An increasing number of patients are treated at ICUs worldwide. The majority of these patients survive critical illness and are discharged from the hospital. A stay at the ICU is most often related to life-threatening conditions and displays a major impact on both physical and mental resources of the patients. Studies have shown that a great part of these patients also have physical and psychological impairments lasting for a long period after their hospital stay. The condition is termed the "post intensive care syndrome" (PICS) and describes a state with wide range of symptoms as fatigue, depression, anxiety, memory loss as well as both cognitive and physical impairment. During the first five years after discharge, more than half of ICU survivors had suffered at least one episode of depression or anxiety