Heart attack or ischemia detector

A system comprising:

• an implantable trigger event detector, adapted to detect at least one first condition and to output a responsive trigger signal including information about whether the first condition has been detected, wherein the at least one first condition is indicative of at least a reduction in a patient's vagal response;
• an implantable patient activity sensor and a timer circuit coupled to the trigger event detector;
• and
• an implantable ischemia detector, adapted to detect a second condition indicative of one or more physiologic cardiovascular events in a subject that are indicative of ischemia, wherein the ischemia detector is coupled to the trigger event detector to receive the trigger signal, and wherein the ischemia detector is enabled upon the trigger signal indicating a decrease in patient activity level within a predetermined period of time.

A system comprising:

• an implantable trigger event detector, adapted to detect at least one first condition and to output a responsive trigger signal including information about whether the first condition has been detected, wherein the at least one first condition is indicative of at least a reduction in a patient's vagal response;
• a timer circuit coupled to the trigger event detector;
• and
• an implantable ischemia detector, adapted to detect a second condition indicative of one or more physiologic cardiovascular events in a subject that are indicative of ischemia, wherein the ischemia detector is coupled to the trigger event detector to receive the trigger signal, and wherein the ischemia detector is enabled by the trigger event detector using a circadian rhythm when detecting the first condition.

A method comprising:

• sensing one or more sensor signals produced by one or more implantable sensors, each sensor signal including physiologic cardiovascular information;
• determining at least one first condition that is indicative of at least a reduction in a patient's vagal response;
• and
• enabling detection of a second condition related to one or more physiologic cardiovascular events in a subject that are indicative of myocardial ischemia upon detecting the first condition, wherein determining the first condition includes detecting at least one physiologic event from the group consisting of:
• a) a decrease in heart rate variability (HRV);
• b) a decrease in respiratory sinus arrhythmia (RSA);
• c) a predetermined decrease in patient activity level within a predetermined period of time;
• and
• d) a time that is predetermined according to a patient circadian rhythm.

A method comprising:

• sensing one or more sensor signals produced by one or more implantable sensors, each sensor signal including physiologic cardiovascular information;
• determining at least one first condition that is indicative of at least a reduction in a patient's vagal response, wherein determining the first condition includes determining a circadian rhythm of the subject;
• and
• enabling detection of a second condition related to one or more physiologic cardiovascular events in a subject that are indicative of myocardial ischemia upon detecting the first condition.