Critical care medicine deals with life support or organ support for patients who are critically ill. A critical care physician diagnoses, treats, and supports patients who may be in an intensive care unit, or who may have multiple organ dysfunction. Patients who receive intensive care treatment are usually critically ill patients who are treated after major surgery and require intensive monitoring. The critical care or intensive care physician may also communicate with the patient’s primary physician, other specialists, and the critical care staff to coordinate treatment and care.