Patent ID: 8417344

Claim:
An implantable medical device (IMD) to treat a medical condition in a patient, the implantable medical device comprising: a cardiac data sensing module operable to sense cardiac data of a patient; a value setting module operable to set at least one first threshold value; a cardiac module operable to determine at least one first cardiac parameter based upon sensed cardiac data from the cardiac data sensing module; an unstable brain state declaration module that declaresan unstable brain state of the patient in response to the at least one first cardiac parameter satisfying the at least one first threshold value; and an electrical signal generator configured to be operatively coupled to a vagus nerve of the patient; wherein the electrical signal generator is configured to apply a first electrical signal configured to treat a chronic medical condition when the unstable brain state has not been declared, and wherein the electrical signal generator is configured to apply a second electrical signal configured to treat an acute medical condition when the unstable brains state has been declared.