Intensive care units (ICUs) are unique locations in the hospital. Very few countries have set minimum criteria to qualify a unit as an ICU [1]. What is clear is that an ICU is not merely a place where specific procedures are performed. Patients can be mechanically ventilated in the post-anesthesia care unit; renal replacement therapy is a common practice in nephrology units; and vasopressors are routinely used in coronary care units. An intensive care unit is a specific entity with unique characteristics. It gathers people with different backgrounds (physicians, nurses, different therapists, clerks, etc.) working 24 h a day taking care of critically ill patients, and the care provided encompasses many aspects of medicine, including ethical concerns. As a consequence, working as a team with a shared culture of care is of paramount importance [2].A major concern regarding the open model of organization is that it is a model that is counter to this idea of a team approach, with different professionals coming from different backgrounds and more likely to have different goals without a shared culture. Why are we still "on the fence" regarding the importance of closed ICUs? Several aspects warrant discussion.1. Focusing on mortality for ICU patients is overly simplistic [3,4].Mortality rates can be influenced by numerous external factors and questions remain as to the best moment to assess mortality? Many factors besides quality of the care delivered impact mortality, mainly related to case mix, admission and discharge policies and hospital organization. A recently raised concern regarding measurement of mortality is the impact of end-of-life care preferences, and how they may alter the interpretation of mortality as an outcome [5]. Other outcomes are also a consideration such as length of stay, time of day patients are discharged, and long-term functional status and quality of life. To adequately interpret the existing literature, we must take into account the many potential confounders of patient characteristics, and the organization of ICUs and hospitals.
Understanding culture and communication is not straightforward.Traumatic, demanding and emotional events are frequent in the ICU. In this context, caregivers are at risk of developing stress and burnout symptoms [6]. However, they may better cope with these situations in the long term if they work in an environment that emphasizes trust and support [7]