Patent ID: 8108038

Claim:
A medical device system comprising: (a) a brain monitoring element for sensing activity of the brain and outputting a brain signal; (b) a cardiac monitoring element for sensing activity of the heart and outputting a cardiac signal; and (c) one or more processors in communication with the brain monitoring element and the cardiac monitoring element, the one or more processors configured to: (i) receive the brain signal; (ii) determine at least one reference point for a brain event time period by evaluation of the brain signal; (iii) receive the cardiac signal; (iv) identify a first portion of the cardiac signal based on the at least one reference point of the brain event time period; (v) identify a second portion of the cardiac signal based on the at least one reference point; (vi) determine a first metric of the first portion of the cardiac signal; (vii) determine a second metric of the second portion of the cardiac signal; (viii) determine a second metric time related to the amount of time from the at least one reference point to the occurrence of the second portion; (ix) determine whether the second metric meets a predetermined criteria about its relationship to the first metric; and (x) record in memory the second metric time when the second metric meets the predetermined criteria.