V intervals is greater than a change in variability of the systolic portion of the V-V intervals, and change a device-based therapy in response to the indication.