The level of sedation measured by a scoring system must relate to clearly defined clinical levels of sedation and be useful for different sedative drugs. A monitoring procedure for clinical use must be simple, non-invasive, and require a minimum of time. Since critically ill patients are treated by many health professionals during their stay in the ICU, the monitoring system must possess good interoperator agreement. The monitored sedation level should be easy to record and read from the patient's chart; it should give a real-time estimate of the sedation and not add unnecessary costs.
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