Patients discharging the Intensive Care Unit (ICU) still need a high level of care because of the severity of their disease. In fact, they have an increased risk for readmission to the ICU. Moreover, urgent readmissions to the ICU are a widely used tool to assessment the quality of Health Care services. Although a lot of efforts are being made to reduce them, these adverse events still exist. It is noted that readmitted patients to the ICU have a much poorer prognosis, as its mortality rates are six times higher, and also have eleven times higher probability to die in hospital compared with other hospitalized patients.