Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term “disorders of consciousness” refers to medical conditions that inhibit consciousness of an individual. Conditions which are characterized by a disturbed state of awareness include locked-in syndrome, minimally conscious state as well as persistent vegetative state, chronic coma and brain death. In medicine, the patient’s level of consciousness is regarded as one of the principal vital signs. Learn more about disorders of consciousness, their causes, symptoms and treatment in this book.