Epileptic event detection based on correlation of body signals

A medical device system, comprising:

• at least one first sensor configured to collect a time series of a body signal from a patient;
• at least one second sensor configured to sense a work level signal relating to said patient's work level;
• and
• a medical device, comprising:
• a body signal reference value module configured to provide at least a first body signal reference value;
• a current body signal module configured to determine a current body signal value from said time series;
• a comparison module configured to compare said current body signal value and said at least a first body signal reference value;
• a work level module configured to determine a work level of said patient, based at least in part on said work level signal;
• an ictal component module configured to determine whether said current body signal value comprises an ictal component, based on an output of said work level module and an output of said comparison module;
• an epileptic seizure detection module configured to issue a detection of an epileptic seizure, based on an output of said ictal component module indicative of said current body signal value comprising said ictal component;
• and
• at least one responsive unit for performing a responsive action based on the epileptic seizure detection module issuing a detection, wherein said responsive unit is selected from
• a warning unit configured to issue a warning signal of said epileptic seizure,
• a therapy unit configured to deliver a therapy for said epileptic seizure,
• a seizure severity unit configured to quantify a severity of said epileptic seizure, or
• a memory configured to log one or more of
• the date and time of occurrence of said epileptic seizure,
• a severity of the epileptic seizure,
• a type of therapy delivered, or
• at least one effect of a therapy delivered to treat the epileptic seizure.

A method for detecting an epileptic event in a patient's body, comprising:

• receiving a first body signal during a first time period;
• receiving a second body signal during said first time period;
• determining whether there is a change in said first body signal during said first time period;
• determining whether there is a change in said second body signal during said first time period that correlates to said change in the first body signal, in response to determining that there is a change in said first body signal during said first time period;
• detecting an epileptic event in response to determining that there is not a change in said second body signal that correlates to said change in the first body signal;
• and
• performing a responsive action in response to detecting an epileptic event, said responsive action comprising at least one of delivering a therapy, providing a warning, or logging data relating to said epileptic event.