Calibration trial of an innovative medical device ( ) for the evaluation of pain in non-communicating patients in the intensive care unit.

Background: Pain management is an essential and complex issue for non-communicative patients undergoing sedation in the intensive care unit (ICU). The Behavioral Pain Scale (BPS), although not perfect for assessing behavioral pain, is the gold standard based partly on clinical facial expression. , an automatic pain assessment tool based on facial expressions in critically ill patients, is a much-needed innovative medical device.